Hello! I have Ubuntu on a virtual box. However, it's way too slow to do anything spectacular. I have this old Netbook that's designed for windows 7. Seen as how it doesn't have a CD slot to install Ubuntu on, I was thinking of putting the Ubuntu iso on a usb and installing it that way. I'd like to use Ubuntu to automate a ton of stuff that I do a lot. I'd also like to improve my security on my network, etc.. So, I have a few questions that I think are good to ask all on one question, instead of people having to search a lot for the answers they're looking for. (including myself)  Questions:   Would the netbook (designed for win7) be able to handle Ubuntu? Which Ubuntu OS should I use for a crappy netbook laptop? Which one would best suite a small HDD and 2GB~ of RAM? My netbook can barely handle win7, seen as it only has 2GB of RAM and a small HDD 2GB of ram isn't much, but will it work for Ubuntu as using it as a main OS? I have a desktop computer, how hard would all of this to be set up? I assume it'd be time consuming, but pretty basic to do. I have a virtualbox for Ubuntu right now, but its really slow. I allocated about 2.5ish GB of RAM, what's the recommended specs for the Ubuntu OS I should install? If I've missed anything, I'll add it to the list later. Thank you if you give me a reply. It is appreciated!   TL;DR what Ubuntu/Linux OS should I install on a crappy netbook for best performance   ~ Kayden 'iRaaptor' von Raaptor  EDIT: Netbook is an Acer Aspire One

For a given hardware configuration, how do I find out if Ubuntu will run on it? What considerations should I take into account when choosing an Ubuntu version and  such as:    with a lighter desktop than the usual Gnome and Unity  with the even lighter LXDE desktop   Obviously Ubuntu does not run on some processor architectures. So how do I go about choosing the right version and derivate. How can I find out the minmal system requirements?


It includes the command \newtheorem{teo}{Theorem}[section] in my code, but theorem 0.1 appears when I do \begin{teo}, how to change?

Suppose I define a new theorem "Theorem" and declare that its counter should be reset whenever the subsection counter is incremented or reset:  \newtheorem{theorem}{Theorem}[subsection]   At some point in my (article) document I start a new \section (say, section 2) without starting a \subsection. I expect the first theorem in this section to be numbered with "2.0.1" (which may be considered bad style). However, the theorem is numbered "2.0.2".  Is this "by design" (technically, I didn't start a new \subsection) or a bug? Moreover, what would be a proper workaround? (Such a workaround should not involve manually resetting the theorem counter, and it should work for whatever theorem type I may define in addition to "Theorem".)  \documentclass{article}  \newtheorem{theorem}{Theorem}[subsection]  \begin{document}  \section{bla}  \subsection{blubb}  \begin{theorem} Some text. \end{theorem}  \subsection{foo}  \begin{theorem} Some text. \end{theorem}  \section{bar}  \begin{theorem} Some text. \end{theorem}  \end{document}   EDIT: In response to Seamus' comment: The unexpected counter value also occurs with amsthm and ntheorem.


When I was a child I remember frequently hearing references to "oriental" people. Of course "oriental" now has a pejorative connotation, and generally "asian" is preferred.   However, I can't help but feel like "asian", even if it is a step forward socially, is a small step backward in specificity. Maybe it's just my perception of the word, but "oriental" seemed to have an implied reference to people of the far east, specifically to people with a collective set of similar physical features like epicanthic eye folds and straight black hair. A group that would include Chinese, Japanese, or Vietnamese, but would exclude Indians or Iranians (though "asian" is a valid term for all of these people).  The only other term that I've heard of that is conceptually close is "mongoloid", but it has more modern associations with down syndrome, and may be considered a pejorative in its own right.  Is there a modern, socially acceptable term to reach this specific designation of person that might have been referred to as "oriental" or "mongoloid" in the past?

I once posted an article on the web in which I referred collectively to people from China, Japan, and the Koreas as "Oriental". I got an email from someone who informed me that this is an offensive term and that I should call such people by the specific country of origin -- "Chinese" or whatever -- or collectively as "Asians". She claimed that "Oriental" refers to an object, like "an Oriental vase", and is insulting when applied to a person.  I consider "Asian" inappropriate as it would include Siberians, Afghans, Pakistanis, etc. And of course "Chinese" is unacceptable if you want to include Japanese, Koreans, and related cultures.  So my question is: Do people from this part of the world really find the word "Oriental" offensive? If so, what term do they prefer for themselves? I'd be particularly interested in hearing from someone who actually is of Japanese, Chinese, etc., background, rather than an American or European saying what he thinks someone else thinks.  (Frankly I thought the argument about "Oriental" applying to an object was a little curious. I call myself an "American". I don't find it at all offensive that the same word used to describe me as a human being is also used to describe objects, like "American cars", "American food", etc. Both people and objects can be from the same physical place, so I don't see any problem with using the same adjective to describe both. But maybe there are different connotations to the word "Oriental". )


We have seen the Newton disc, when it is rotated it produces white color. So I want to know whether white exists as a single color or is that a combination of multiple colors?

If you go to any course about photography, you learn that all colors are made up of the colors red, green and blue (RGB). (If you mix red, green and blue light, you will get white light, or any other color according to how much of each light color you use.)  If you ask a physicist, he or she will tell you that the visible light is made up of all the colors in the rainbow. The water splits the white light and shows the rainbow with all the different colors it contains.  What is color, and what is it made of? Are all the colors in the rainbow really basic colors, and photographers have just experienced that you can reproduce all those colors with red, green and blue? What is the commonly accepted idea about colors?


If I have  in play, and my opponent targets it with , am I not allowed to bounce the Fleeting Image in response, since making Urza's Rage fizzle technically counters it?

I cast , sacrificing my only creature to kill my opponent.  My opponent responds with , which will win the game the other way.  Last Word says "This spell can't be countered."  What else can I do about it besides countering it to prevent my plans from being foiled?  (I'd really like to have the last word here.)    Historic Note: before of the April 2018 rules change, uncounterable spells with targets used to actually have different wording (still visible on the printed cards) implying that they still could be countered.  For example, Last Word said:     Last Word can't be countered by spells or abilities.   Meanwhile Akroma, Angel of Fury said:     Akroma, Angel of Fury can't be countered.


I am running Ubuntu 15.04 on a Dell XPS 13 from 2013. Since 13.04 I sometimes get accidental middle clicks/middle click emulation. I can tell this is happening because text in my clipboard pastes itself (default behaviour on Ubuntu) at random times.  Can anyone tell me why this is happening and how I can disable it?

So I tried looking through the various other questions but they mostly focus on disabling the middle mouse paste.  Basically the middle mouse button on my Logitech G500s is broken, and it keeps "clicking" randomly so it's screwing up any chance of doing work.  Is there any way to disable it? Or map it to nothing?  Thanks and sorry if this is a duplicate.  xinput list output:  ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜   ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜   ↳ Turtle Beach Turtle Beach PX3 (XBOX) id=8 [slave pointer (2)] ⎜   ↳ Logitech G500s Laser Gaming Mouse id=9 [slave pointer (2)] ⎜   ↳ Logitech G500s Laser Gaming Mouse id=10 [slave pointer (2)] ⎜   ↳ Razer Razer DeathStalker id=12 [slave pointer (2)] ⎜   ↳ Razer Razer DeathStalker id=13 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)]     ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]     ↳ Power Button id=6 [slave keyboard (3)]     ↳ Power Button id=7 [slave keyboard (3)]     ↳ Razer Razer DeathStalker id=11 [slave keyboard (3)]


I suspect my system hard drive to get old.  Before losing anything, I want to create a full clone (all partitions, all data, exact clone) to another drive. So I can then simply replace the old hardware with the new one.  I think I may boot on a USB media to clone my HDD while it's not in use, so can I use a Linux tool? Is "dd" capable of that operation for a Windows drive (including boot information)?

I'm upgrading my Windows 7 laptop to a new hard drive.  How can I clone or image the old hard drive over to the new hard drive, so that it looks like nothing has changed (other than the new hard drive) to my operating system and applications?  Can I use what is built into Windows 7 Backup or should I use something else?


If the triangle ABC has sides $a,b,c$ opposite to the vertices A,B,C respectively and $\Delta$ is the area.The expression $\frac{1}{\Delta}\sqrt{abc(a+b+c)}$ is   $(A)\leq16\hspace{1 cm}(B)\geq16\hspace{1 cm}(C)\leq4\hspace{1 cm}(D)\geq4$  Using Herons formula, $\Delta=\sqrt{s(s-a)(s-b)(s-c)}$ and $s=\frac{a+b+c}{2}$, given expression reduces to  $4\sqrt{\frac{abc}{(a+b-c)(b+c-a)(a+c-b)}}$ and I could not solve further to find the answer. Please help....

If $\triangle$ be the area of $\triangle ABC$ with side lengths $a,b,c$. Then show that $\displaystyle \triangle\leq \frac{1}{4}\sqrt{(a+b+c)\cdot abc}$   and also show that equality hold if $a=b=c$.  $\bf{My\; Try}::$ Here we have to prove $4\triangle\leq \sqrt{(a+b+c)\cdot abc}$  Using the formula $$\triangle = \sqrt{s(s-a)(s-b)(s-c)},$$ where $$2s=(a+b+c)$$  So $$4\triangle = \sqrt{2s(2s-2a)(2s-2b)(2s-2c)}=\sqrt{(a+b+c)\cdot(b+c-a)\cdot(c+a-b)\cdot(a+b-c)}$$  Now using $\bf{A.M\geq G.M}$ for $(b+c-a)\;,(c+a-b)\;,(a+b-c)>0$  $$\displaystyle \frac{(b+c-a)+(c+a-b)+(a+b-c)}{3}\geq \sqrt[3]{(b+c-a)\cdot(c+a-b)\cdot(a+b-c)}$$  So we get $\displaystyle (a+b+c)\geq 3\sqrt[3]{(b+c-a)\cdot(c+a-b)\cdot(a+b-c)}$  But I did not understand how can I prove above inequality  help Required  Thanks


In Minecraft 1.10, I have a string of commands as a floor crafting setup, but I want to be able to have these multiple command blocks be placed into a world with a single command. Is this possible?

I am looking to try and set multiple commands in a single command block, but so far everything I have tried just returns "Unknown Command".  What is the format for writing multiple commands in a single command block in Minecraft 1.8?  Can I use either of the following:  Command:(command here) Command:(command here)     /command here; /command here;   Or is there another format?


How to evaluate the integral of   $$\int_0^{\pi/2}\frac{x\sin x\cos x}{(a^2 \cos^2 x+b^2 \sin^2 x)^2}dx$$

Please help me to find the integral of   $$\int \frac{x \sin{x} \cos{x}}{(a^2 \sin^2 x + b^2 \cos^2 x)^2} dx $$  There is a problem in having  x in the numerator. Please guide me . Thanks in advance.


I am developing client side of web application. In this application, there are tons of tabs, divisions, and other html elements. I would like to separate those elements as classified file like tab1_elements.html, tab2_elements.html and want to include those to main page.  sample code

          ...     ...
  ... ...   I googled a bit and noticed that html5 import attribute is just what I am looking for. However, I believe that attribute still not available yet for most browsers.   And I know it will take time to brwosers adapt that attribute. (maybe not adapt at all in worst case). So I am considering including iframe to main page. From what I heard, iframe was almost deprecated by w3c for security reasons and other issues. I wonder what are cons of iframe element and why developers tend to avoid this tag.   Is using iframe a bad idea?  I already tried ajax way to load external html files but chrome browser does not allow ajax communication for local files (application should run ok in off line mode). Can you guys suggest any alternative solutions?  Thank you for reading my post.

Somewhere along the line I picked up the notion that using iframes is 'bad practice'.   Is this true? What are the pros/cons of using them?


I am working a small program which can receive several commands. Each of these commands should cause different methods to run. I was thinking that if there were a way to put all the methods into a HashMap and invoke them directly by getting the value paired with the command Key instead of using if statements, it could make things much simpler but as far as I understand this is not possible since methods aren't treated as objects in Java. Still, it will be educative to find out if there is a way to do this.

If I have two variables:  Object obj; String methodName = "getName";   Without knowing the class of obj, how can I call the method identified by methodName on it?  The method being called has no parameters, and a String return value. It's a getter for a Java bean.


import java.util.Scanner; public class theatre_square {     public static void main(String args[])     {         Scanner in = new Scanner(System.in);         long m = in.nextLong(), n = in.nextLong(), s = in.nextLong();         theatre_square ob = new theatre_square();         long x = ob.cal(m,s), y = ob.cal(n,s);         System.out.println(x*y);     }     long cal(long a, long b)     {         if(a<=0)             return(0);         else             return (1+cal(a-b,b));     } }   Input: 1000000000 1000000000 1 Error: Exception in thread "main" java.lang.StackOverflowError   at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)    at theatre_square.cal(theatre_square.java:17)....... and so on. I think it has to do something with the return statement inside in the recursion function.

What is a StackOverflowError, what causes it, and how should I deal with them?


What does "@" mean before a string?  I saw this notation with paths:  string myfolder = @"C:\Users\";   But also with normal strings.

This is a .NET question for C# (or possibly VB.net), but I am trying to figure out what's the difference between the following declarations:  string hello = "hello";   vs.   string hello_alias = @"hello";   Printing out on the console makes no difference, the length properties are the same.


I am trying to open and read a hyperspectral image using GDAL like below.  So after reading the data like this :  data = gdal.Open( filename )   then I can see the x, y, dim information of the dataset :  x = data.RasterXSize y = data.RasterYSize dim = data.RasterCount   Now the question is that if there is any way to find out that each band wavelength from image.? I have the following data image: sub_66 Type:File sub_66 Type:hdr sub_66 Type:aux(xml) This data file is of AVIRIS(Hyperspectral Data) sensor.

I'm trying to identify null/0 values in each of my raster bands. How can I loop through all the values of each band? I've tried this code, straight from the gdal/python cookbook website but this just gives stats for each band as a whole and for some reason it actually doesn't print a minimum value of 0 even though my raster does have 0 values, it shows a minimum value of 1.   I want to print every single cell value. Is there a way to do this?   from osgeo import gdal import sys  src_ds = gdal.Open( "INPUT.tif" )  print "[ RASTER BAND COUNT ]: ", src_ds.RasterCount for band in range( src_ds.RasterCount ):     band += 1     print "[ GETTING BAND ]: ", band     srcband = src_ds.GetRasterBand(band)      stats = srcband.GetStatistics( True, True )      print "[ STATS ] =  Minimum=%.3f, Maximum=%.3f, Mean=%.3f, StdDev=%.3f" % ( \             stats[0], stats[1], stats[2], stats[3] )


Why do graph degree sequences always have at least one number repeated?    $(1, 2, 2, 3)$ = Valid, as you can see, because the $2$ is repeated. $(1, 2, 3)$ = Not possible to construct a graph with because all numbers are unique.    I know that the graph degree sum must be even, but in this case, both are even.  Our professor said it had to do with Combinatorics, but we never touched that topic.  EDIT: Loops are not allowed.

Any help would be appreciated.  If $n$ is a natural number $\ge 2$ how do I prove that any graph with $n$ vertices has at least two vertices of the same degree?


i have created a simple html survey form under cloudpages which constains several questions with radio buttons and some with text boxes for answers. I want to know how to get radio button's values selected by user along with text in textboxes to a data extension.  Is it something which can be done through SSJS or AMpscript? I was trying to use this script in html form          This is the page for    I would also like to know how to capture the email address of subscriber who filled the survey as I haven't included any email address field in this form.  Updated ampscript          %%[ var @q5_overallHow5, @q6_didOur6, @q8_wouldYou8, @q10_whatAspect10, @q11_whatAspect, @q12_pleaseExplain, @q15_additionalComments15  set @q5_overallHow5 = RequestParameter('q5_overallHow5') set @q6_didOur6 = RequestParameter('q6_didOur6') set @q8_wouldYou8 = RequestParameter('q8_wouldYou8') set @q10_whatAspect10 = RequestParameter('q10_whatAspect10') set @q11_whatAspect = RequestParameter('q11_whatAspect') set @q12_pleaseExplain = RequestParameter('q12_pleaseExplain') set @q15_additionalComments15 = RequestParameter('q15_additionalComments15')  InsertData("SurveyResults",            "q5_overallHow5",@q5_overallHow5,            "q6_didOur6",@q6_didOur6,            "q8_wouldYou8", @q8_wouldYou8,             "q10_whatAspect10", @q10_whatAspect10,             "q11_whatAspect", @q11_whatAspect,             "q12_pleaseExplain" @q12_pleaseExplain,             "q15_additionalComments15", @q15_additionalComments15           ) ]%%
Thank you

Thank you for completing the survey.

I created a landing page which auto-populates first name, last name and the email. Now I need to pass these 3 along with what radio buttons are selected by the user to a data extension other than the sent one.   I guess is something to do with the submit button for the radio buttons form but how? I have to tell somehow which data extension and what fields/values to add but I don't know how.  Is there any easy way to do that?  Thanks, VD


Let $F \subset K$ be finite fields with $[K:F] = 3$. Show that if $\alpha \in F$ is not a square in $F$, it is not a square in $K$.  My attempt:  $[K:F] = 3 \implies \forall x \in K$, $x = \beta_1a_1 + \beta_2a_2+\beta_3a_3$, where $\beta_1, \beta_2, \beta_3 \in F$ are basis for K. So if $\alpha \in F$ not a square then $x^2-\alpha = 0$  has no solution in F. So then we have to show that $(\beta_1a_1 + \beta_2a_2+\beta_3a_3)^2 - \alpha = 0$ also has no solutions.  I am not sure if I am even headed in the correct direction. Any help is appreciated.

Let $A,K$ be finite fields with $K\supset A$. If $[K:A]=3$, I would like clarification as to why, if $x$ is not a square in $A$, then $x$ is not a square in $K$. My notes just mention this fact, but without proof.


the seller showed me all the scratches at the bike and told that they happened when he was carrying bike and & changing rear wheel all the time. I did not notice any other scratches at the frame. All of these are around rear wheel hub. Are they something to worry? Paint or just structural scratches?

Intended as a canonical answer to the many questions we have about damage to carbon parts. It is well known that carbon fiber parts can be damaged and fail, and carbon parts can be fragile when stressed in certain ways, but we get a large number of questions on this site asking if a carbon part (Frame, rim, stem) with damage is a concern or not.  Many of these parts are obviously suffering no more than a minor cosmetic blemish, and very few are suffering from clearly significant damage. Most fall into the gap between where physical inspection is required to make an assessment.


$$\lim_{y\rightarrow x}\frac{\sin(y)-\sin(x)}{y-x}$$  Is there any cool trig identity I could use to solve this? We don't have L’Hospital yet, so I have to calculate it otherwise. I tried solving this using the series expansion of sine:  $$\cdots =\lim_{y\rightarrow x}\frac{\left(\sum_{k=0}^\infty (-1)^k \dfrac{y^{2k+1}}{(2k+1)!}\right) -\left(\sum_{k=0}^\infty (-1)^k \dfrac{x^{2k+1}}{(2k+1)!}\right)}{y-x}$$  But what now? With L’Hospital I get $\cos(x)$ as a solution. Differentiation isn't allowed either.

Given the fact that  $$\lim_{h\to 0} \frac{\sin(h)}{h}=1,$$ compute the following limit:  $$\lim_{h\to 0}\frac{\sin(x+h) - \sin(x)}{h}\ $$  How would I go about solving this problem? I have attempted to use trig identities (addition of angles) to try to simplify the problem, but it only seemed to make it worse...


Help on getting started with this exercise    Another approach to the curvature of a unit-speed plane curve $\gamma$ at a point $\gamma(s_0)$ is to look for the `best approximating circle' at this point. We can then define the curvature of $\gamma$ to be the reciprocal of the radius of this circle.  Carry out this programme by showing that the centre of the circle which passes through three nearby points $\gamma(s_0)$ and $\gamma(s_0 \pm \delta s)$ on $\gamma$ approaches the point $$\boldsymbol \epsilon(s_0) = \gamma(s_0) + \frac{1}{\kappa_s(s_0)} \mathbf n_s(s_0)$$ as $\delta$s tends to zero. The circle $\mathcal C$ with centre $\epsilon(s_0)$ passing through $\gamma(s_0)$ is called the osculating circle to $\gamma$ at the point $\gamma(s_0)$, and $\boldsymbol \epsilon(s_0)$ is called the centre of curvature of $\gamma$ at $\gamma(s_0)$. The radius of $\mathcal C$ is $1/|\kappa_s(s_0)| = 1/\kappa(s_0)$, where $\kappa$ is the curvature of $\gamma$ $-$ this is called the radius of curvature of $\gamma$ at $\gamma(s_0)$.

Another approach to the curvature of a unit-speed plane curve $\gamma$ at a point $\gamma (s_0)$ is to look for the ‘best approximating circle’ at this point. We can then define the curvature of $\gamma$ to be the reciprocal of the radius of this circle. Carry out this programme by showing that the centre of the circle which passes through three nearby points $\gamma (s_0)$ and $\gamma (s_0 \pm \delta_s)$ on $\gamma$ approaches the point $$\epsilon (s_0) = \gamma (s_0) + \frac{1}{\kappa_s (s_0)}n_s(s_0)$$ as $\delta_s$ tends to zero. The circle $C$ with centre $\epsilon (s_0)$ passing through $\gamma (s_0)$ is called the osculating circle to $\gamma$ at the point $\gamma (s_0)$, and $\epsilon (s_0)$ is called the centre of curvature of $\gamma$ at $\gamma (s_0)$. The radius of $C$ is $\frac{1}{|\kappa_s (s_0)|} = \frac{1}{\kappa (s_0)}$, where $\kappa$ is the curvature of $\gamma$– this is called the radius of curvature of $\gamma$ at $\gamma (s_0)$.     I have done the following:  The three points $\gamma (s_0), \gamma (s_0 + \delta_s), \gamma (s_0 - \delta_s)$ are on the circle with radius $r$ and centre $\epsilon$.  So $$r^2=\|\gamma (s_0)-\epsilon\|^2=\|\gamma (s_0 + \delta_s)-\epsilon\|^2=\|\gamma (s_0 - \delta_s)-\epsilon\|^2$$   Since we want show that the centre of the circle tends to $\epsilon (s_0)$ we do the following:   \begin{align} |\epsilon (s_0)-\epsilon| &=|\gamma (s_0) + \frac{1}{\kappa_s (s_0)}n_s(s_0)-\epsilon| \\ &\leq | \gamma (s_0) -\epsilon|+\frac{1}{|\kappa_s (s_0)|}|n_s(s_0)| \\ &=r+\frac{1}{|\kappa_s (s_0)|}|n_s(s_0)|. \end{align}   Is this correct so far? How could we continue?  EDIT:   We have that the radius of $C$ is $\frac{1}{|\kappa_s (s_0)|}$ so we get  \begin{align} |\epsilon (s_0)-\epsilon| &=|\gamma (s_0) + \frac{1}{\kappa_s (s_0)}n_s(s_0)-\epsilon| \\ &\leq | \gamma (s_0) -\epsilon|+\frac{1}{|\kappa_s (s_0)|}|n_s(s_0)| \\ &=r+\frac{1}{|\kappa_s (s_0)|}|n_s(s_0)| \\ &=\frac{1}{|\kappa_s (s_0)|}+\frac{1}{|\kappa_s (s_0)|}|n_s(s_0)| \\ &=\frac{1}{|\kappa_s (s_0)|}(1+|n_s(s_0)|) \\ &=\frac{1}{|\kappa (s_0)|}(1+|n_s(s_0)|). \end{align}   What do we get from that?


The  allows to add non-Google email provides (via POP and IMAP).  Is it mentioned somewhere that the emails pulled from these providers stay on the device and are not stored/shared with Google?  Note: I have marked my own question as duplicate (and not deleted it) because there is another one which is strikingly similar, but the answer is purely speculative.

I need to set up my business email*(non gmail email)* on the mobile devices (Nexus 5 and Nexus7). The business has its own private mail server. The way I can do it is by using Gmail app on these devices. The question I have is does Gmail app on the mobile devices store the IMAP emails(non gmail emails) on the gmail servers? Or Gmail app is just a client and does not bother storing the IMAP emails(non gmail emails) on its servers that are not gmail emails? Thanks for the insight...


I'm trying to place a sign that places a command block in itself for some effects, but trying to activate the command block, I get the error:  Data tag parsing failed: Expected '}' but got 'H' at: ...1,CustomNameVisible:1,CustomName:"H<--[HERE]   Command:  /setblock ~ ~ ~ minecraft:standing_sign 0 replace {Text1: "{\"text\":\"right click\"}",Text2: "{\"text\":\"\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"setblock ~ ~ ~ command_block 0 replace {Command:/summon armor_stand ~ ~ ~ {Unbreaking:1,Invisible:1,Invulnerable:1,NoGravity:1,Marker:1,CustomNameVisible:1,CustomName:"Hi"}}\"}}"}   Any help? I tried adding \" and such, but it didn't help. Note, I'm in 1.12.1  Thanks in advance!

I am trying to lock some boxes in a map of mine, and I used this command:   /blockdata 10 4 9 {Lock:Elyiana's Mage Key}   At first it worked, but then when I logged back on the next day it gave me this error message:    Data tag parsing failed: Expected '}' but ''' at: {Lock:Elyiana'<--[HERE]     I don't know why it doesn't like the apostrophe in the key's name. I would change it, but it already worked and locked some other items. My version is 1.12, does anyone have an answer to my problem?


For the last few years i've always written the following sentence with for:     ... the value for the thing.   But now I've been writing a lot of documentation and I've started wondering if I should use of or for in this case.  the sentences i'm writing are like this:     Gets or sets the configuration for a specific port.    Gets or sets the current state of the access provider for a specific port.   so my question: Is 'for' in this case the correct word to use or should it be:     Gets or sets the configuration of a specific port.    Gets or sets the current state of the access provider of a specific port.

I am always confused by the difference between the use of for and of in cases like these:        Principal component analysis of microarray data.   Principal component analysis for microarray data.      Which of these is correct? Is it OK to use both? If yes, when should I use 1. and 2., respectively?


What will be the value of this hand?  2, 9, A, 4, A   May it be 17? Or it must be 27?  In this situation can every Ace count as 1, or there must be one Ace as 11?

I understand that Aces are worth either 1 Point or 11 Points, depending on the player's will. But how are multiple Aces valued? Here are some examples:  Ace, Nine, Ace Is this always x+9+x, where: Case 1: x = 1 or x = 11; (This hand would always be 11 or 31) Or can this be x+10+y, where: Case 2: x = 1 or x = 11; y = 1 or y = 11 (This hand can be 11, 21, 21 or 31)


Given there are 10 RV distributed by $U[0,\theta]$ ($\theta$ supposed to be uknown).I know sample mean ($\bar{X_{10}}$) of and sample variance ($\hat{s_{10}}$), can I found 95% CI for mean? My answer was correct, yes we can. But I assumed that we can use t-distribution for this, becase sample mean has normal distribution (by CLT) but we have small amount of sample (n=10), hence we use t-distribution. But it seems to be wrong, we can't use t-distribution to find CI in this case. Why can't we use t-distribution to find CI in this case? Because $X_i$ is not normally distributed? I want to understand why t-distribution is not applicable here, given that I know sample mean and variance? Thanks in advance. PS: The correct deriviation of CI  is a little bit complicated and uses Irwin-Hall distribution.

I've been trying to compute a 95% confidence interval for the mean of a height sample, which is uniformly distributed. I have calculated the following sample statistics: $$n=10 \quad \quad \bar{x} = 73.55 \quad \quad s = 1.68 \quad \quad s^2 = 2.83.$$ How can I calculate the CI of the mean of a uniform distribution not knowing the limits of the distribution?  I only know the CI for the normal distribution. Thanks in advance.


I want to install 13.04 (or higher) using wubi, is that possible?

Is it possible to use Wubi for Ubuntu 13.04? I read that it will not be supported in the official release due to some problems. Is this going to change in the future, and can we expect to see a future release with support for 13.04?


$\lim_{x\to0}\frac{\sin x - x}{x^3}$  I know it can be easily done by using Taylor expansion of sine function and L'Hopital. However, can we come up with a way to solve the limits using properties.

I'm trying to solve this limit     $$\lim_{x\to 0} \frac{\sin x-x}{x^3}$$   Solving using L'hopital rule, we have:  $$\lim_{x\to 0} \frac{\sin x-x}{x^3}= \lim_{x\to 0} \frac{\cos x-1}{3x^2}=\lim_{x\to 0} \frac{-\sin x}{6x}=\lim_{x\to 0} \frac{-\cos x}{6}=-\frac{1}{6}.$$  Am I right?  I'm trying to solve this using change of variables, I need help.  Thanks  EDIT  I didn't understand the answer and the commentaries, I'm looking for an answer using change of variables.


I was just reading the wikipedia page on the  when I noticed the second sentence seemed somehow wrong to my ears. Uses just seems wrong here.      It originally was designed for audio files, such as MP3, but various software now uses it to play video file lists.   But then I thought about what the correct alternative would be and I came up with:     It originally was designed for audio files, such as MP3, but various software now use it to play video file lists.        It originally was designed for audio files, such as MP3, but various softwares now use it to play video file lists.   Both these sentences again sound wrong to my ears trained by almost 22 years of listening to English now. The only good alternative I could come up was to avoid this issue altogether is this:      It originally was designed for audio files, such as MP3, but various software media managers now use it to play video file lists.   The issue, I think, boils down to whether softwares is a correct plural form for software.

Is it correct to use softwares, as in the following sentence?  There are various video conversion softwares in the market.


IN order to display from line 1 million, for 20 lines, I ended up with   head -1000020 myfile | tail - 20    That works and I’ve wrapped in a function that does arithmetic for it.  But I was wondering if there’s an existing bash or unix command for it.   Am on macOs, but happy knowing Linux for it too.

I have a ~23000 line SQL dump containing several databases worth of data. I need to extract a certain section of this file (i.e. the data for a single database) and place it in a new file. I know both the start and end line numbers of the data that I want.  Does anyone know a Unix command (or series of commands) to extract all lines from a file between say line 16224 and 16482 and then redirect them into a new file?


i am new to ubuntu.. I had ubuntu 14.04 installed and today i want to upgrade it to ubuntu 14.10.  Is it safe to upgrade? P.S. I have faced many problems during past days on ubuntu upgrades :(

What are the different ways I can use to upgrade Ubuntu from one release to another?


I am trying to get into UNIX. I want to replace and -, ?, :, /, & to become %5f, %3f %3a, %2f, %26, %20 (these are the hexadecimal digits corresponding to the ASCII code).  I am also trying to make any lower case characters become upper case and vice versa, e.g. the rock to become THE ROCK and THE ROCK to become the rock.  I am trying to do this all using standard UNIX utilities commands using a script, ideally all on one line.  So far I have got  tr A-Z a-z   but not sure how to make the ? and the other ones spit out the corresponding hex #s.

I am trying to write a bash script for testing that takes a parameter and sends it through curl to web site.  I need to url encode the value to make sure that special characters are processed properly.  What is the best way to do this?    Here is my basic script so far:  #!/bin/bash host=${1:?'bad host'} value=$2 shift shift curl -v -d "param=${value}" http://${host}/somepath $@


I'm having trouble mapping UV coordinates to vertices in OpenGL. I'm binding my buffers and enabling all of my attrib arrays perfectly well and things are rendering - but what I'm stuck on is how to map UV and Normal data.  You can't just store UV and Normal data with the Vertex data, because obviously you'll be re-using vertices, but not necessarily with the same Normal or UV.  For clarity this is the general flow of what I'm doing at the moment:   I bind my shader program. I bind my vertex array buffer with GL.BindBuffer I Bind my element buffer with GL.BindBuffer I use GL.Uniform (1, 2, 3 or 4) to bind values to my uniform variables I enable all of my vertex buffer attributes with GL.EnableVertexAttribArrau and then encode their layout using GL.VertexAttribPointer I draw using GL.DrawElements I disable all of my vertex attrib arrays again   I'm totally stuck on how to encode UV and Normal data to my vertex attributes. Do I need to use a second buffer? If so; how does OpenGL know to use a different set of indices to find them? I'm totally lost and any help would be greatly appreciated.

After parsing collada files I found out that we have to load two(or more) indices each pointing to say a vertex or normal etc. like this (
3 0 2 0 0 0
)  Is there a way to load (and use)these indices to indices buffer(ELEMENT_ARRAY_BUFFER) like this (vnvnvn...) ; where v is vertex pointer, n is normal pointer from the above. with vertices loaded to VBO1 like (vvvv...) and in VBO2 like (nnnn...). So that we dont have to repeat the normals in VBO2.  VBO like (vnvnvn...) is also ok. (and not something like this ), I'm not trying to use multiple indices buffer. I'm trying to put all the given indices into one index buffer and use them alternately.  (If I wasnt clear i will try for more clarification.)


I have read several posts on StackOverflow regarding difference between " " and <> with #include, use of angular brackets in type casting etc. My question is that what does angular brackets tell the compiler? Or do they have different meaning in different contexts? I am curious about it because I was asked this question in a quiz recently, but it was not clear about how to answer this question.

In the C and C++ programming languages, what is the difference between using angle brackets and using quotes in an include statement, as follows?   #include <filename>  #include "filename"


I want to know if the following sentence is grammatically correct: "John's largest tomato and largest pumpkin outweighed Bill's by 2 and 17 pounds, respectively."  I am trying to say "John's largest tomato outweighs Bill's largest tomato by 2 pounds and his largest pumpkin outweighs Bill's by 17 pounds."    Thanks

C# Textreader and TextWriter are the another way to read and write file respectively...      I added a text box and button I called tbUpdate and btUpdate respectively...      In the right hand column, we’ll use three TextBlocks; the first and third as fixed labels (with the values Likeability: and % respectively)...      WorkerSupportsProgress and WorkerSupportsCancellation which hold true/false values that let the backgroundworker report progress or cancel an async progress respectively...   While learning many the many different aspects of development, I have not come across a book or series where the word respectively is not used in explaining an example. Honestly I guess it's implied that we know what it means. To me I always kind of skim over it because I can usually figure out what they're saying through the surrounding context. Can anyone explain this?


I wanted to ask a question about Hibernate and polymorphism, and before asking it I searched on Google, and lo and behold, there was already . It's three weeks old and has never really been answered. What's the most appropriate way to "bump" it up to being higher up in the "active" list? I don't have an answer to it myself, and I'm not the OP so I don't want to edit the original post. And SO etiquette says I shouldn't ask a duplicate question. What should I do?

I asked a question almost as soon as I got my account. I got a few decent answers, but none of them helped solve my problem. The question has long since become buried by newer questions, and there's still no accepted answer. Unfortunately, because there are quite a few answers with votes, to a casual observer it probably looks like the question was answered and I just neglected to mark an answer as accepted, and the system does not consider it "unanswered".  Or, I asked a question that was a bit more difficult to answer. After waiting for some time, I received no answers, little or no comments, and only a few views. The question does show up in the "unanswered" list, but no one has answered my question.  In either case, what's the protocol for me to try to get this question answered?  I see several options:   Post the question a second time, possibly linking to the original, to get attention for the original question. This is encouraged on sites like Reddit.  However, it's probably not appropriate here, since we're encouraged to check for duplicates and not submit a question that's already been asked by someone else, so this probably falls under that heading. Wait for some kind of wiki-like talk page to be implemented, then post a plea on the talk page for input and hope that activity on the talk page bumps up the question. Edit the question, but do nothing further on the Stack Exchange site. If I edit my post to say that I haven't accepted any of the current answers but am looking for more, then the question might get answered eventually by people browsing through old questions to find something they can answer. Post the question on other sites, but link to my original question on Stack Exchange. People will either answer here, or they'll answer on the other site and I can post the accepted answer here myself.  This might be considered spamming, so it might be better to do this without the link.      For more information, see the "" page in the .


The values of $$I=\int_{0}^{1} {x^4} ({1-x})^4\dfrac1{1+x^2}dx$$ My Failed Attempt   I tried applying F(x)  =F(a+b-x)  in hopes the denominator will cancel out but it's not. I tried to further simplify the expression but with no luck   $$I=\int_{0}^{1} {x^4} ({1-x})^4\dfrac1{1+({1-x})^2}dx$$  Adding both integral isn't helping me much

The question I am working on: Evaluate   $$\frac{1}{2} \int^1_0{x^4 (1-x)^4 } dx \le \int^1_0{\frac{x^4 (1-x)^4}{1+x^2}} dx \le \int^1_0{x^4 (1-x)^4 } dx$$  So using integration by parts to solve:   (letting $u=(1-x)^4$ and $dv=x^4$)  $$\int{x^4 (1-x)^ 4} dx = \frac{4}{5}x^5(x-1) - \frac{4}{5}\left(\frac{x^7}{7} - \frac{x^6}{6}\right)+c$$  Is it correct so far? If so ...   $$\int^1_0{ x^4 (1-x)^4 } dx = \frac{4}{5}\left(\frac{1}{6}-\frac{1}{7}\right)=\frac2{105}$$  $$\frac{1}{2} \int^1_0{ x^4 (1-x)^4 } dx = \frac{2}{5}\left(\frac{1}{6}-\frac{1}{7}\right)=\frac1{105}$$  But   $$\int\frac{{x^4(1-x)^4}}{1+x^2} dx = ??$$    Since I found $\int{{x^4(1-x)^4}} dx$. I thought of integration by parts, letting $u=\frac{1}{1+x^2}$, $dv = x^4(1-x)^4$. But I will get a very complicated $v$ to integrate later? Same if I did it the other way around?


Solution Attempt  As $A \subseteq A \cup B$ we have $Int(A) \subseteq A \subseteq A \cup B$  Similarly, $Int(B) \subseteq A \cup B$  $\implies Int(A) \cup int(B) \subseteq A \cup B$  Now $Int(A) \cup Int(B)$ is an open subset of $A \cup B$. As $Int(A \cup B)$ is the union of all open subsets of $A \cup B$ we have that $Int(A) \cup Int(B) \subseteq Int(A \cup B)$

I know that $\operatorname{Int}(A) \cup \operatorname{Int}(B) \subset \operatorname{Int}(A \cup B)$, but that the other direction does not hold, so can anybody please tell me whats wrong with the following proof?   Suppose $x \in \operatorname{Int}(A \cup B) \Rightarrow \exists \epsilon > 0 : K(x, \epsilon) \subset A \cup B$. Assume without loss of generatlity that $K(x,\epsilon) \subset A-B \Rightarrow x \in \operatorname{Int}(A) \Rightarrow x \in \operatorname{Int}(A) \cup \operatorname{Int}(B)$.


This question came just out of curiosity to know our friend the Stack Trace a little better.  As a C# (.NET) developer every one must have seen a yellow stack trace like the one below.    Most of the things in it are easily understood like the message Attempt to divide by zero and the method where it occur Page_Load even the path of the .cs file also. But after 3 years of experience the thing I still don't know is what those numbers with + sign at the end of methods denote in here, like +51, +92, +54 and +772.  Does anybody know what these are?

When reading a stack trace like:  [FormatException: Input string was not in a correct format.]    System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2755599    System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +112    System.Convert.ToInt32(String value) +68   What do the +68, +112, etc. numbers mean. I'm guessing that they're offsets to something. If so, what?


I was looking for a book to complement the lecture notes of the course for a more intuitive approach to the subject and full of examples (mathematical), because the handouts seem only a bunch of mathematical definitions. I've read the suggested books in the question , but that's not what I'm looking for. In fact, they either deal with a few subjects, or have too physical examples. I was looking for more geometric examples. The program of our course (the third year physics study) is this:   Groups and axioms:   Axioms of the group. Finished and infinite group. Examples. SN groups. Continuous and discreet group.  Abelian and non-Abelian group. Unchanged subgroups and subgroups.  Isomorphism and homomorphism between groups. Simple and semi-simple groups.   Lie groups and Lie algebra:   Lie groups and Lie algebra. Structure constant. Examples.   Representation theory:   Representation of the group. Irreducible representations. Schur's lemma. Characters.   Basic group / groups of homotopies:   Fundamental group and groups of general homotopies. Exact succession.   SU Group (2), SO (3) and SU (3):   Groups and algebra of SU (2), SO (3) and SU (3). Isospin. Spin and rotations in R3. Wigner-Eckart theorem.  Tableaux of Young   Representations of the SO group (4), of the Lorentz SO group (3.1)   and Poincaré: Group and algebra of SO (4). Vectors of Lenz and hydrogen atom. Lorentz Group.   Roots and weights; Dynkin diagrams:   Vectors of roots and weights. Dynkin diagrams and the classification of compact groups.

I am looking for a good source on group theory aimed at physicists. I'd prefer one with a good general introduction to group theory, not just focusing on Lie groups or crystal groups but one that covers "all" the basics, and then, in addition, talks about the specific subjects of group theory relevant to physicists, i.e. also some stuff on representations etc.  Is Wigner's text a good way to start? I guess it's a "classic", but I fear that its notation might be a bit outdated?


How should I transform this sentence into a question?  Jane has just broken her leg.  How do I form a question from that sentence so that it starts with who and whose answer is Jane?  Q: Who__________? A: Jane.  Is it all right to ask it this way:  Who has just broken his or her leg?

Is there a pronoun I can use as a gender-neutral pronoun when referring back to a singular noun phrase?  Each student should save his questions until the end. Each student should save her questions until the end.


I imported an svg of text to blender and converted the text to mesh. After extruding it, it does something funny to the tex (holes in the text). Can anyone help me to extrude it smoothly?

I am sure this has been discussed quite a few times, but I found a tutorial recently doing the exact same thing as I did, but in my case my logo is messing up!  Here is the link to the workflow:   This is what it looks like after adding the solidify modifier:   I already recalced the normals of my spline, but besides that it messes up my spline shape, it had no effect.  Any suggestions on how to fix it?


I want to achieve the following scenarios:   Connect to remote machine via SSH Run command on remote machine - that usually takes 3 days to complete and shows output while working Leave the SSH connection without killing that command terminal process Connect to remote machine from other machine and see the running output of command.

Let's say I launch a bunch of processes from a ssh session. Is it possible to terminate the ssh session while keeping those processes running on the remote machine?


Let $E$ be an extension of a field $F$.   Let $f(x),g(x)\in F[x]$ with $d(x)$ their GCD in $F[x]$.   Claim: $d(x)$ is GCD of $f(x)$ and $g(x)$ in $E[x]$.  Proof. Case 1. $d(x)=1$. Thus $f(x),g(x)$ are coprime in $F[x]$, and so we can write  $$1=a(x)f(x) + b(x)g(x)$$ for some $a(x),b(x)\in F[x]$, and since this expression is valid in $E[x]$ too, so $f(x)$ and $g(x)$ are coprime in $E[x]$.   Case 2. Suppose $d(x)$ is not unit in $F[x]$.   Then $f(x)/d(x)$ and $g(x)/d(x)$ are polynomials in $F[x]$ with GCD $1$, so their GCD is $1$ in $E[x]$. Hence $d(x)$ is GCD of $f(x)$ and $g(x)$ in $E[x]$.   Q. Is the assertion and proof correct?

Let $R$ be subring of integral domain $S.$ Suppose $R$ is $\text{PID}.$ Let $a\in R$ be a greatest common divisor of $r_1,r_2$ in $R$. ($r_1,r_2 \in R$, not both zero). Could anyone advise me on how to prove $a$ is greatest common divisor of $r_1,r_2$ in $S?$   Hints will suffice, thank you.


Say that I have two magnetic dipoles, one of which is rigidly attached to a freely movable inflexible body at some point that is not at the body's center of mass, while the other is fixed in space.  Now I already know how to compute both the force and torque that the dipoles exert directly upon eachother per the , and I can calculate the net force and torque that is exerted on the body due to said force between them, per the answer to , but the answer to that question does not address how to also calculate any additional force and torque on the body due to any torque that is exerted on an off-center point.  This question is admittedly highly similar to , but I do not believe it is identical.   They differ in that the other question was asking about computing effective torque and force on the center of mass from a force being applied off-center, while I am asking about applying both force and torque through an off-center point, and computing the effective force and torque on the center of mass from that.   As I said, I already am aware of how to calculate the net force and torque on the rigid body due to just the force that exists between the two points, but how do add in the issue of torque between them?   Edit:  This is for 3d.  Although I know that torque does not any any additional force when applied to the object's center of mass.  If I twist an object around a point that is not at the object's center, however, in addition to the object starting to spin, the object's center of mass will be moved, and it will spin as if a force and torque HAD been applied to the object's center of mass.  What is that force and torque?  Edit: I do not understand how this question is answered by the one that has been alleged to already answer it, nor do I understand what anyone is thinking I was actually asking about to suggest that the answer to that question would answer mine.   They seem entirely different to me.

I am in search of a simplified version of the derivation of  (both translational and rotational) for a rigid body (3D block) that has a body fixed frame and where the center of mass of the body is not at the center of gravity.  I can find elementary derivations for the same system when the center of mass is at the center of gravity, but not for my system in question.    I am using the derivation as background research for a rotordynamics project that I'm working on.  Any help and or references would be greatly appreciated!  :)


I have just seen some answers here to the effect that     Ten percent of the pie is mine   is correct.  This seems rather odd to me.  Ten percent is a plural subject, so why should it have a singular verb.  Note that, grammatically, of the pie is subordinate to percent and should be inessential; that is, it should be possible to remove it without affecting the grammaticality of the sentence.  My question is not whether the example sentence is correct (that is the question of which this is alledgedly a duplicate) but why it is considered correct -- given my grammatical objection -- and for how long it has been.  I would guess that this is a relatively new phenomenon and that in the good old days, there was no special rule for this case, such that the verb would have had to be are.  References please.    Please do not mark this question as a duplicate without reading it. How is it possible to mistake a question asking why something is considered correct and for how long with one asking what is correct?

Does a percentage require a singular or plural verb, for example, do we say ten percent "go" or "goes"?


A natural number $n$ is prime if and only if, for all primes $p \le \sqrt n$, $p$ does not divide $n$.   I proved the forwards direction, but I'm having trouble proving it backwards

Possible Duplicate:          The question is in the title. Is there a number that is divisible only by numbers greater than its square root? If not, why? I need this because it can speed up a calculation algorithm significantly if the answer is no.


I’m interested in reading some Lord of the Rings books but I’m wondering which ones to start with having to do with History of Middle-earth. Are they all important or can one just read The Silmarillion?

I've already read The Hobbit and The Lord of the Rings, which I assume would be the best start in any case. I also got about halfway through The Silmarillion several years ago and am quite familiar with the legendarium as a whole, but for the sake of argument let's assume I'm starting from scratch.  What is the best order for a budding scholar of Middle-earth to read Tolkien's books? Or does it even matter once you've covered the core novels? Chronological order clearly isn't the most logical approach here, and even publication date isn't necessarily best.   The Hobbit The Lord of the Rings The Silmarillion The Children of Hurin The History of Middle-earth Unfinished Tales The Letters of J.R.R. Tolkien Anything else   Note: After asking this question I found  on Reddit. It covers even more material and in more detail than my original question or any answers here.


Massless particles, be they gluons or photons (I can't think of no other), experience no time. How then can we say that they emit gravitons (to convey the information of their changing position to the surrounding spacetime) or other gluons (since the gluon contains color charge)? How can it be that if time seems to stand still for massless particles, that they emit anything? Or is it just that interaction is an instantaneous event? Without reference to an internal structure? One moment it is there, and the next it's not? I think I got confused by someone here saying that photons can't emit gravitons because a photon doesn't experience time. See also  question.

Quite a few of the questions given on this site mention a photon in vacuum having a rest frame such as it having a zero mass in its rest frame. I find this contradictory since photons must travel at the speed of light in all frames according to special relativity.  Does a photon in vacuum have a rest frame?


Stack Exchange sites function pretty well. Is there something like this available for SharePoint 2013?  I'm looking for some QA/KB application which could be integrated with on-premises installation of SP2013.

One of our client wish to implement a smart collaboration process for its vast pool of employees around 50k located across different continents. They already have SharePoint 2010 enabled as the primary medium of Office Collaboration. As part of scaling their existing knowledge management process, they have opted for having a QA based system for all divisions/departments.  I'm looking for some really interesting inputs here as to how SharePoint can be leveraged to serve as a robust QA based system. I have already identified a few capabilities of SharePoint (like Enterprise Search , Managed Metadata, Workflows ,etc.) that can be of great assistance.   Initially the system is proposed to be fairly a simple prototype without much of the advance features like tag subscriptions , bookmarking tags or ignoring tags, setting bounties etc,.   The primary requirements are  Voting System  basic QA engine Roles Management with simple moderation Tagging  Reputation based Ranking  Search Flaging    Please let me know what capabilities of SharePoint can be leveraged to address this requirement. Any architectural or capacity planning inputs are also welcomed.


I learned linear algebra from books of Friedberg, Gilbert & Strang, Anton etc. by myself. I dare say, that I learned all that stuff eagerly.  Studying by myself, I could not intuitively understand the definition of the determinant (its even – odd manner). I could only memorize the definition, and then use it (or try to use it) to solve some related readers' homework problems or other exercises.  As you know, the purpose of a determinant is literally to determine whether a given system of equations has a unique solution or not.  In other words, the "determinant" will determine whether the row vectors (and equivalently, column vectors) of a given square matrix are independent or not.  If those are mutually independent, then they can geometrically represent an $n$-dimensional quantity (for example, area in 2 dimensions or volume in 3D). If not, some of them are dependent, so they cannot form the $n$-dimensional quantity, and correspondingly the determinant is zero.  A multiple of any row can be added to another, this kind of row elementary operation does not change the determinant value. The picture below illustrates an intuitive understanding of that, too.    Writing the sides of the parallelogram as rows or columns of a square matrix, this transformation transforms it to another with the same value of the determinant.  It can be transformed to Gauss–Jordan form, in this case, each of the row / column vectors are orthogonal because their inner products are all zero. (I tried this with the Gram–Schmidt process; however, intuitively, the result is surely the same.)  Those vectors are orthogonal so it is very clear that just multiplication of the diagonal terms should give directly the aforementioned $n$-dimensional quantity, so that's the determinant in such case.  I understand the determinant in this manner, and it makes sense intuitively.  However the textbook definition mentioned above (defined in the "even–odd" manner) looks very weird to me.  What is the motivation of that definition? And can it be generally derived from my intuition about the $n$-dimensional quantities? I succeeded in doing so for the $2\times2$ and $3\times3$ cases, but I cannot see any generalized relation.  It seems to me that the definition of the determinant comes down magically, without enough logic.  I was wondering if you could help me.  Thank you in advance.

In my linear algebra class, we just talked about determinants. So far I’ve been understanding the material okay, but now I’m very confused. I get that when the determinant is zero, the matrix doesn’t have an inverse. I can find the determinant of a $2\times 2$ matrix by the formula. Our teacher showed us how to compute the determinant of an $n \times n$ matrix by breaking it up into the determinants of smaller matrices. Apparently there is a way by summing over a bunch of permutations. But the notation is really hard for me and I don’t really know what’s going on with them anymore. Can someone help me figure out what a determinant is, intuitively, and how all those definitions of it are related?


I'm a math student myself, but as is natural I encounter some physics along the way too. My question concerns the heat/diffusion model. As the reader will recall this is that the heat function $u(x,t):\Omega\times\Bbb [0,+\infty)\to\Bbb R$ solves the PDE $$u_t-D\Delta u = 0$$ subject to initial and boundary conditions. I will explain the reason for my concern in 1D to make the notation easier. An example of a system would be: $$\begin{cases}u_t-u_{xx} = 0, & (x,t)\in (0,L)\times(0,+\infty) \\ u(0,t) =u(L,t) = d, & t> 0 \\ u(x,0) = g(x), &x\in(0,L)\end{cases}$$  Now of course many other systems can be modeled; using variable boundary conditions, allowing sources/sinks to exist inside the domain, etc. The problem is that none of these modifications do anything to change this fact: if the sources/sinks, initial and boundary conditions are square integrable (this is very weak, a humongous range of horribly pathological creatures are square integrable), then $$u\in\mathcal C^\infty([0,L]\times(0,+\infty))$$  In other words, if I flick a light then the heat in the entire room (no matter how big) is instantaneously affected; it has to smooth out to meet the new condition at once.  No doubt this is preposterous, but I haven't been able to find (online) any modifications to the model that account for transition states. Can anyone share their knowledge here?

Is the speed of heat infinite? When solving the heat equation in a semi-infinite bar, we can see that a pulse in the finite end draws an immediate change in every point of the bar. So, at any given point of the originally constant heated bar the temperature changes. That could send information at a higher speed than light rate to a distant point of the bar.  A deeper question is: Does the mathematical concept of the Real Line can model any magnitude? I mean, if every magnitude is quantified, the Real Line is "behind" reality but never gets real (sorry for the pun).  What do we know about these subjects? Are they paradoxes?


The animate of search is slow (I was using Unity Tweak Tools and CCSM to turn some animation off, but search animate on dash is slow still), anyone knows how to turn it off?

If it's not possible then maybe just the Dash show/hide animations. I simply find myself waiting for animations which is pointless.


I want a cam to zoom out and stop. but it looks silly when it goes from moving to full stop in a frame, so I need it to slow down a few frames before the end.  I found a  few guides, where I should edit the speed in the graph editor window but mine looks nothing like the ones others show.   mine:    why is it not the same ?

When I parent an object to follow a path and animate it, I only get a linear mode animation and changing that in Grapth Editor to bezier doesn't work! How to do that?


After Operation Chimera hit Rainbow Six Siege they said people will get the ash elite skin. I think no body got it.   I got 4 outbreak packs. And luckily I got the Ash elite skin from the outbreak packs. Now if people will get the ash elite skin will my skin that I received from the outbreak pack removed?   Will my elite skin get removed with the new one that we are suppose to receive?

Operation Chimera in Rainbow 6: Siege was just released and I saw a lot of posts about getting Ash's elite skin and 4 outbreak packs for free.  The thing is, after I logged in and got into the game, I didn't get any of them. I restarted the game and tried everything, still no answer.  What is wrong with my game?


I'm trying to design jewellery in mm scale so I have set my scene length to be millimetres. So far, mostly so good I think.  Importing and SVG is no longer in um scale - yay. I'm not quite sure of the scaling, but it imports a letter at about 18mm wide.  I create a belief circle with a radius of 1.5mm (I want a 3mm diameter wire)  I add this to as the bevel object to my letter and all good. But I want to scale the letter up. But it also seems to scale the application of the beizer circle as well. Hmm, lets tackle it a different way.  Wipe everything, import the SVG, scale the letter to the correct dimension, apply scale. Now the curve is showing the correct dimensions, and 1.00 as all the scales. I apply the same 3mm diameter wire I created above, but it has still doubled the wire diameter. Why?  Also, I want to center the letter, so I grab it and move it. The bit I cannot apply location changes to a 2D object? Why?  Ok, so I scaled the wire circle inversely proportionally to the scale I applied to the path. I'm in an OK place. Now I want to taper the object, but. I can not find a working example in the millimetre scale.   If I create a regular bezier curve, and apply it to the taper of my letter. I get a tiny thin wire. So I know that deflection in the Y dictates the thickness along the taper, however I had assumed that the peak of the curve would be 100% of the full bevel.... but it doesn't. If I grab all the points and move them off the y=0 plane in edit more it gets a little thicker possibly... but I can put the peak at 100m and I still only seem to get a tiny line.  Even with a simple example, it does not work as expected. Is this a scaling bug as above?    Can anyone provide an example of how to make bevels and tapers work in the millimetre scale, or point me at what I'm doing wrong, or where my assumptions are wrong? I can provide a simple blender file if that helps anyone?  Thanks

The bevel depth (the radius of the tube) is set to 9cm but it actually isn't when compared to the background grid. This is is confirmed by importing it into sketchup and scaling it to the proper units it turns out the radius is only around 2.286cm. This problem only shows up on certain projects. What's wrong and how do I fix it?  (sorry that I can't upload the file, it's a long story)


Last weekend I was shooting in studio and tethering to laptop as well. First I measured everything and shot the portrait with a 24-70mm lens at f/2.8 Then I switched to 85mm lens and didn't change anything and made sure I am still at f/2.8 and shot the same thing. But on laptop screen I noticed the light on the background seemed to be increased!  But I didn't change anything, I just changed lenses.  So that made me think does the length of the lens affect the exposure even in these short lenses? When I do Large Format photography the length of bellows affects the exposure but hadn't seen such a thing for digital.

I have been comparing my Pentax Takumar 28mm f3.5 lens (via an adapter) to my Canon 18-55mm 3.5-5.6 IS lens.  When I have them both set to the exact same f-stop, the exposure meter of the camera is a few ticks lower when the Takumar lens is being used than it is when the Canon lens is being used.  What could be contributing factors to this? Is it the lens coating? I have read that t-stop takes into account the actual transmitted light, as opposed to the theoretical based f-stop. So my question still sort of remains that same. Why does my one lens have a different t-stop to my other lens, when both are at the same f-stop?  What are the contributing factors to t-stop?


I want to check for empty arrays. Google gave me varied solutions but nothing worked. Maybe I am not applying them correctly.  Function GetBoiler(ByVal sFile As String) As String 'Email Signature     Dim fso As Object     Dim ts As Object     Set fso = CreateObject("Scripting.FileSystemObject")     Set ts = fso.GetFile(sFile).OpenAsTextStream(1, -2)     GetBoiler = ts.ReadAll     ts.Close End Function  Dim FileNamesList As Variant, i As Integer ' activate the desired startfolder for the filesearch FileNamesList = CreateFileList("*.*", False) ' Returns File names ' performs the filesearch, includes any subfolders ' present the result ' If there are Signatures then populate SigString Range("A:A").ClearContents For i = 1 To UBound(FileNamesList)     Cells(i + 1, 1).Formula = FileNamesList(i) Next i  SigString = FileNamesList(3)  If Dir(SigString) <> "" Then     Signature = GetBoiler(SigString) Else     Signature = "" End If   Here if FileNamesList array is empty, GetBoiler(SigString) should not get called at all. When FileNamesList array is empty, SigString is also empty and this calls GetBoiler() function with empty string. I get an error at line   Set ts = fso.GetFile(sFile).OpenAsTextStream(1, -2)   since sFile is empty. Any way to avoid that?

Passing an undimensioned array to the VB6's Ubound function will cause an error, so I want to check if it has been dimensioned yet before attempting to check its upper bound.  How do I do this?


Let $S_4$ be a symmetric group on $4$ elements, $V_4$ - its subgroup, consisting of $e,(12)(34),(13)(24)$ and $(14)(23)$ (Klein four-group). $V_4$ is normal and $S_4/V_4$ if consisting of $24/4=6$ elements. Hence $S_4/V_4$ is cyclic group $C_6$ or a symmetric group $S_3$ (really, there are only two groups consisting of $6$ elements). It is easy to see, that an order of each element of $S_4$ is $1,2,3$ or $4$. So, $S_4/V_4$ is isomorphic to $S_3$.  My question: how to build the isomorphism explicitly?

Exercise $7$, page 51 from Hungerford's book Algebra.     Show that $N=\{(1),(12)(34), (13)(24),(14)(23)\}$ is a normal subgroup   of $S_{4}$ contained in $A_{4}$ such that $S_{4}/N\cong S_{3}$ and   $A_{4}/N\cong \mathbb{Z}_{3}$.   I solved the question after many calculations. I would like to know if is possible to define an epimorphism $\varphi$ from $S_{4}$ to $S_{3}$ such that $N=\ker(\varphi)$.  Thanks for your kindly help.


import java.io.InputStream; import java.io.OutputStream; import java.io.IOException;  /**    This class encrypts files using the Caesar cipher.    For decryption, use an encryptor whose key is the     negative of the encryption key. */ public class CaesarCipher {    private String keyWordString;    private String removeDuplicates(String word){      for (int i = 0; i < word.length(); i++) {         if(!keyWordString.contains(String.valueOf(word.charAt(i)))) {             keyWordString += String.valueOf(word.charAt(i));         }     }     return(keyWordString); }     /**       Constructs a cipher object with a given key word.       @param aKey the encryption key    */    public CaesarCipher(String aKeyWord)    {         keyWordString = removeDuplicates(keyWordString);       keyWordString = aKeyWord;       //create the mapping string       //keyWordString = removeDuplicates(keyWordString);       int moreChar = 26 - keyWordString.length();       char ch = 'Z';       for(int j=0; j<moreChar; j++)       {          keyWordString += ch;          ch -= 1;       }       System.out.println("The mapping string is: " + keyWordString);    }     /**       Encrypts the contents of a stream.       @param in the input stream       @param out the output stream    */          public void encryptStream(InputStream in, OutputStream out)          throws IOException    {       boolean done = false;       while (!done)       {          int next = in.read();          if (next == -1)           {              done = true;           }          else          {             //int encrypted = encrypt(next);             int encrypted = encryptWordKey(next);             System.out.println((char)next + " is encrypted to " + (char)encrypted);             out.write(encrypted);          }       }    }     /**       Encrypts a value.       @param b the value to encrypt (between 0 and 255)       @return the encrypted value    */    public int encryptWordKey(int b)    {       int pos = b % 65;       return keyWordString.charAt(pos);    } }   When I am going to run this code it gives me a run time error that says:  Exception in thread "main" java.lang.NullPointerException     at CaesarCipher.removeDuplicates(CaesarCipher.java:15)     at CaesarCipher.<init>(CaesarCipher.java:29)     at CaesarEncryptor.main(CaesarEncryptor.java:29)   Let's say I enter JJJJJJJavvvvvaaaaaaa and I want it to yield Java and give me the encrypted code. In order to differentiate from the other question that was already asked I need the removeDuplicates method to execute and have the output to print JavaZYWW.....etc. Any help or suggestions? I help would be greatly appreciated

What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them?  What methods/tools can be used to determine the cause so that you stop the exception from causing the program to terminate prematurely?


My sound used to work as expected but after some small update all I find now is "Dummy output" as my output device. Below is the output of lspci -v | grep -A7 -i "audio"  00:1f.3 Multimedia audio controller: Intel Corporation Cannon Lake PCH cAVS (rev 10)     Subsystem: Dell Device 0949     Flags: bus master, fast devsel, latency 32, IRQ 16     Memory at a5518000 (64-bit, non-prefetchable) [size=16K]     Memory at a5200000 (64-bit, non-prefetchable) [size=1M]     Capabilities: <access denied>     Kernel driver in use: snd_soc_skl     Kernel modules: snd_hda_intel, snd_soc_skl, sof_pci_dev -- 01:00.1 Audio device: NVIDIA Corporation Device 10fa (rev a1)     Subsystem: Dell Device 0949     Flags: bus master, fast devsel, latency 0, IRQ 17     Memory at a3080000 (32-bit, non-prefetchable) [size=16K]     Capabilities: <access denied>     Kernel driver in use: snd_hda_intel     Kernel modules: snd_hda_intel   but when running alsamixer I can only see the second one there  also running lspci -knn | grep Audio -A3 doesn't show the first intel driver.  output:   01:00.1 Audio device [0403]: NVIDIA Corporation Device [10de:10fa] (rev a1)     Subsystem: Dell Device [1028:0949]     Kernel driver in use: snd_hda_intel     Kernel modules: snd_hda_intel   sorry if my post isn't organized it's my first

I've been using Ubuntu 18.04 on my Thinkpad X1 Carbon 7th gen for some time now with the audio working just fine, but after running some updates yesterday it seems like the audio card has stopped working when I rebooted this morning, could this be related to each other?  dmsg output:  [   32.624585] skl_hda_dsp_generic skl_hda_dsp_generic: Unsupported HDAudio/iDisp configuration found [   32.624590] skl_hda_dsp_generic: probe of skl_hda_dsp_generic failed with error -22   output from /var/log/apt/history.log:  Start-Date: 2020-03-17  09:30:06 Commandline: aptdaemon role='role-commit-packages' sender=':1.214' Install: linux-image-5.3.0-42-generic:amd64 (5.3.0-42.34~18.04.1, automatic), linux-headers-5.3.0-42-generic:amd64 (5.3.0-42.34~18.04.1, automatic), linux-modules-extra-5.3.0-42-generic:amd64 (5.3.0-42.34~18.04.1, automatic), linux-headers-5.3.0-42:amd64 (5.3.0-42.34~18.04.1, automatic), linux-modules-5.3.0-42-generic:amd64 (5.3.0-42.34~18.04.1, automatic) Upgrade: gir1.2-nm-1.0:amd64 (1.10.6-2ubuntu1.2, 1.10.6-2ubuntu1.4), linux-libc-dev:amd64 (4.15.0-88.88, 4.15.0-91.92), linux-headers-generic-hwe-18.04:amd64 (5.3.0.40.97, 5.3.0.42.99), libnm0:amd64 (1.10.6-2ubuntu1.2, 1.10.6-2ubuntu1.4), network-manager:amd64 (1.10.6-2ubuntu1.2, 1.10.6-2ubuntu1.4), linux-image-generic-hwe-18.04:amd64 (5.3.0.40.97, 5.3.0.42.99), linux-signed-generic-hwe-18.04:amd64 (5.3.0.40.97, 5.3.0.42.99), linux-generic-hwe-18.04:amd64 (5.3.0.40.97, 5.3.0.42.99), network-manager-config-connectivity-ubuntu:amd64 (1.10.6-2ubuntu1.2, 1.10.6-2ubuntu1.4), code:amd64 (1.42.1-1581432938, 1.43.0-1583783132), linux-firmware:amd64 (1.173.15, 1.173.16), docker-ce:amd64 (5:19.03.7~3-0~ubuntu-bionic, 5:19.03.8~3-0~ubuntu-bionic), docker-ce-cli:amd64 (5:19.03.7~3-0~ubuntu-bionic, 5:19.03.8~3-0~ubuntu-bionic) End-Date: 2020-03-17  09:31:51  Start-Date: 2020-03-18  06:58:27 Commandline: /usr/bin/unattended-upgrade Remove: linux-headers-5.3.0-28:amd64 (5.3.0-28.30~18.04.1), linux-headers-5.3.0-28-generic:amd64 (5.3.0-28.30~18.04.1) End-Date: 2020-03-18  06:58:27  Start-Date: 2020-03-18  06:58:30 Commandline: /usr/bin/unattended-upgrade Remove: linux-modules-extra-5.3.0-28-generic:amd64 (5.3.0-28.30~18.04.1) End-Date: 2020-03-18  06:58:31  Start-Date: 2020-03-18  06:58:36 Commandline: /usr/bin/unattended-upgrade Remove: linux-modules-5.3.0-28-generic:amd64 (5.3.0-28.30~18.04.1), linux-image-5.3.0-28-generic:amd64 (5.3.0-28.30~18.04.1) End-Date: 2020-03-18  06:58:40  Start-Date: 2020-03-18  06:58:48 Commandline: /usr/bin/unattended-upgrade Upgrade: libcephfs2:amd64 (12.2.12-0ubuntu0.18.04.4, 12.2.12-0ubuntu0.18.04.5) End-Date: 2020-03-18  06:58:49  Start-Date: 2020-03-18  06:58:53 Commandline: /usr/bin/unattended-upgrade Upgrade: libicu60:amd64 (60.2-3ubuntu3, 60.2-3ubuntu3.1) End-Date: 2020-03-18  06:58:55  Start-Date: 2020-03-18  06:59:01 Commandline: /usr/bin/unattended-upgrade Upgrade: librados2:amd64 (12.2.12-0ubuntu0.18.04.4, 12.2.12-0ubuntu0.18.04.5) End-Date: 2020-03-18  06:59:02  Start-Date: 2020-03-18  06:59:08 Commandline: /usr/bin/unattended-upgrade Upgrade: python3-apport:amd64 (2.20.9-0ubuntu7.11, 2.20.9-0ubuntu7.12) End-Date: 2020-03-18  06:59:09  Start-Date: 2020-03-18  06:59:14 Commandline: /usr/bin/unattended-upgrade Upgrade: python3-problem-report:amd64 (2.20.9-0ubuntu7.11, 2.20.9-0ubuntu7.12) End-Date: 2020-03-18  06:59:15  Start-Date: 2020-03-18  06:59:18 Commandline: /usr/bin/unattended-upgrade Upgrade: apport:amd64 (2.20.9-0ubuntu7.11, 2.20.9-0ubuntu7.12) End-Date: 2020-03-18  06:59:21  Start-Date: 2020-03-18  06:59:24 Commandline: /usr/bin/unattended-upgrade Upgrade: apport-gtk:amd64 (2.20.9-0ubuntu7.11, 2.20.9-0ubuntu7.12) End-Date: 2020-03-18  06:59:25


I expected a to be something after the initial assignment. But I get nothing.  tomas@tomas-Latitude-E4200:~$ echo $a  tomas@tomas-Latitude-E4200:~$ a=0 echo $a  tomas@tomas-Latitude-E4200:~$   Similar unexpected behaviour when a is set before.  tomas@tomas-Latitude-E4200:~$ a=0 tomas@tomas-Latitude-E4200:~$ a=1 echo $a 0   Well?

If I run  export TEST=foo echo $TEST   It outputs foo.  If I run  TEST=foo echo $TEST   It does not. How can I get this functionality without using export or a script?


My question is: Is there an official reason why the Enterprise went on their 5-year Mission? Or was it just to explore new worlds?

There is a small difference between intro texts in TOS:     Space: the final frontier. These are the voyages of the starship Enterprise. Its five-year mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before.   and in TNG:     Space: the final frontier. These are the voyages of the starship Enterprise. Its continuing mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no one has gone before.   (emphasis mine)  It's pretty obvious that no man was changed to no one to include women. But, is there any explanation why was five-year changed to continuing? Also, why was it a five-year mission at all?  My only assumptions are:   Gene Roddenberry hoped to get funding to run the show for 5 seasons. Gene Roddenberry just made up a number without any special meaning. Gene Roddenberry was a .   Is there any official explanation, in universe or not?


I am using blender 2.8, system Ubuntu Here is the video codec of source file H264, MPEG-4 AVC Frame rate 24    In blender, I set the output as File format FFmpeg video Encoding Container MPEG-4 Video codec H.264 Output Quality: High Quality    Why the video gets faded, or a dark shadow is formed after rendering?     Original video screenshot (screencast using Kazam):   Screenshot of video rendered by blender:   I also tried many other settings like AVI, but all are giving the same results.

I already searched the internet but could not find a solution to this. Maybe it is the same question as  but there was no answer.  I want to render a video with tracking, but the output "loses" color information and gets kind of greyish. I first thought that it is related to the renderer, but it happens in Cycles and Eevee. Therefore i made a sample image, added it to the image sequence editor and rendered it as 1 frame. Resulting in the same problem.  I placed the original image beside blenders output so that you can see the difference. The only idea I came up with is that something with the lighting is not correct but I can't find a setting for that.  I am using Blender 2.80 with the default settings. Only set the output resolution to match the input resolution.


What happens if I omit this part? Actually I don't have 10om resistor and I want to know is there any alternative?  ps: I know what is a zobel network. I want to know what happens if I omit it.

Please take a moment to checkout at the LM386 circuit below. The circuit comes directly from the LM386 specifications document:    My question revolves around the output branch consisting of the 0.05 microfarad capacitor and the 10 ohms resistor.  At first I thought that this branch acted as some kind of RC filter but then I realized that on all RC filters (as far as I know) filtering is achieved by taping into the node between the capacitor and the resistor (which is not the case on this branch).  So what is this branch supposed to do? Is it for filtering? Also, what effect does the branch consisting of the 250 microfarad and the speaker has on the output signal? It looks like at the end both branches will combine in parallel and I am having trouble understanding how all these component work together.  Thanks.


Hats break formatting for :        Also applicable for localized sites, .  I think my post is not a dup of  because in current case timestamp is not cutted off, but overhangs.

Hats can be positioned in a way that leaves the bounds of a user's image, but apparently this can also affect time stamp positioning when browsing questions.  In this image, a hat is pushing the time stamp to the right, and the right part of the stamp is cut off due to overflow. The question above it shows what a normal time stamp looks like.


How can I prove  from first principles that $0!$ is equal to $1$?


I try to start an arrow from the center of a split rectangle. A tip here suggested that I should compute the center myself. I tried doing so, but it is still no good. Why does it have to be so difficult?        \documentclass{standalone} \usepackage{tikz} \usetikzlibrary{arrows,calc,positioning,shapes.multipart} \begin{document}\begin{tikzpicture}       \node[draw,circle] (a) {a};       \node[draw,circle, right=of a] (b) {b};       \node[draw,         rectangle split,          rectangle split parts=2,          rectangle split horizontal,above=of b] (c) {}; \coordinate (c1) at ($(c.west)!.5!(c.one split)$); \coordinate (c2) at ($(c.one split)!.5!(c.east)$); \draw[*->,>= stealth] (c1)--(a.north); \draw[*->,>= stealth] (c2)--(b.east); \end{tikzpicture}\end{document}

I would like to use tikz * and o arrows to indicate included/excluded endpoints in plots of piecewise functions, like for example the following one:    However, it seems that tikz always aligns the "tip" of the arrow with the end of the line, so that the code   \documentclass{article}  \usepackage{tikz} \usetikzlibrary{arrows} \begin{document} \begin{tikzpicture}    \draw[help lines] (-.1,-.1) grid (2.1,2.1);    \draw[thick,-*] (0,1.5) -- (1,.5);    \draw[thick,o-] (1,1.5) -- (2,.5); \end{tikzpicture} \end{document}   produces    where I would like the circles to be vertically aligned on the grid line.   Is there a parameter or code I can modify to get the desired behavior?


I have an iso image of 16.04 on a 2 GB stick.  I have tried several different ways to make it a bootable image. I'm running 14.04 and all the posts I find about this seem to be about how to use Windows to make a bootable stick. Can someone please explain to me how to make a 16.04 bootable stick using Ubuntu rather than Windows?

This is the third time I've tried to install Ubuntu Server 14.04.03 64-bit on the same laptop, and each time it caused different problems.  Each time I wrote the same iso image to a USB flash drive by using a different application and OS.   Universal USB Installer (pendrivelinux.com) from Windows WinImage writer from Windows built-in image writer from Linux Mint 17.2    The iso image is the same in all three cases, the USB flash drive is the same, and the laptop is the same. However each time the installation of Ubuntu gave me different installation options. For example, the last time I installed Ubuntu, it didn't show all the packages to choose while installing (Basic Ubuntu server, etc.).


You can simulate a right mouse-click with the magic mouse if you tap the right half of the mouse without touching the left half and THEN click.  But is it possible to achieve a middle-mouse-click with the magic mouse (on OSX 10.6)?  And How?

I'm currently using the old Apple Mighty Mouse and I configured clicking on the trackball as a "middle click" that's been very handy for opening links in new tabs, closing tabs, etc. However, the mouse is starting to show its age and I've been looking at Apple's Magic Mouse and Magic Trackpad, and I'm wondering - do either of these support the "middle click" operation? If not, is there a gesture or a multi-finger click that can be used for the same things (i.e. opening new tabs, etc)?


If a college student asks one of his fellow students the question:     Do you have one exam?   and the student replies:     Yes, I have one exam.   when he actually has four exams, is the answer technically false?

I just wonder if the two following sentences are truth-conditionally the same. Sentence 1 essentially means there existed a student who entered the room, and this situation includes two, three or more students entering the room. Hence, I believe these two sentences are truth-conditionally the same. Are they?        A student entered the room.   At least one student entered the room.      How about        One student entered the room      I gather this is different, as sentence 3 only means one student, not more and not fewer?  Any and all insights would be welcome.


In a linear algebra book, I found the following problem.  Find the rank of the matrix $$\begin{bmatrix} 1 & x & x & \dots & x\\ x & 1 & x & \dots & x\\ \vdots & \vdots & \vdots & \ddots & \vdots & \\ x & x & x & \dots & 1\end{bmatrix}$$  I used four pages of my scrap notebook to find some patterns for the $3 \times 3$ and $4 \times 4$ cases, where the matrix is reduced to triangular ones, and maybe prove by induction. As I need to read ahead, I stopped spending time on this. Besides, I have a job. I guess there got to be a simple way to solve this problem. Does anyone have an idea? Suggestion: As this is known to be duplicate, I might like to edit. Many solution to this problem  I see in stackexchange uses the determinant of the given matix. Unfortunately, the problem appears before the section where the determinant is defined in a book I read (This is not a lie.) Thus, I would like to know a solution which doesn't use determinant or eigenvalues or orthogonal space of {1, 1, ..., 1}.

I want to find the rank of this $n\times n$ matrix \begin{pmatrix} 1 & a & a & \cdots & \cdots & a \\ a & 1 & a & \cdots & \cdots & a \\ a & a & 1 & a & \cdots & a \\ \vdots & \vdots & a& \ddots & & \vdots\\ \vdots & \vdots & \vdots & & \ddots & \vdots \\ a & a & a & \cdots  &\cdots & 1 \end{pmatrix}  that is, the matrix whose diagonals are $1's$ and $a$ otherwise, where $a$ is any real number.  My first observation is when $a=0$ the rank is $n$ and when $a=1$ the rank is $1.$ Then I can assume $a\neq 0, 1$ and proceed row reduction to find its pivot rows. I obtain  \begin{pmatrix} 1 & a & a & \cdots  & a \\ 0 & 1+a & a & \cdots & a \\ 0 & a & 1+a & \cdots & a \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & a & a & \cdots  & 1+a \end{pmatrix} by subtracting the first row multiplied $a$ for each row below the first, and then divides the factor $(1-a)$,  and stuck there. Any hints/helps?


Is there a regular expression to validate an email address in JavaScript?


I just upgraded to 14.04, and wanted to kill time by playing some petris. Then I noticed this:    The problem also exists in other terminals. Is there some option I can set to get the terminal to not show the cursor when it isn't supposed to? (I tried switching cursor style to I-beam, but then it constantly blinks, which is even more distracting.)

I could have sworn that there was once a setting for this in the gnome-terminal "Profile".  And then in some version of Ubuntu, that setting disappeared, and I had to use System ➜ Preferences ➜ Keyboard to uncheck "Cursor blinks in text fields".  Well, neither of those seems to be working now.  So how do I make the cursor stop blinking?


I am extremely new to proofs, and quite bad at them. In studying and practicing the different types of proofs, I developed this very rough proof that $1+1=2$, one of the simplest mathematical truths I could think of, but due to my ignorance I cannot tell if it is valid. Is the following a valid proof, and if not, how can it be improved upon?     Proof:      Let $a=1$. It is true that $a \in \mathbb N \setminus \{0\}$ and $\not\exists x \in \mathbb N\setminus \{0\}$ such that $x < a$. Therefore, $a$ is the least element of $\mathbb N \setminus \{0\}$.      Let $m$ be the least element of $\mathbb N \setminus \{0,1\}$. $2$ is the least element of $\mathbb N \setminus \{0,1\}$, therefore $m=2$.      Assume that $1+1 \neq 2$. There are two possible cases:         Case 1: $2<1+1$. If this is true, then because a set of natural numbers only contains positive whole numbers, $2=1$. Because $2$ is an element of $\mathbb N \setminus \{0,1\}$, $2 \neq 1$. Therefore this case leads to a contradiction.   Case 2: $2>1+1$. If this is true, then there must exist a natural number $z < 2$ such that $z=1+1$. Because two is the least element of $\mathbb N \setminus \{0,1\}$, $2=z$. However, this contradicts the statement that $z<2$, and therefore this case leads to a contradiction.         Because assuming that $1+1 \neq 2$ leads to contradiction, it must be true that $1+1=2$.

Is it possible to prove that $1+1 = 2$? Or rather, how would one prove this algebraically or mathematically?


I have a BIND9 database with a wildcard record:  * IN CNAME host.mydomain.tld.   I want to get my DNS server to "spoof" NXDOMAIN for chosen names:  nxhost1 => NXDOMAIN nxhost2 => NXDOMAIN etc...   Is this achieveable with BIND9?  If so, how can I do it?  Thanks.

With OpenDNS now needing one to be on the pro package to have filtering turned on, being on a tight budget, we are in need of free DNS filtering.  After reading , I collected SquidGuard blacklists and concatenated domains in the categories i needed into one big list. I then fed it to  generating a file containing about 2 million zones.  named-checkconf parses it just fine, but reloading named takes almost 10 minutes, then it wont resolve anything, and the server slows down to a crawl. Removing the include results in named working properly again.  Whats the proper way to set up BIND9 to work as a DNS firewall efficiently? If it's possible to also block any domain that resolves to specific IP addresses that would solve the whole problem.   I'm running bind as non-authoritative, just a caching server.


I see different people writing different statements for declaring main()  Like,  int main()  void main()  int main(void)  int main(int argc, char* argv[])   I mean when to pass arguments? what is the need of it? when to declare int as return type and when void?  I have just started practising coding when I see people writing different main() declaration I actually get puzzled.

What is the correct (most efficient) way to define the main() function in C and C++ — int main() or void main() — and why? And how about the arguments? If int main() then return 1 or return 0?  There are numerous duplicates of this question, including:       — For C++, with a very good answer indeed.     Related:


I like to read in my x-y-data from different files and then process them somehow. I read different questions here on each topic ( and ) but I somehow can't manage throwing them together. The following MWE works but I can't process the data. I loaded the x-y-data seperately into \xData and \yData but I can't get them to be plotted as they are seperated. The data I can get plotted I can't process...  \documentclass{scrartcl} \usepackage[utf8]{inputenc} \usepackage{amsmath} \usepackage{pgfplots, pgfplotstable}  \listfiles  \begin{document}  \begin{tikzpicture}  \pgfplotstableset{ create on use/y/.style={create col/copy column from table={chi_probe.dat}{0}} }  \pgfplotstableread{grid_omega_opt.dat}\xData; \pgfplotstableread{chi_probe.dat}\yData;  \begin{axis}[ width=0.85\linewidth, height=8cm ]  \addplot[black, smooth] table [y=y] {grid_omega_opt.dat};  \end{axis}  \end{tikzpicture}  \end{document}

I've two one column data files (A.txt and B.txt). To plot them together first I load dataA with  \pgfplotstableset{ create on use/dataA/.style={create col/copy column from table={A.txt}{0}} }   Then I put them together with  \begin{figure}[ht!] \begin{tikzpicture} \begin{axis}     \addplot table [x =dataA,y index=0,y expr=\thisrowno{0}*-1] {B.txt}; \end{axis} \end{tikzpicture} \end{figure}   I've no problem to change the sign of the data from B.txt as so can see above.... BUT:  How to do if I want to change the sign from the loaded table dataA??   Has anybody got a helpful idea or minimal example?  EDIT: A minimal example could look like this:  \documentclass{article} \usepackage{pgfplots, pgfplotstable} \usepackage{filecontents} \begin{filecontents}{A.txt} 2 3 4 5 3 5 \end{filecontents} \begin{filecontents}{B.txt} 5 4 3 2 5 5 \end{filecontents}  \pgfplotstableset{     create on use/dataA/.style={create col/copy column from table={A.txt}{0}} } \begin{document} \begin{tikzpicture} \begin{axis} \addplot table [x=dataA , y index=0 , y expr=\thisrowno{0}*-1] {B.txt}; \end{axis} \end{tikzpicture} \end{document}   The task is to change the sign in my figure environment of my 'dataA'.


I'm attempting to get a better understanding of cryptography and have run into some questions about bcrypt.  Bcrypt relies on the blowfish cipher, which is a reversible method of encryption. But bcrypt is not reversible. How is that possible? Or am I mistaken? What does bcrypt do on top of blowfish to make it irreversible?  Why does bcrypt use blowfish instead of twofish or threefish?


\begin{table*}     \begin{center}    \caption{Comparison of existing methods using infrared array sensor.}    \begin{tabular}{c c c c c c c} \\ \toprule          {Study} & {IR sensor (resolution)} & {No. of sensors} & {Position of the sensor} & {Methods} & {Accuracy} & {limitations} \\ \hline         Mashiyama et al.\cite{Mashiyama_2014} & $8 \times 8$ & 1 & Ceiling & SVM & above 94\% & Very limited activity in small area, no transition of activity detection \\ \midrule         Mashiyama et al.\cite{Mashiyama_2015_2} & $8\times 8$ & 1 & Ceiling & k-NN & 94\% & Less-effective feature extraction methods  \\ \midrule         Kobayashi et al\cite{Kobayashi_2018} & $8\times 8$ & 2 & Ceiling, Wall & SVM & above 90\% & Particular positions difficult to differentiate the activity due reactive pixels \\ \midrule       Xiyui  et al.\cite{Fan_2017} & $8\times 8$ & 1 & Wall & LSTM, GRU & 75\% and 85\% & Very limited perform only in parallel and perpendicular to the sensor     \\ \midrule         Taniguchi et al.\cite{Taniguchi_2014} & $16\times 16$ & 2 & Ceiling, Wall & Time series analysis & 72\% & Old approach less accuracy \\ \midrule         Taramasco et al.\cite{Taramasco_2018}& $1\times 16$ & 2 & Opposite corner of the room & LSTM, GRU, Bi-LSTM & 93\% & Its highly computation cost to implement to the devices  \\\bottomrule            \end{tabular}\label{tabular_1}     \end{center} \end{table*}  The table in the following image is somewhat close to what I'm looking to achieve.

I have a table that I want to insert on a page, but at least one (perhaps both) of the following conditions are met:   The table is too wide to fit within the text block or page. That is, I'm exceeding some horizontal restriction. The table is too tall to fit within the text block or page. That is, I'm exceeding some vertical restriction.   What are my options to make this table fit? If it doesn't fit, regardless of my attempts, what other options exist?


Is it possible to delete your profile from one community and stop being a member of it?   I don't want to delete my full stackEchange account, just my profile in one community.  I found this:  but I'm scared to delete my profile completely.

How can I delete my Stack Exchange account(s)? Also,  What happens to my content? Can I request it be deleted as well? What if I'm suspended, rate-limited, or banned from posting questions or answers? What will happen to my votes? Will other users be impacted? Why wasn't my account deleted immediately after the timer expiring? What will happen to my pending bounties and close, reopen, delete, or undelete votes? I want my account deleted on all Stack Exchange sites. How do I do this? Will my profile on chat be removed once I delete my site account?   For more information, see "" in the .


Use mathematical induction to prove that $1^3 + 2^3 + 3^3 + .....+ n^3= \frac{n^2(n+1)^2}{4}$ for all $n\geq1$.  Can anyone explain? Because I have no clue where to begin. I mean, I can show that $1^3+ 2^3 +...+ (k+1)^3=\frac{(k+1)^2(k+2)^2}{4}$, but then I don't know where to go. I need further explanation to prove it.  thank you so much for help  Sincerely

How can I prove that     $$1^3+ 2^3 + \cdots + n^3 = \left(\frac{n(n+1)}{2}\right)^2$$    for all $n \in \mathbb{N}$? I am looking for a proof using mathematical induction.  Thanks


Per   # Download latest stable release using the code below or browse to github.com/drush-ops/drush/releases. php -r "readfile('http://files.drush.org/drush.phar');" > drush # Or use our upcoming release: php -r "readfile('http://files.drush.org/drush-unstable.phar');" > drush  # Test your install. php drush core-status  # Make `drush` executable as a command from anywhere. Destination can be anywhere on $PATH. chmod +x drush sudo mv drush /usr/local/bin  # Optional. Enrich the bash startup file with completion and aliases. drush init   So I try it but get the following error:  [Michael@devserver ~]$ php -r "readfile('http://files.drush.org/drush.phar');" > drush [Michael@devserver ~]$ php drush core-status PHP Warning:  pcntl_exec(): Error has occurred: (errno 13) Permission denied in phar:///home/Michael/drush/includes/startup.inc on line 359  Warning: pcntl_exec(): Error has occurred: (errno 13) Permission denied in phar:///home/Michael/drush/includes/startup.inc on line 359 Error has occurred executing the Drush script found at /home/Michael/drush (errno 13) Permission denied [Michael@devserver ~]   So then I try running it as root.  [Michael@devserver ~]$ su - Password: [root@devserver ~]# php /home/Michael/drush core-status  PHP configuration      :  /etc/php.ini  PHP OS                 :  Linux  Drush script           :  /home/Michael/drush  Drush version          :  8.1.2  Drush temp directory   :  /tmp  Drush configuration    :  Drush alias files      :  [root@devserver ~]#   So, all is good, and I just need to install it as root?  Any way I can install it as a normal user?  Thanks

I run a Linux server that is administered by a friend of mine, and at the moment I work with Filezilla.  I've heard that Drush is a trivial installation: it seems to require no configuration and work out of the box.   However, it looks for configuration in several places:     Drush installation directory,  the home directory (as .drushrc.php),    root directory of a Drupal installation, and  site directory of a   Drupal installation.  Since the configuration files are just PHP   scripts, they can  contain any PHP code that you would like to have   executed on startup of Drush.  one could for instance call ini_set()   to set the value of a PHP configuration option.   and the configuration file /opt/drush/drushrc.php with following content:    # Allow Drush to use 128 MB of memory. Use -1 for no limit. ini_set('memory_limit', '128M');   I see this is necessary because PHP's default is too low, but I'm not sure if I need higher-level privileges because of it.  Do I have to have root-level permissions on the server, or am I able to work with Drush without them?   Update:  As far as i understand this, i only have to ask my admin to get some more privileges (permissions)Note according to BetaRides answer i need to have more than only the access-data that the FileZilla needs - that are provided for the filezilla! Guess so - but i don not need root-permissions.  btw - i have secure-shell-access (ssh2 access) guess that this is enough -With that i can setup a sftp-connection to the server with filezilla just lemme know - if i can use the exactly same data for the shell access (with the command line tool=?!=