Since the new user interface was put in place, a notification was added so that users would know when there is more then five suggested edits in the edit queue.  This icon has always displayed in a lighter orange color (which I do not have a picture of at the moment).    Then today, I was browsing and I noticed the notification was a shade of red?     I'm assuming the different colors mean different things, but is this documented anywhere?

The  color scheme for the suggested edit indicator and the moderator/10k flag indicator is:   red #800000 for suggested edits ; orange #fe7a15 for flags ; light blue #1e7ecc for the moderator inbox.   I find the contrast of the suggested edit indicator poor. (It's the old color scheme from MSO and I found the contrast poor then.) I also find it inconsistent that the moderator inbox and the moderator flag indicator have completely different colors.  Please switch the flag indicator to the blue shade used for the moderator inbox indicator. This frees orange as a color for suggested edits, which is what it was on most sites before the top bar overhaul. (Alternatively, the fairly similar beige (?) that was used on SO could be used instead.)  I'm not hung on this color choice; what I really want is better contrast for the suggested edit indicator, and the same color for both moderator indicators.


If $(X,d)$ is metric space, $x\in X$ and $A \subset X$. Let's mark $$\text{dist}(x,A) = \text{inf}\; \Big\{ d(x,y) : y \in A \Big\}$$   Does there always exists $y_0 \in A$ that $ \text{dist}(x,A) = d(x,y_0)$ ? Will the answer change, if set $A$ is closed?  Can someone help to solve this exercise?

Is it true that if $Y \subset X$ is a closed set and $x \notin Y$ then $\exists$ an element $y_0 \in Y$ $s.t.$ $d(x,Y)=d(x,y_0)$ where $d(x,Y)= inf \{d(x,y) : y \in Y \}$ and $d: X \times X \to \mathbb R$ is a metric.   I was looking the proof of Riesz lemma and something like it came across in it. If the above is true then I will get some result in the proof.  Please someone help..  Thank you..


I've updated my Ubuntu version from 13.10 to 14.04 last week using the update-manager.  However, my kernel version did not update:  $ uname -r 3.11.0-12-generic $ lsb_release -a No LSB modules are available. Distributor ID:  Ubuntu Description:     Ubuntu 14.04 LTS Release:         14.04 Codename:        trusty   This makes virtualbox and any other thing that needs updated linux-headers to not work (The old 3.11 linux-headers are not present in the repo).  I know  but I want to use the default kernel that came with trusty (I think it's 3.13.0-24), so that I know everything is supported.  How can I update my kernel to the correct version?

After upgrading to 14.04, my kernel is not upgraded! it's like before:  Linux Boxi 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux  Here's what I did:  sudo apt-get update sudo apt-get dist-upgrade sudo do-release-upgrade sudo apt-get update sudo apt-get dist-upgrade     lsb_release -a  No LSB modules are available. Distributor ID: Ubuntu Description:    Ubuntu 14.04 LTS Release:    14.04 Codename:   trusty


What are all the possible $α$- and $ω$-limit sets of points for the linear system of equations $x'=Ax$ given by the following matrices $A$:  I guess I don't really know how to get started, Could I have some guidance? So I was told to calculate the eigenvalues (fine) and eigenvectors (I kind of forgot how to do that...)   $    A=   \left[ {\begin{array}{cc}    -4 & -2 \\    3 & 11 \\   \end{array} } \right] $   $λ_1=-10$ $λ_2=-5$  for $λ_1=-10$:  eigenvector $    =   \left[ {\begin{array}{cc}   1 \\    3 \\   \end{array} } \right] $  for $λ_2=-5$:  eigenvector $    =   \left[ {\begin{array}{cc}   2 \\    1 \\   \end{array} } \right] $   $    A=   \left[ {\begin{array}{cc}    1 & 1 \\    3 & 1 \\   \end{array} } \right] $   $λ_1=4$ $λ_2=-2$  for $λ_1=4$:  eigenvector $    =   \left[ {\begin{array}{cc}   1 \\    1 \\   \end{array} } \right] $  for $λ_2=-2$:  eigenvector $    =   \left[ {\begin{array}{cc}   -1 \\    1 \\   \end{array} } \right] $   $    A=   \left[ {\begin{array}{cc}    4 & 5 \\    -5 & -2 \\   \end{array} } \right] $   $λ_1=1+4i$ $λ_2=1-4i$  for $λ_1=1+4i$:  eigenvector $    =   \left[ {\begin{array}{cc}   -3/5-(4i)/5 \\    1 \\   \end{array} } \right] $  for $λ_1=1-4i$:  eigenvector $    =   \left[ {\begin{array}{cc}   -3/5+(4i)/5 \\    1 \\   \end{array} } \right]$

What are all the possible $α$- and $ω$-limit sets of points for the linear system of equations $x'=Ax$ given by the following matrices $A$:  I guess I don't really know how to get started, Could I have some guidance? So I was told to calculate the eigenvalues (fine) and eigenvectors (I kind of forgot how to do that...)  I know that the $ω$-limit sets of points are the set of points that the system of equation approach as time goes to infinity, and the $α$-limit sets of points are the points approached as t goes to negative infinity.   $    A=   \left[ {\begin{array}{cc}    -4 & -2 \\    3 & 11 \\   \end{array} } \right] $   $λ_1=-10$ $λ_2=-5$  Since both eigenvalue are negative, this is a stable node, and the $ω$-limit set=0.  for $λ_1=-10$:  eigenvector $    =   \left[ {\begin{array}{cc}   1 \\    3 \\   \end{array} } \right] $  for $λ_2=-5$:  eigenvector $    =   \left[ {\begin{array}{cc}   2 \\    1 \\   \end{array} } \right] $   $    A=   \left[ {\begin{array}{cc}    1 & 1 \\    3 & 1 \\   \end{array} } \right] $   $λ_1=4$ $λ_2=-2$  Since one eigenvalue is positive and one is negative, it is not stable, so I can't use the same reasoning that I used above to find the $ω$-limit set... so I am not sure how to continue  for $λ_1=4$:  eigenvector $    =   \left[ {\begin{array}{cc}   1 \\    1 \\   \end{array} } \right] $  for $λ_2=-2$:  eigenvector $    =   \left[ {\begin{array}{cc}   -1 \\    1 \\   \end{array} } \right] $   $    A=   \left[ {\begin{array}{cc}    4 & 5 \\    -5 & -2 \\   \end{array} } \right] $   $λ_1=1+4i$ $λ_2=1-4i$  for $λ_1=1+4i$:  eigenvector $    =   \left[ {\begin{array}{cc}   -3/5-(4i)/5 \\    1 \\   \end{array} } \right] $  for $λ_1=1-4i$:  eigenvector $    =   \left[ {\begin{array}{cc}   -3/5+(4i)/5 \\    1 \\   \end{array} } \right]$


I`m unable to terminate process by SIGKILL signal.   $ ps aux | grep -i phps username 17564   0.0  0.0        0      0   ??  ?E   Sun09AM   0:00.00 (phpstorm) username 27664   0.0  0.0  2442020    788 s000  S+   11:53AM   0:00.00 grep -i phps $ sudo kill -9 17564 $ ps aux | grep -i phps username 17564   0.0  0.0        0      0   ??  ?E   Sun09AM   0:00.00 (phpstorm) username 27883   0.0  0.0  2423392    312 s000  R+   11:55AM   0:00.00 grep -i phps   What does it mean that process in parentheses? How to kill it?

I'm unable to kill a process using any of the techniques I'm aware of ("Force Quit" in Activity Monitor, top, killall from the Terminal) and wonder if there are some additional steps I can take.    ~ $ sudo killall -KILL 77439 Password: No matching processes were found ~ $ killall -KILL 77439 No matching processes belonging to you were found ~ $ killall 77439 No matching processes belonging to you were found ~ $ killall Mathematica No matching processes belonging to you were found   FWIW the process is "Mathematica" which I cannot relaunch, Quit, or Force Quit, or sample, either by name or PID, and it appears to have some odd side effects (screenshots don't appear, can't empty trash, and can't even shut down the system).  Are there additional steps that can be taken to really really kill a badly behaved process?


[removed, apparently its duplicated question..]

What is a good rule of thumb for how to choose the question for the null hypothesis. For instance, if I want to check if the hypothesis B is true, should I use B as the null, B as the alternative hypothesis, or NOT B as the null? I hope the question is clear. I know that it has something to do with the error I want to minimize (Type I?), but I keep forgetting how it goes, because I don't have a clear intuition built for it. Thanks.


"You can fool some of the people all of the time, and you can fool all of the people some of the time, but you can’t fool all of the people all of the time." (Abraham Lincoln) Let  $P$ be "fooling some of the people all of the time", $Q$ be "fooling all people some of the time", $R$ be "fooling all of the people all of the time".  $(P \lor Q) \rightarrow \neg R$ Is this a correct translation in propositional logic?

You can fool some of the people all of the time, and you can fool all of the people some of the time, but you can't fool all of the people all of the time.    My attempt is   $$((\exists(x),A(x)) \land(\forall(x),S(x))) \land \neg (\forall(x), A(x))$$  Such that  $A(x)=$ You can fool all the time  $S(x)=$ You can fool some of the time  Just starting out basic logic and I'm looking to see where I"m making mistakes. Thanks


Apparently, when it was in the cop compound, it was able to turn off the lights and pretty much nail every cop on first shot. Pretty neat that the T-800 series could see in night vision, probably something that Kyle Reese should have mentioned!

In Terminator 2: Judgement Day, how does the T-1000 sense things? It's made of mimetic poly alloy; however, does it have a retinal scan camera like the T-X or T-800, or is just molecules that allow it to see what it does? In other words: let's say it is made out of nanobots. Would a group of these nanobots provide the capability of sight? Kind of like humans with cells that  make up the brain? I have always wondered whether James Cameron explained this on a special edition or if the topic was left up for insight from Terminator fans. From what I get from the whole mimetic poly alloy and some of the extra scenes, it seems to feel its way out to get information. Of course, it's very much not blind! Thoughts?


Where can I find informative material detailing how to properly use (s) and syntax for accounting for one or many nouns in a sentence?  Example:  If there was freezing weather, the heated enclosure(s) for the dry, preaction, and/or deluge valve(s) were/was checked to make sure it/they was/were adequately heated.  If it is one enclosure and one valve, then this makes sense: If there was freezing weather, the heated enclosure for the dry, preaction, and/or deluge valve was checked to make sure it was adequately heated.  If it is more than one valve and more than one enclosure, then this makes sense: If there was freezing weather, the heated enclosures for the dry, preaction, and/or deluge valves were checked to make sure they were adequately heated.  If it is more than one valve, and only one enclosure, then this makes sense: If there was freezing weather, the heated enclosure for the dry, preaction, and/or deluge valves were checked to make sure they were adequately heated.  I'm looking for a robust way to handle all scenarios in one sentence.

I have a question about the following construction and which instance is correct.        Selecting an appropriate study topic(s).   Selecting appropriate study topic(s).      When it is both singular and plural due to the parenthesized optional part, should I use the an because of thinking of what follows as being the singular (that is, study topic)?  Or should I omit the an because of thinking of what of what follows as being in the plural (that is, study topics)?


I am trying to remove sliver polygons under a certain area.  I need to do this in a stand alone Python script, and not from within the GUI.  Is this possible?  In standalone python I was trying a piece of code base on processing.run("qgis:eliminateselectedpolygons",\  but that is not available from an external script.  Eliminate works great if I'm in the GUI.

I'm writing a script which must work outside of QGIS GUI. I call some API functions from qgis.core but I'd like to use the processing plugin.  I'm able to import processing with sys.path.append() but I can't run any process. Moreover, all "native" algs are missing in QgsApplication.processingRegistry().algorithms()  So is it possible to run processing that way ? What am I missing ?  import os, sys from qgis.core import * QgsApplication.setPrefixPath('/usr', True) qgs = QgsApplication([], False) qgs.initQgis()  sys.path.append('/usr/share/qgis/python/plugins') from processing.core.Processing import Processing Processing.initialize() import processing  layer1 = QgsVectorLayer('data/ROUTE_PRIMAIRE.SHP') layer2 = QgsVectorLayer('data/ROUTE_SECONDAIRE.SHP')  processing.run('qgis:union', layer1, layer2, 'test.shp') # returns nothing   I'm on QGIS 3.0.1 - Debian 9


Is there a way to view or log what applications have been opening windows in my system? I have Windows 10.  My reason for wanting to do this is that I have a really annoying issue where every hour something on my system opens a command prompt window and then immediately closes it. I've scanned with Malwarebytes and it hasn't turned up anything. I've also turned on history in Task Scheduler, but no task's run time corresponds with when it happens. I'm hoping to log all the times windows are opened to figure out what is causing this.

I'm wondering if there's any log which stores information about a particular program such as when the program has started and closed manually on Windows such as MS Word, or Chrome. Any ideas?


Hi guys:)How can I see what of ten elements is visible in viewport?

Is there an efficient way to tell if a DOM element (in an HTML document) is currently visible (appears in the viewport)?  (The question refers to Firefox.)


I attempted to integrate the following function from a practice problem in my Calculus textbook:  $$\displaystyle \int_{0}^{\frac{\pi}{2}}{\frac{1}{1+\tan^\sqrt{2}(x)}} \ {\rm d}x$$  I failed to find an indefinite integral, and I am assuming getting an indefinite integral is simply impossible. Using Wolfram|Alpha to estimate the definite integral, I got $0.785398$. I am assuming this is $\frac{\pi}{4}$, but I have no formal proof that this is the answer.

Evaluate the integral $$\int_0^{\pi/2} \frac{1}{1+\tan^\alpha{x}}\,\mathrm{d}x$$


I'm playing the crafting dead modpack on technic launcher and it doesn't let me use my F-keys, instead it zooms. All the F-keys do this except F1. It even does that when I play Minecraft using the regular launcher. It doesn't do that at my dad's computer. Can somebody tell me how to fix this or at least tell me why it does that? I'm using a desktop with a keyboard, not a laptop if that helps.

I can't get the coordinates on my computer because it keeps changing the brightness.  I have a windows 8 Samsung, and I'm playing Minecraft version 1.6.4.


I have a doubt about this sentence:  "If your product arrives broken our Returns Department will organise a replacement as long as you contact them within 24 hours of having received the parcel."  Can the "Returns Department" be referred to as "them" even though it is singular? Using "it" just doesn't sound right to me.

I'd say Microsoft have a way of bending the rules and I know that McLaren have won the championship. While this sounds strange, I believe it is correct English (sorry, I'm not native).   But when it's a small company, would you still use it this way? Is a company always plural, or are small companies singular? I.e., would you say Bakery Johnson makes fine bread or Bakery Johnson make fine bread? Is it My book seller, Woody's, have moved or is it has moved?


Scientists and researchers from the University of Delhi and the Zoological Survey of India have discovered a genus of tree frog found in the Andaman islands and the northeast.

When I write something like this:     I am a man that is doing these things.   Is it correct to shorten it like this?     I am a man doing these things.   And does it require commas?


I have two OSes installed, Ubuntu 14.10 and Windows 7. Now I want to remove Ubuntu from my system.  How can I remove Ubuntu and keep Windows?

I have absolutely no experience with Linux, and I desperately need to get my computer back up and running again with Windows.  How do I remove Ubuntu and reinstall Windows?    Editor's note: many of the answers are about removing Ubuntu from dual-boot but keeping Windows (which is a bit complicated), while other answers are about removing Ubuntu from single-boot (which is easy: basically just format the disk while installing Windows). The question as written is ambiguous between dual-boot or single-boot.


THE PROBLEM  Consider a pendulum with an hollow spheric bob of negligible weight filled with 1.1 kg of fine sand and hanging from an inextensible wire of negligible mass and $l= 30 m$ long. At the point which is diametrically opposite to the point where it is hung to the wire, the sphere has a small hole from which the sand can come out with a constant flow of 1 g/s.  In the rest position the hole is at a distance $h = 1 m$ from the horizontal floor. At time $t = 0$ the sphere is placed at a distance $d = 30 cm$ from its rest position, the hole is opened and the sphere is let go (see the drawing for a better understanding).  Neglecting any friction and referring to a Cartesian axis that runs along the floor in the direction of the motion of the sphere and whose origin is at the point closest to the rest position of the sphere, compute:   the position where the sand falls as a function of the time $t$; the maximum distance at which the sand is deposited; the points where the greatest amount of sand is accumulated; the distribution of the mass of sand on the floor.   Assume that the sand remains exactly at the point where it touches the floor.  HINT Some useful trigonometric formulas: $$cos(arctan(x))=\frac{1}{\sqrt{1+x^2}}\qquad\qquad \sin(arctan(x))=\frac{x}{\sqrt{1+x^2}}$$    (WORKING ON) THE SOLUTION  I suppose that the first thing to notice is that the little-angle approximation can be used since the starting angle $\vartheta_{\text{MAX}}$ (at $t=0$) is easily computed as $$\vartheta_{\text{MAX}}=arcsin(d/l)=arcsin(0.01)\simeq 0.01000017$$  and it's very small. Hence $sin(\vartheta)$ can be approximated with $\vartheta$ and $cos(\vartheta)$ with $1$.  In this approximation, it is well known that the pendulum period is $$T = 2\pi\sqrt{\frac{l^*}{g}}$$ Now, strictly speaking, $l^*$ should be the distance between the point in which the wire is hung and the center of mass of the bob. At $t=0$ this means $l^* = l+R$, where $R$ is the radius of the hollow sphere. With the sand flowing away, the center of mass will shift downwards, increasing $l^*$ and hence increasing the time period only to be back at its initial position $l+R$ when there's no sand left inside the bob.  However, since the problem does not give the value for $R$, I assumed that a point-like approximation for the bob could be used, hence using $l^* = l$ regardless of how much sand is left inside the sphere.  I guessed this is what who wrote the problem was asking for since the period so computed is $T \simeq 11s$: a number matching too well the $1.1 g/s$ of the constant flow of sand to be a coincidence (giving the sphere emptied in $100$ periods).  Assuming all of the above is right, I went on to write the equations of motion for the flowing sand:   \begin{array}{ll}         x(t) &= x_s + v_x t = l\,sin(\vartheta(t)) + l \dot{\vartheta(t)} t \simeq l\,\vartheta(t) + l \dot{\vartheta(t)} t\\         y(t) &= y_s + v_y t - \frac{g}{2}t^2= h + l(1-cos(\vartheta)) + l \dot{\vartheta(t)} sin(\vartheta(t)) t - \frac{g}{2}t^2 \simeq h + l \dot{\vartheta(t)} \vartheta(t) t - \frac{g}{2}t^2         \end{array}    Then I'd like to set $y(t)=0$ in order to solve for $t$ and substitute inside the equation for $x(t)$...but I don't know how to proceed. Plus, how should the given HINT be useful?  Any help to solve this would be extremely appreciated!  EDIT (why this is not a duplicate)  This question is not a duplicate because I'm not asking of how the period of pendulum varies with the flowing of the sand but, assuming it does not vary (an approximation), I'm asking about the position where the sand falls as a function of the time $t$; the maximum distance at which the sand is deposited; the points where the greatest amount of sand is accumulated; the distribution of the mass of sand on the floor.

How do you find time period as a function of time for a simple pendulum that is in the form of a hollow sphere that is filled with mercury and there is a hole in the bottom through which the mercury is constantly falling at a fixed rate? I tried creating a function for the time period to check how it varies with the mass of mercury, but I had too many variables.   EDIT: This question was a concept based multiple choice question in my homework book. The option were time period becomes erratic, time period increases, time period decreases, time period first increases then decreases.


What's the difference between >> and >>> in Verilog/SystemVerilog?   I know that == tests for only 1 and 0 while === tests for 1,0,X,Z. So how is that similar to the shift operator?

What is the difference between >> and >>> in verilog/system verilog? I know that == tests for only 1 and 0, while === tests for 1, 0, X, Z. So how is that similar to the shift operator?


"Though the number of women's welfare societies are growing." "Though the number of women's welfare societies is growing."  Which one is correct? I found this sentence in GMAT question book.

Duplicate:                      The number of residents has grown.    The number of residents have grown.      Which of the above sentences is grammatical? Since has should stick with singular nouns and have with plural ones, I guess (2) should be correct, but I'm not sure.


I recently found out about a program called Fspy. to use it with blender it requires an add-on. I tried installing the addon and blender said modules installed successfully, but I couldn't find the add-on in the preferences. I tried manually installing the add-on (by unzipping it and putting it in this file destination: C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons. I can see the folder in the destination but not n blender.  does anyone know how to fix this?

I am continuously trying to install FSPY, but according to the instructions on the Github, it is clearly mentioned that not to unzip it.  I tried it to import it as File>Import>fspy, but there is no option for FSPY... I also tried to install the zip file from Blender(Install Addon)   Then how can I install it? Any advice will be really appreciated!


I use HMAC(ciphertext)+ciphertext for authenticated encryption.  The same key is used for both MAC and encryption.  Is that right? Is using separate keys for MAC and encryption necessary or any good?  I ask this beacause I have read somewhere that keys used for one role shouldn't be used for the other role.

Is it a weakness to use a single shared secret for protecting messages using a Encrypt-then-MAC scheme?    Assuming a system is using AES-256-CBC and a SHA1-HMAC and the same secret key for both operations.  Upon intercepting one of these messages and attacker could brute force this secret key by trying to solve the HMAC or by successfully decrypting the first block of the ciphertext.  Performing  a decryption on a single block of AES-256 should be a lighter operation than performing a SHA1-HMAC on a potentially large message.  Therefore AES-256 is ideal for a massively parallel brute-force attack and the use of the SHA1-HMAC doesn't hurt the system.  Is this approach sound, or is there an attack that has not been taken into consideration?


I'm stuck with the last part of this question: solve $x^2 \equiv 140 \pmod{221}$.  We know that $140 = 7 \times2^2\times5$ and $221 = 13 \times 17$.  We split the original congruence in two, so we have:  $x^2 \equiv 140 \pmod{13}$  $x^2 \equiv 140 \pmod{17}$  Applying the properties of moduli we have:  $x^2 \equiv 10\pmod{13} \rightarrow x=\pm6$  $x^2 \equiv 4\pmod{17}  \rightarrow x=\pm2$  After this point, it's not clear for me how I can arrive to the complete solution. Any advice?

I split this into $x^2\equiv 1\pmod {7}$ and $x^2\equiv 1\pmod {13}$.  For $x^2\equiv 1\pmod {7}$, i did: $$ (\pm1 )^2\equiv 1\pmod{7}$$ $$(\pm2 )^2\equiv 4\pmod{7}$$ $$(\pm3 )^2\equiv 2\pmod{7}$$ Which shows that the solutions to $x^2\equiv 1\pmod {7}$ are $\pm1$.  For $x^2\equiv 1\pmod {13}$, i did: $$ (\pm1 )^2\equiv 1\pmod{13}$$ $$(\pm2 )^2\equiv 4\pmod{13}$$ $$(\pm3 )^2\equiv 9\pmod{13}$$ $$ (\pm4 )^2\equiv 3\pmod{13}$$ $$(\pm5 )^2\equiv {-1}\pmod{13}$$ $$(\pm6 )^2\equiv 10\pmod{13}$$Which shows that the solutions to $x^2\equiv 1\pmod {13}$ are $\pm1$.  Thus, I concluded that the solutions to $x^2\equiv 1\pmod {91}$ must be $\pm1$. I thought that $\pm1$ were the only solutions, but apparently I am incorrect! How do I go about finding the other solutions to this congruence?


Please how could I possibly show that the sequence defined by   $U_{n+1} = \frac{1}{2} (U_n + \frac{a}{U_n})$ converges Given that $U_0 > 0$ and $a>0$  I have calculated $\frac{U_{n+1}}{U_n}$ which is positive but $U_{n+1}-U_n$ doesn't yield any result and i can't show it is bounded.  Thanks in advance

Let $a > 0$. Choose $x_1 >$ $\sqrt a$. Define a sequence {$x_n$} recursively as $x_{n+1} = 1/2(x_n + a/x_n)$ for $n > 1$.   Prove that lim$x_n = \sqrt a$.  I think I first want to prove that {$x_n$} is bounded below by $\sqrt a$. But, I am having trouble with this. Could someone help me out a little?


Does anyone remember a TV show from the mid-to-late '80's that was somewhat sci-fi (ish) where a family gets either transported to another planet, or to another time/dimension where everything is a utopian society.   There's not much I recall except that I thought the young teen son in the show was handsome (shut up, I was 11) and when the mom & daughter went to the grocery store, all the food items are labeled generically (white with black letters) and all the labels say "good food".  Anyone recall the name of this show?

Hey guys I've been trying to find the name of this show for years and it's bothering me. It was definitely mid-80s (probably about '85-'87). It was about a family who somehow travelled forward through time. They were "on the run" from some evil guy dressed in all black who drove this black futuristic vehicle.  I'm sure it was an entire family who was sort of "lost" in this future world as this guy in black pursued them. It had several character actors from the 80s (I can see their faces but can't place them), especially the evil guy and the father character who I know I've seen in other things from that era.  I know also that it didn't last long, maybe only a few episodes. Maybe only one episode? But it was when the VCR first came out and I watched this one episode over and over.  Thanks.   Entire family travelled forward in time somehow, get "lost" and end up on the run from some security guard type evil guy in all black Mid 1980s - probably 85-87 Television, USA, English Very short-lived Caucasian family, they were always altogether, it was clear they were a family "lost" in the future I only saw the first episode, unsure if there were any more They somehow travelled into the future, clearly accidentally, they didn't intentionally travel through time (I don't remember how they did it) and the security in the future was after them and they were running around, exploring this future world Main character was just the family, but also they focused on the evil guy in black a lot. The evil guy was a 80s character actor I know I've seen in other things.


This is a proof I've been trying to figure out since the problem was presented to me.  We are given that $\lambda$ is an eigenvalue for a matrix $A$ and the vector $u$ is the eigenvector corresponding to $\lambda$.  The problem asks to us to prove that ${\lambda}^2 + 1$ is an eigenvalue for $A^2 + I$, where $I$ is the identity matrix.  I am not quite sure where to start.  My first instinct was to somehow manipulate $Au = {\lambda}u$, but I'm not quite sure what to do with it.  Any ideas for this one? It's certainly an interesting problem, in my opinion.

This is a proof I've been trying to figure out since the problem was presented to me.  We are given that $\lambda$ is an eigenvalue for a matrix $A$ and the vector $u$ is the eigenvector corresponding to $\lambda$.  The problem asks to us to prove that $\lambda^2 + 1$ is an eigenvalue for $A^2 + I$, where $I$ is the identity matrix.  I am not quite sure where to start.  My first instinct was to somehow manipulate $Au = \lambda u$, but I'm not quite sure what to do with it.  Any ideas for this one? It's certainly an interesting problem, in my opinion.


I have two project in my visual studio solution project A and project   B. Project A deploys its dll into the GAC.  Project B references the   dll of project A. Now I would like to know whether I should add the   reference of project A from its' bin directory or from GAC, which one   is the good practice.

And on top of that, are there cases where one has to use the global assembly cache or where one cannot use it?


For example,  double myArray[3] = {0.0};  myArray["SSN_1"] = 2.0; myArray["SSN_2"] = 3.0; myArray["SSN_3"] = 2.0;  for(... how? ...) { ... Print ... but, how? ... }   If you have any reference, please link.

Can a string be used as array index in C?  Ex: String      Corresponding value "ONE"       1 "TWO"       2 "FIVE"      5 "TEN"       10  When a string in the above list is passed to the function, the function must return the corresponding value indicated above. Can this be achieved by declaring a constant array with string as index  int *x; x["ONE"]  = 1; x["TWO"]  = 2; x["FIVE"] = 5; x["TEN"]  = 5;  return x["string received by the function"];   The above logic does not work as expected; is there a workaround to implement the above logic in order to have a string-indexed array?


Kicking in chat is pretty useless and/or pointless. Everything that happens when you are kicked is, you are sent to the room list. There's no kick message, no "kicked by" message, no kick reason, nothing. For all a user knows, it's either a transient bug or a network hiccup. How is that useful?  The user can also immediately rejoin the chat. There's no repercussions for the user being kicked, it's just annoying. Even as a mod-only tool it's basically useless and annoying/confusing rather than a helpful moderation tool.  You may want to consider either removing it, or turning it into something more effective -- maybe user-specific room-specific 30 seconds long silencing.

Currently, moderators can kick users out of a room.  I've done this to two users now, and they just come right back into the room.  I conclude that it's not effective for its presumed purpose (slowing down trolls or other troublemakers, on a room-specific basis).  I propose that a delay be imposed on users after getting kicked, before they can re-enter a room.  It wouldn't have to be a large delay; 15 minutes at the most.  This would satisfy those folks who need a way to slow down users that are disruptive, without having to resort to long lists of users with write access and use of "gallery mode."  It's also a less blunt instrument than suspending users from chat.  In addition, if this isn't already a feature request,  I think room owners should be able to kick users.


I found this site today while searching for a book and hope someone can help. When I was a boy I read a hard-bound anthology of science fiction stories. This was circa 1986, but the book might have already been a little old. I can only remember three stories:  One was about a man working in space who had nightmares of his impending death by a giant bee. This ultimately cost him his life when he was killed while working on the outside of his spaceship, that was in the shape of a bee (or some other insect, but I think it was a bee). The front cover MIGHT have been a picture of this bee-looking spaceship, but I'm not entirely sure. I remember the picture, but it might have been within the story.  Another story was about a post-apocalyptic world where humanity had long moved underground for protection while rockets were still firing off in a long-forgotten war. Children became rarer and most families had synthetic children. A boy and a girl, who were friends, decided to escape to the surface mostly guided by their curiosity I think. They find out that the rockets were being exploded immediately by robots (as far as I remember) and that there was really nothing to be afraid of on the surface. Their flimsy suits quickly dissolved or something in the air or water and at the very end we got to know that their names were Adam and Eve.  The last story of the book was about dinosaurs that got loose. Possibly kind of Jurassic Park on another planet, and how the humans escaped.   I would really appreciate it if anybody can help. It's like an itch I cannot scratch and would really like to find this book, having children of my own now :)

I read this in the early to mid 80's.  It was a textbook sized hardcover anthology with color illustrations throughout.  Each story had a few images, some were full page illustrations.  The particular story I remember the most involved Earth survivors living underground.  Robots controlled the war from the surface.  A teenage girl and boy decided to sneak away to the surface as no one had been up there in a long time.  The kids discover greenery and a healthy environment, with rusted robot guardians.  The robots had been keeping the humans fooled that the war was still going on, and had kept them under the surface.  Mars had been wiped out from nearly the first volleys of missiles.    The robots judge the teenagers as worthy and let them remain on the surface.  The kids had silver jumpsuits that dissolved when they got wet.  The robot illustrations were blocky, almost weathered stone-like statues.  They had nearly spherical feet and square simple heads.  The faces had eyes and simple mouths.  -edit- The robots were similar in shape to the one in this picture, but smoother, and no arms.  The illustrations with them had the robots being several stories tall.  I kind of remember that the kids emerged from the belly of one or something like that.


I submitted a manuscript to an Elsevier journal on 8 days ago. However, the "Current Status" of the manuscript is still "Submitted to Journal".   Is it common that the status "Submitted to Journal" lasts over a week?   When I click "Send E-mail" in the "Action Links", it shows that "This letter should not be used at this time. This submission is not in a status that would allow this letter to be sent to the intended recipient."  I cannot even withdraw this manuscript now because the Action Links do not contain "Withdraw" button. I submitted several manuscripts to this journal about three years ago. I checked the email at those moments. When I approved the submission of PDF files built by the submission system, I would receive a confirmation email from the editorial office. However, this time I did not receive any such email.   What should I do at this moment?

I have submitted a paper to a journal 2 and a half months ago. Its status remains "With editor". From your experience, is this normal? If not, how should I deal with that?


I have a canadian PR card but my passport is for iran. I have flight from toronto to tehran with two stops first in london and then in frankfurt. As i checked lonon government website i don't need a visa for transitting through london due to my canada PR card. But i'm not sure if i need a visa for my stop in frankfurt, as both london and tehran are out of schengen areas so i assume i won't have to get out of international transit area in frankfurt. Also all of my flights are with lufthana and i won't be changing airports. Any help is appreciated .

I found many related questions on this site but I am still not sure about the rules. How can I decide if I need a visa to transit? Schengen members as of May 2021 are as follows:  Austria Belgium Czech Republic Denmark (excluding Greenland and the Faroe Islands - but an open border with the Schengen Area is maintained) Estonia Finland France (excluding overseas departments and collectivities) Germany Greece Hungary Iceland Italy Latvia Liechtenstein Lithuania Luxembourg Malta Netherlands (excluding Aruba, Curaçao, Sint Maarten and the Caribbean Netherlands) Norway (excluding Svalbard) Poland Portugal Slovakia Slovenia Spain (except Ceuta and Melilla) Sweden Switzerland


We are using Geoserver 2.10.0. While displaying the labels in the maps, the labels which are there on the border of the tiles(4*4) are not getting displayed properly. the labels can be seen after further zooming in or out(when they fall in the center of the tile and not in the border). in this image you can see the labels are being cut  On zooming further, the labels come properly, as expected  In the first image(1.png), the labels are cut. But in the second image(2.png), we see on zooming further, the labels are coming as expected.  Please help.  Can someone please suggest a solution without using GeoWebCache.

When I use specific icons for point display using GeoServer, several icons are cropped automatically. This is may be because of tile size or else.   How can I resolve this?


This is not a duplicate of , as while that's the same issue, it was fixed in version 1.0.93; this is a fresh regression in 1.0.95. The team prefers that users file new bug reports for regressions.  Massive gaps between items    App Version: 1.0.95 Device Manufacturer: samsung Device Model: SM-P585   OS Version: 7.0 (P585JXU2BQF1)

Since the last update (v1.0.85), I am getting all the question pages blank on the Android app. For those who are confused with the image, I'm using RtL (Right-to-Left) layout.        If I scroll down (quite a bit) I can see the question. But even then I cannot see the question title, the related comments or answers.         App Version: 1.0.85 Device Manufacturer: LGE Device Model: LG-D620   OS Version: 5.0.2 (152541901f156)


I recently did a fresh install of ubuntu 18.04 and installed chromium web browser. I followed  and  instructions to add the gnome shell extensions vai google web store and from terminal. When I try to add extensions I still get this message  Although GNOME Shell integration extension is running, native host connector is not detected. Refer  for instructions about installing connector.  I have no idea what the problem could be. Should I reinstall chromium? I'm not familiar with how snap works, but I installed chromium from the Ubuntu software store. According  they suggest installing the universe version of chromium. I'm not sure what the difference is here. Would someone explain this please.

Got an error from Firefox saying :      Although the GNOME Shell integration extension is active, the native host connector is not recognized. Please consult the installation manual.   Which is an error that seems to never happen, I'm using Ubuntu 18.04 (Dual Boot Windows 10), and yes GNOME shell is installed via   sudo apt-get install chrome-gnome-shell   I'm using Firefox v64.0.2 (64 bits) snap.  Could someone help?


I am cooking 4 stuffed pork loins on the same rack in a 350 degree oven. Cooking time in recipe is 90 min. (Based on 1 meat portion) Does cooking time change for 4 ?

Do I need to adjust the oven temperature in a roast duck recipe if I want to put more than one duck in the oven at a time.   I suspect I should keep the same temperature but keep them in longer.  Should I cover each duck in foil individually or together?  Does it matter if they are on the same pan?


Is there any way to prove that: $$ 1^2+2^2+3^2+\ldots +n^2=\frac{n(n+1)(2n+1)}{6}$$ but WITHOUT using mathematical induction? (I don't know, maybe through some creative graphical demonstration?)

I am just starting into calculus and I have a question about the following statement I encountered while learning about definite integrals:  $$\sum_{k=1}^n k^2 = \frac{n(n+1)(2n+1)}{6}$$  I really have no idea why this statement is true. Can someone please explain why this is true and if possible show how to arrive at one given the other?


I tested an array with 10 million elements and iterating is always faster than streams. Can someone explains why? String[] words = new String[10000000]; Arrays.fill(words, "hello world!");  Instant start = Instant.now(); long count = 0; for (String word : words) {     if (word.length() > 8)         count++; } Instant end = Instant.now(); System.out.println("Using iterations:" + count + " in  " + Duration.between(start, end).toMillis());  start = Instant.now(); count = Arrays.stream(words).parallel().filter(word -> word.length() > 8).count(); end = Instant.now(); System.out.println("Using Streams   :" + count + " in  " + Duration.between(start, end).toMillis());  Sample run Using iterations:10000000 in  13 Using Streams   :10000000 in  53

How do you write (and run) a correct micro-benchmark in Java?  I'm looking for some code samples and comments illustrating various things to think about.  Example: Should the benchmark measure time/iteration or iterations/time, and why?  Related:


I want to know how many days does it take for a cancelled wire transfer to be  reversed into my account.

I sent money from a bank that doesn't have a space for intermediary bank, so I put the intermediary bank statement information where the beneficiary bank information is supposed to be.  I  don't know what will happen now.


My friend and I are switching from PS4 to Xbox One. We have a Minecraft world saved that we have been working on for over a year and would really like to move it to Xbox One, however it doesn't seem possible. Is it even possible?

I have not been able to find any answers to this question:  My friend and I both have PS4's, and we both like Minecraft. We have a saved world, but he has it on his Xbox One, I don't have an Xbox One. Is it possible to transfer the Minecraft data from the Xbox one to his PS4?


Yes, I know that this is a pluralization bug. I have purchased enormous locks for my doors and am currently inside a box made of high-quality woven waffles (a waffle box!), guarded by an army of unicorns - I'm fully protected against all bludgeoning attempts.    I have noticed something disturbing on the user profile page - specifically that  has apparently been a member for 1 years, 2 months:    I could have sworn that this used to say 1 year, but it seems to have been borked. Could we fix improve the grammatical quality of this?

I think the picture pretty much explains it all.  Not sure if this is the case for all SE sites, but this is from Stack Overflow.


I can't apply threshold adjustment on a smart object. So I decided to unsmart it but can't find the way to do it. Please suggest.

I've created a design in Photoshop CS6, and used a large number of smarts object which made the workflow more easy (at least for me). Now I've finished working on the design, and I want to "unsmart" all the objects due to the large file size of the PSD. I do not want to do Rasterize Layer because I want to keep every layer which was originally on the Smart Object. I want to convert each smart object (some of them have Layer Styles applied) to a group (folder) which will have all the layers inside + the FX applied originally to the Smart Object and it will be in the exact location of where the smart object was before. I couldn't find anything about this in the internet. Also, some of the smart objects has inner smart objects inside of them. I don't mind doing this manually, but to copy & paste every layer in smart object is very annoying way, because I must scale and transform the layers pasted.


I have a question regarding the Schengen border rules. I, a Canadian citizen, entered Germany on February 1st, 2017. I got my student visa on March 3, and it will expire on June 20. However, I will be traveling in Europe (I will enter Italy on June 19 and stay there until I return home on June 29th) after the expiry of my residence permit. As I understand, the border code states that the time I lived under my residence permit does NOT count towards my 90 day limit:        For intended stays on the territory of the Member States of a duration of no more than 90 days in any 180-day period, which entails considering the 180-day period preceding each day of stay, the entry conditions for third-country nationals shall be the following:   ...   For the purposes of implementing paragraph 1, the date of entry shall be considered as the first day of stay on the territory of the Member States and the date of exit shall be considered as the last day of stay on the territory of the Member States. Periods of stay authorised under a residence permit or a long-stay visa shall not be taken into account in the calculation of the duration of stay on the territory of the Member States.      Source:     However, I don't want this to cause problems during my travels. I contacted the German visa office and they told me flat out NO (to traveling after my permit expires), saying that I have to stay out of Schengen for another 90 days. But then the rule in the border code doesn't say that. So, I need some guidance. Who do I contact from here?    Some additional details: - I will be entering Italy on the 19th of June (one day before my residence permit expires), and remaining there until I fly back

I have a 1-year residence permit from one Schengen country that is now expiring. Upon its expiration, I would like to get my 90/180 days validity as a tourist to stay, or return here as soon as possible.  I understand that the tourist short-stay scheme is based on the 90/180 days "counter". But what happens if my previous stay was not tourism but residence (as searching year). Wouldn't that mean that I can quickly exit and re-enter the Schengen area to activate my tourist stay?   Also, is there a way to change this purpose of stay without exiting the Schengen area?


Suppose I have two independent random vectors, $X$ and $Y$, both of size $n\times 1$. We have that $\mathbb{E}[X] = \mu_X$ and $\mathbb{E}[Y] = \mu_Y$. We also have that $\mathrm{Cov}(X) = \Sigma_X$ and $\mathrm{Cov}(Y) = \Sigma_Y$. I am seeking the properties of the random vector obtained by the elementwise product of these random vectors, $Z = X\odot Y$. I know that the expectation is $\mathbb{E}[Z] = \mathbb{E}[X]\mathbb{E}[Y]$, but I don't know how to obtain the covariance $\mathrm{Cov}(Z)$.  As this is intended to be the first step toward the inner product, it may be simpler to discuss the expectation and variance of the random variable $z = X^\intercal Y$.  Thank you for your help!

This should be a fairly straight forward but I still couldn't quite get it. Let $X$ be $n$ by $1$ random vector, $Y$ be another $n$ by $1$ and that $X$ and $Y$ are independent. What is $Var(X^tY)=:V_{XY}$?  I tried generalizing this formula from the univariate case $Var(xy)=E(x)^2Var(y)+E(y)^2Var(x)+Var(x)Var(y)$  except I hit a bit of a roadblock for the 3rd term above. That is, I get $$ V_{XY}=X^tV_YX+Y^tV_XY\\+E[(X^t-\mu_X^t)(Y-\mu_Y)(Y^t-\mu_Y^t)(X-\mu_X)] $$ So... what is it?


When I run sudo wpa_supplicant -Dwext -iwlan3 -cwifi.conf 2>&1 I get:  Successfully initialized wpa_supplicant ioctl[SIOCSIWAP]: Operation not permitted ioctl[SIOCSIWENCODEEXT]: Invalid argument ioctl[SIOCSIWENCODEEXT]: Invalid argument wlan3: Trying to associate with 9c:3d:cf:fb:95:96 (SSID='Bell514' freq=2462 MHz) wlan3: Association request to the driver failed wlan3: Associated with 9c:3d:cf:fb:95:96 wlan3: Authentication with 9c:3d:cf:fb:95:96 timed out.   Yet when I run:  sudo wpa_supplicant -Dwext -iwlan3 -cwifi.conf 2>&1 | grep --line-buffered wlan3   I only get:  ioctl[SIOCSIWAP]: Operation not permitted ioctl[SIOCSIWENCODEEXT]: Invalid argument ioctl[SIOCSIWENCODEEXT]: Invalid argument   Am I not redirecting the stderr properly?

I have a script which calls two commands:  long_running_command | print_progress   The long_running_command prints progress but I'm unhappy with it. I'm using print_progress to make it nicer (namely, I print the progress in a single line).  The problem: Connection a pipe to stdout also activates a 4K buffer, so the nice print program gets nothing ... nothing ... nothing ... a whole lot ... :)  How can I disable the 4K buffer for the long_running_command (no, I do not have the source)?


I'm trying to print the element with the index of every element in the list   But my implement prints every element with index 0 and every element with index 1 until the last index  can anyone fix it, I'm stuck here?  if __name__=="__main__":      r = [6, 5, 3, 3]     diff = [[(i,j)for i in r]for j in range(5)]     print(diff)   Actual output:  [[(6, 0), (5, 0), (3, 0), (3, 0)], [(6, 1), (5, 1), (3, 1), (3, 1)], [(6, 2), (5, 2), (3, 2), (3, 2)], [(6, 3), (5, 3), (3, 3), (3, 3)], [(6, 4), (5, 4), (3, 4), (3, 4)]]   Desired output:  [(6, 0),(5, 1),(3, 2),(3, 3)]

How do I access the index in a for loop like the following?  ints = [8, 23, 45, 12, 78] for i in ints:     print('item #{} = {}'.format(???, i))   I want to get this output:  item #1 = 8 item #2 = 23 item #3 = 45 item #4 = 12 item #5 = 78   When I loop through it using a for loop, how do I access the loop index, from 1 to 5 in this case?


Here is a MWE with initial skip 3:  \documentclass{article} \usepackage[table]{xcolor} \usepackage{tabularx} \begin{document} \begin{table}   \rowcolors3{blue!20}{green!20}   \caption{With tabular}   \begin{tabular}{*3{p{0.33\columnwidth}}}     \hline     Time  & Money   & Length \\     \hline     Contemporary \\     Sec   & \$      & inch   \\     Hour  & cents   & cm     \\     \hline     Ancient \\     ?     & Dinar   & Yard   \\     horae & Drachma & Palm   \\     \hline   \end{tabular} \end{table} \begin{table}   \caption{With tabularx}   \rowcolors3{blue!20}{green!20}   \begin{tabularx}{\columnwidth}{XXX}     \hline     Time  & Money   & Length \\     \hline     Contemporary \\     Sec   & \$      & inch   \\     Hour  & cents   & cm     \\     \hline     Ancient \\     ?     & Dinar   & Yard   \\     horae & Drachma & Palm   \\     \hline   \end{tabularx} \end{table} \end{document}     EDIT Indeed, a duplicate. But, the short answer: tough luck buddy, is not so immediate in the original.

Seems like \rowcolors when used for a {tabularx} doesn’t work properly: The specific number of the first row to be colored is ignored. This is not the case for a normal {tabular}.    In both tables the coloring should start in the third row.   \documentclass{article}  \usepackage{tabularx} \usepackage[table]{xcolor}  \begin{document}  \begin{minipage}{0.45\textwidth}    \verb|{tabularx}| \\[2ex]    \rowcolors{3}{blue!50}{yellow!60}    \begin{tabularx}{40mm}{X}       1 \\ 2 \\ 3 \\ 4 \\ 5 \\ 6 \\    \end{tabularx} \end{minipage}\hfill \begin{minipage}{0.45\textwidth}    \verb|{tabular}| \\[2ex]    \rowcolors{3}{blue!50}{yellow!60}    \begin{tabular}{p{40mm}}       1 \\ 2 \\ 3 \\ 4 \\ 5 \\ 6 \\    \end{tabular} \end{minipage}  \end{document}   Is this a bug in xcolor/tabularx?    This question is kind of a follow-up question of my answer on


I can't turn on my iPhone because I don't remember my iCloud username or password.  What can I do to log into my iPhone?

My device is iPhone 4. I forgot my icloud username and password. How can i recover my username and password ? Would you please help me ? Its important as i cant use my device.


I am using a 64bit octo-core 2.4ghz server. that has ubuntu 14.04 32bit installed. along with ubuntu 16.04 32 bit installed. i would like to remove ubuntu 16.04 without touching ubuntu 14.04 it has all my important files on it. and i would then like to, once 16.04 is removed, i would like to install ubuntu 20.04 64 bit. does anyone know how to remove ubuntu 16.04 and not damage anyother files out of it's partition ? thanks in advance. Matthew  well tbh they are my moms files. currently i have ubuntu 14.04 and 16.04 running on dual boot. all i want to do is remove ubuntu 16.04 without damaging 14.04... i think i would have to go into the partition editor and delete the partition for ubuntu 16.04

Supposing I have two Linux distributions, in dual boot (the GRUB menu appears and ask me what to choose):   Ubuntu 14.04 elementary OS   Adding a new one is very simple: just insert the installation device and start installing.  What about uninstalling one? How can I uninstall elementary OS, for example?  Can I do that only by formatting/deleting that partition?


I would like to have a derivation of the following close-form $$Im \ \text{Li}_3\left(\frac{1+i}2\right)= \frac12\int_0^1 \frac{\ln^2(1-x)}{1+x^2}dx$$ I expect that I could just rely on the recursive representations of the polylogarithmic functions below $$\text{Li}_3 \left(\frac{1+i}2\right)= \int_0^{\frac{1+i}2} \frac{\text{Li}_2(t)}t\ dt  =  -\int_0^{\frac{1+i}2} \frac{dt}t\ \int_0^t\frac{\ln(1-s)}s ds $$ and manipulate the RHS, (e.g. IBP, substitution, etc.) to arrive at the desired integral, with no luck yet. Would like to get some pointers in deriving it.

How to prove      $$I=\int_0^1\frac{\ln^2(1+x)}{1+x^2}\ dx=4\Im\operatorname{Li}_3(1+i)-\frac{7\pi^3}{64}-\frac{3\pi}{16}\ln^22-2\ln2\ G$$   Where $ \operatorname{Li}_3(x)$ is the the trilogarithm function and $G$ is the Catalan constant.  Variant approaches are appreciated.


Disclaimer: I am not in a mathematics field or a mathematics professional.  I'm interested to know how many random draws it would take to have a particular chance (50%, 75% and 90%) of getting 5 specific results (out of a pool of 12 possible results) at least once each, assuming that it is possible to obtain each result more than once and that each result is equally probable.   Eg. How many times would you have to roll a 12-sided die before you had a 50% chance of rolling at least one each of the numbers 1, 2, 3, 4 and 5? How many rolls for a 75% chance? How many rolls for a 90% chance.   I know this is a variant of the coupon collector problem, but my maths is nowhere near good enough to work on the problem or to even follow many of the explanations I've found online.  While I'm primarily interested in the "5 out of 12" scenario mentioned above, I'm also curious what the formula would be for "X out of Y" where X is the number of specific results that are desirable and Y is the total number of possible results.

I a programmer not a mathematician so please excuse my ignorance and please dumb it down for me.  My research indicates that this is a variation of the Coupon Collector problem but I really don't know how to get the answer.  Assuming $n$ equally likely desired selections (Probability for each=$1/m$) how many selections with replacement must be made to have an $X$ probability of getting at least one of each of the $n$ desired objects?


I know my administrative and account password. But, whenever I try to change it or do anything like connecting to wifi, connecting to a new internet connection whether it be wired or a mobile network, or anything work, my Ubuntu 12.04 ( Which I have been using since 2012) is showing this message for a few days, I will be highly grateful if someone tells me how to solve this , I deadly need to connect wifi at least.

I installed  (Precise Pangolin), 64 bit. Nowhere was I asked to set password for root.  I just installed  software. It was installed under the /root folder by default. Now I try do something on that folder. I tried with su to switch to root, but I don't know its password.   Should I always use sudo or get the default root password, if any?  How do I create a  for software installed inside the /root directory?


Below is the query i want to run without using tooling api is there a way possible if not how to use tooling api in my code as i Have never used it in code apart from dev console. SELECT  QualifiedApiName FROM EntityDefinition where QualifiedApiName = 'objectname' AND IsFieldHistoryTracked = true AND IsReportingEnabled = true AND IsSearchable = true

I am trying all my level best to know how the Tooling API is used. Can someone suggest or show me with a small example on how do I create a apexClass in a controller method.   I have already generated metadataservice from WSDL.


We have been taught that the universe has a constant amount of energy but if energy can be converted into matter, how is it constant?

If total energy is conserved just transformed and never newly created, is there a sum of all energies that is constant? Why is it probably not that easy?


I learned that our atmosphere has ~78% Nitrogen and ~21% Oxygen. If I fill a glass with 21% water and 78% Canola Oil, the more dense (and thus heavier) water will take a full bottom later and Canola Oil will sit on top and take the rest of the space.  Why don't we see the same in our atmosphere? Troposphere is the bottom layer, Oxygen is Heavier than Nitrogen; but why is the composition of the bottom layer of our atmosphere still same as the overall composition? What obvious clue am I missing?

According to numerous sources online, the percentage of oxygen is approximately the same at sea level and 10,000 meters. Since oxygen is heavier than nitrogen, shouldn't the percentage of oxygen decrease with altitude?


The programs that I open are behind the Unity launcher.    How do I solve this issue?

I'm on Ubuntu 16.04.1 at the moment, and system windows like the Files window, Terminal or System Software open behind the Unity launcher, which means they are partially hidden behind it. I can move them with Alt+F7, but I'd like a more permanent solution to this problem.


I have been hit by a virus, i noticed the virus infection during the setup of infectious scam app. It installed so many other apps and registry keys, the usual viral changes.  i was able to clean my pc so far, but there's one file left in the system32/drivers folder ... eyfmunxx.sys file  i can't find the corresponding service in the list of services, and i suspect it's the reasonthat trustedinstaller is being invoked after everytime i clean my pc and somehow without even internet access, two viral processes "winsrv.exe" and "winxsrv.exe" are recreated in my windows folder...   Anyway, i think that's the only thing left if i remove this .sys file i'll be able to completely remove this infection. The problem is, for this particular file, i'm not even able to take ownership of it. Everything is access denied, from copying it, renaming it, deleting it of course... as well as trying to view permissions or change permission to the extent of not being able to take ownership.  I mean how can such a file get so much priority in my windows? Or is it cheating locking resources or something like interrupting intentionally to disallow any way for windows to deal with it?  I still have two other solutions, system restore, or get some other booting system and connect to the harddisk and delete while windows is down.  I'm asking here maybe there's another solution, coz usually this type of virus might corrupt/infect system restore.  I tried unlocker, didn't help, it doesn't show any open handle on it.  Any ideas?

What should I do if my Windows computer seems to be infected with a virus or malware?  What are the symptoms of an infection? What should I do after noticing an infection? What can I do to get rid of it? how to prevent from infection by malware?   This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive, most comprehensive answer possible. Feel free to add your contributions via edits.


I have an iOS app that uses core location and calculates the distance between two points. It outputs the result to a label which works fine when running on an actual device. But when I run it on the simulator, I get nothing. Is it suppose to work on the simulator as I have location services enabled as you can see in the screenshot below?  Thanks for any help.

How can I set the location (as it's picked up in CoreLocation services) in the iPhone Simulator?


I want to conform my site's string handling to support other languages per UTF-8. It seems that the best way to do this is to forsake all the standard string functions.  So I have two options, I can set the mbstring.func_overload option in php.ini or I can go back over my code and just replace all the functions with mb_*. I would assume that the second option will be easier on people using my code as they won't have to change their sever config. (if they even can!)  What about when PHP 6 comes out? Should that have any baring on my choice since it will support proper multibyte processing.

I'm in the process of making my PHP site Unicode-aware. I'm wondering if anyone has experience with the mbstring.func_overload setting, which replaces the normal string functions (e.g. strlen) with their multi-byte equivalents (mb_strlen). There aren't any comments on the PHP manual page.  Are there any potential problems that I should be aware of? Any cases where calling the multi-byte version is a bad idea?  I suppose one example would be functions that deal with encryption, since they may expect to deal with strings of bytes, rather than strings of characters.  Also, the manual page includes a note: "It is not recommended to use the function overloading option in the per-directory context, because it's not confirmed yet to be stable enough in a production environment and may lead to undefined behaviour."  Does that mean that it's not stable in a per-directory context, or it's generally not stable? The wording is unclear.


I am creating a an application where a client can send TCP packets  to a server and the server will respond.However, when I flush() my buffered data to an outputstream, it produces a nullpointer exception. For each new client that connects, a new thread with a class is created. Here is the class:   public class clientHandler implements Runnable{     private boolean loggedin = false;     private String username = "";     Socket cs;     OutputStream rawoutput; //for some reason I had to pass the outputstream directly to the constructor rather than get it here, here it would produce a npe     clientHandler(Socket clientSocket, OutputStream bos){         rawoutput = bos;         cs = clientSocket;     }     DataOutputStream output;     {         try {             output = new DataOutputStream(rawoutput);         } catch (Exception e) {             System.out.println("rip OS");             e.printStackTrace();         }     }   //a couple more methods...       private void metaData(String data) throws Exception{         if(data.startsWith("/iusername")){             String[] useful = data.split(";");             System.out.println(useful[0].split(":")[1] + " logged in");             output.writeBytes("logged in");             output.flush();             username = useful[0].split(":")[1];             loggedin = true;         }     } }   I am using netcat as a 'client' until I write my own. Is this perhaps why it causes the NPE? I have tried this all different kinds of outputstreams and writers and they all produce error at either the initialization, the write or the flush.

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?


I have 2 Javascript arrays:  ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'] ['a', 'b', 'c']   I need to insert elements of second array into the first array every 4th or nth index of the first array, resulting in:  ['a', '1', '2', '3', '4', 'b', '5', '6', '7', '8', 'c', '9', '10', '11', '12']   n needs to be a parameter, so I can move n to the 5th location, or 3rd location when needed.  Any solutions appreciated. ES6 ones would be great! Thank you in advance.

I am looking for a JavaScript array insert method, in the style of:  arr.insert(index, item)   Preferably in jQuery, but any JavaScript implementation will do at this point.


let $A \in {M_{n \times m}}$ why every real symmetric matrix has at least one real eigenvalue?                                                           .

Is there any proof of the fact that the eigenvalues of symmetric matrices (i.e. $A\in\mathbb{R}^{n\times n}$ with $A^t=A$) are real without the use of the concept of complex numbers?


I just noticed there are lots of really big pits in the starwars universe, some examples are:     Is there a reason?

Possible Duplicate:          Nearly everywhere in the Star Wars universe there are bottomless pits. (I'm referring to the universe portrayed in the movies.) None of them have railings and people keep falling into them. You'd think they'd realize this is a bad design, but apparently not.     Why are there so many bottomless pits in the Star Wars universe?


When doing password-based encryption, is it OK to create one instance of PBKDF2 from the password, and then use it to create both the AES key and the MAC key? (Or should a new instance of PBKDF2 be created using a different salt or iteration count, for each?)      seems to say this isn't a good idea. While    seems to say it is. Am I misunderstanding one of them? (Or both.)  (And by the way, the first is marked as a duplicate of a question which deals with an initially strong key, while it itself deals with a simple passphrase.)

When using Encrypt-then-MAC with AES and HMAC by password, and given 128 bits of payload with the ciphertext to store a random salt, which would be more secure:   Using PBKDF2 with then entire 128 bit random salt and generating 512 bits of derived data to split into a 256 bit AES Key and a 256 bit HMAC key.   or   Using PBKDF2 separately for each key using two 64 bits salts to generate a 256 bit AES Key and a 256 bit HMAC key.    or    Better option?


Someone I met told me he was in the military and was willing to give me “allowance” each week. But, his excuse was that he was not allowed to leave base so he had a “bank manager” that took care of all his money. So he asked me for my login credentials and said he’d deposit a check of $1600, I take $600 and send the rest back to somewhere he’s not even in.  I think he gave me a fake number, because I asked to talk to his bank manager and he only answers my texts.  Please just clarify the stupidity of this for me. Thanks.

I was recently talking to someone online and she said that she was in the Army and then she went on to tell me that she had a lump sum of 45,000$ co.i g to her but she needed my bank account routing number, asked for my social security number, and then told me that she was going to have the Army wire me the money into my account now my question;     Is this a scam?


I want a to be rounded to 13.95.  >>> a 13.949999999999999 >>> round(a, 2) 13.949999999999999   The  function does not work the way I expected.


I'm trying to get a user's activities around a certain date by a "half split" search on the user's activities tab (AKA all actions tab).    But consider . It looks like this:    But what year is that?  It should look like the following for anything not in the current year:        Note: I know that Desktop users can usually hover over the partial date to get a full datetime string. But, requiring that for such basic/crucial date info is:   It doesn't work with touch screens. Bad UI that makes it much more cumbersome to locate the right results. The text can't be highlighted or copied.

Here's :        At the moment, the latest entry there is October 13, which would be mistaken to mean October last year (2012), but it actually is October 2010. This applies to all the filters in the activity tab.


I'm looking for a music player similar to Winamp.

I've been thinking about switching to Ubuntu full time, but there are still some programs left behind that I haven't found any equivalent to yet. Does anyone know of a music player similar to Foobar2000 (I've read it doesn't handle well in WINE)?


Is there a term that describes someone who enjoys intellectual arguments, e.g. how physicists would like debating about theories they're working with or how people enjoy arguing over the meaning of a literary text? For example,      This student in my class is ____ - they get along with others while stimulating discussion.   Everything I've found so far seems to have negative connotations. Is there any word that has neutral or positive connotations?

I recently read somewhere a single word that described a person who enjoyed an argument - in the sense of a lively debate. It may have been a word implying a positive or neutral context but I don't think it was negative or derogatory.  A complex word (uncommon in colloquial use), medium length (7-8 letters), possibly ending in -ic. One or more of these points may be a false memory.  Any ideas?


I'm unable to see any icons or menubars on my desktop. However, I am able to open up the file/folder explorer by inserting a USB, which opens up the explorer and let's me open applications and files    However, some applications are visible without the menubar on top, i.e. I can't close them. Additionally, I cannot search for terminal- no results show up. I found terminal in my usr/share/app-install/desktop directory, but am unable to open it    I also can't open it using CTRL+ALT+T. So far, I've been able to work and open some files, folders, and applications, but the lack of icons is problematic. Any ideas as to what the problem is?  This is Ubuntu 13.10  -Thanks for reading

When I login, nothing happens.   I am presented with my desktop wallpaper.    No Dash, no Launcher, nothing.


I am reading Weinberg's QFT books. I wonder is there any course can help me with it.

I'm aware of Sidney Coleman's 1975/76 sequence of  on Quantum Field Theory. Are there any other high-quality QFT lecture series available online?


I do not know how to use professional words to ask my question, so I will try to use a layman language. Please bear with me for a moment.  A ROUGH GUESS  The world our eyes are seeing every moment is a picture reflected in our eyes. I guess our eyes are like cameras, that are taking pictures "continually". I suppose there is a frequency in this picture taking. Say it is 1/10000s, the time it takes a picture, let's assume it is negligible. Something like that.  THE QUESTION  My question is, if we take a picture at 0/10000s, 1/10000s, 2/10000s, etc. How do I know that between the time 1/10000s and 2/10000s, the world exists?  So now:   If my guess is wrong, then what is the real picture? What is happening in reality? If my guess is correct, how do we know the world exists continually? How would you use experimental methods to prove it? Or there might be theoretically, many worlds in our time gaps coexisting with ours?   EDIT  I feel I still have not got a satisfied answer for my first question. Could anyone explain to me: is our vision equipment (i.e., our eyes) functioning continually or discretely?

Is the spacetime continuous or discrete? Or better, is the 4-dimensional spacetime of general-relativity discrete or continuous? What if we consider additional dimensions like string theory hypothesizes? Are those compact additional dimensions discrete or continuous?   Are there experimental evidences of continuity/discreteness?  When particles move inside space do they occupy spacetime by little chunks? What would imply if spacetime is discrete on continuous theories?  I've found little information on the web and books.  Probably my question is ill-posed and I apologize for this.


I am an Indian passport holder travelling from KL, Malaysia to Lucknow, India via Singapore.  I have a multiple entry Singaporean visa and eNTRI from Thailand. My first flight (Jetstar) (KUL - SIN) arrives at 12:50. The outbound flight from Singapore to Lucknow is on the same day but from a different airline (Scoot). I have no check-in luggage and my outbound flight from (SIN - LKO) is at 16:00.  Will I have sufficient time to change the flights? Do I need to go through the immigration twice(for both inbound and outbound flights) in Singapore?   This is not a duplicate since I am asking about the Singapore airport in general and not only about the minimum connecting time. My question is about staying at the airside and taking the outbound flight(different PNR) without going through immigration.

Arriving in Singapore by Air India at 7:30 am at Terminal 2 and next flight is Air Asia at 10:10 am, is the connection time for 2:40 minutes sufficient,as will need to clear immigration at singapore also.


Sometimes when writing maths documents, I want to have the name of a theorem in a section heading. This works fine in the text of the document, but it runs into trouble in the PDF outline. Specifically, the name of the section in the outline contains the label of the theorem, rather than its actual printed number in the text. How can I get around this? In the MWE below, the offending section heading will print as "Proof of Theorem 1.1" in the text, but as "Proof of thmName" in the outline. I want it to also say "Proof of Theorem 1.1" in the outline. \documentclass{amsart}  \usepackage{hyperref} \usepackage{cleveref}  \newtheorem{thm}{Theorem}[section]  \begin{document}  \section{Introduction}  In this paper we prove the following result, which requires a bunch of lemmas to be given first.  \begin{thm}\label{thmName}     Some result. \end{thm}  \section{Required Results}  Here we give a bunch of lemmas.  \section{Proof of \cref{thmName}} % The offending section heading  We draw the lemmas together into a proof of \cref{thmName}.  \end{document}  I compile this with PDFLaTeX, and it seems this is a problem with hyperref. The warning I get from it is Token not allowed in a PDF string (PDFDocEncoding):(hyperref) removing `\new@ifnextchar' on input line 22   Update By following Jakob's answer , I've been able to get this working as follows: \documentclass{amsart} \usepackage{hyperref} \usepackage{cleveref} \newtheorem{theorem}{Theorem}[section] % Note that the environment is now named 'theorem' rather than 'thm'. \usepackage{crossreftools}  \pdfstringdefDisableCommands{%     \let\Cref\crtCref     \let\cref\crtcref } \begin{document}  \section{Introduction}  In this paper we prove the following result, which requires a bunch of lemmas to be given first.  \begin{theorem}\label{thmName}     Some result. \end{theorem}  \section{Required Results}  Here we give a bunch of lemmas.  \section{Proof of \cref{thmName}}  We draw the lemmas together into a proof of \cref{thmName}.  \end{document}  However, it absolutely requires me to name the theorem environment 'theorem' rather than 'thm'. If I do the above with \newtheorem{thm}{Theorem}[section] instead, all sorts of errors are thrown. Why would this be?

In the following MWE, the bookmark produced by hyperref is incorrect:  \documentclass{article}  \usepackage{hyperref} \usepackage[capitalize,nameinlink,noabbrev]{cleveref}  \hypersetup{%     bookmarksnumbered, bookmarksopen=true, bookmarksopenlevel=1,% }     \begin{document}  \section{\label{sec:foo}foo} \section{Code for \cref{sec:foo}} \end{document}   The heading of section 2 in the PDF is correct (Code for Section 1), but the bookmarks as shown in Acrobat read:  1 foo 2 Code for sec:foo   Edit: as Micha pointed out, the code also produces a warning:  Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding): (hyperref) removing `\@ifnextchar' on input line 11.   Using the allmighty \protect before the \cref unfortunately did not change anything ;).


$i.e.$ What are the subsets $H$ $\subset$ $\mathbb R$ such that all continuous function $f$ $:$ $H$ $\to$ $\mathbb R$ is uniformly continuous ?  Compact sets of course, but think about $\mathbb Z$ or more complicated subset.

This is an exercise from Thomson and Bruckner's "Elementary Real Analysis" (Exercise 5.6.5 page 239):     Let $X=\{x_1,x_2,\dots,x_n,\dots\}$. What property must $X$ have so that every function continuous on $X$ is uniformly continuous on $X$?   The set $X$ is a subset of $\mathbb {R}$. I worked on the $\varepsilon-\delta$ definitions of limits and uniform continuity, but I coudln't link between them. Could you please help me?  Edit: I removed the part My attempt because my result was wrong.


I've posted my fifth well-received question:    However, I still seem to be stuck on 4 out of 5 for the Curious badge:    Any idea what I've done wrong?  This question is different from , because that question pertains to having more than five well-received questions and still not getting the badge. In my case, I seem to have five well-received questions but Stack Overflow is telling me I only have four out of five.

I recently achieved a flag weight of 500 over on StackOverflow.  I am curious as to why that has not resulted in my earning the Deputy badge.  I realize that the description of the badge states that you must "achieve a flag weight of 500 by reviewing and flagging appropriately", but a fair number of my flags have not come directly through the review interface.  I tend to spend most of my time browsing the site for questions I can answer, and flagging questions and answers that I happen across that I think should be flagged.  Is this my problem?  Do I need to have spent my time actually in the review interface?


We are Indians and will be visiting UK on short-stay visas for about five months.  Can we apply for Schengen tourist visas while we are in London?

I am an Indian citizen holding a regular passport, can I apply for a Schengen visa from within the UK?


Many formulas in Special relativity have v - velocity. And theory says there is no absolute velocity only relative and it cannot be greater than speed of light.  Consider this thought experiment: Empty space, two asteroids A and B, are stationary relative to each other at very close distance. There is an astronaut on asteroid A, he kicks asteroid B and distance between asteroids begin to increase. Then astronaut takes a rock from his asteroid A and throw it in the direction of B, this gives some acceleration (momentum), he notice the distance between asteroids increase more rapidly now. So he continue to repeat  this process...  Does astronauts (A) velocity  relative to B =  change of distance between A and B per tick in special relativity?  Will astronauts (A) velocity relative to B exceed speed of light?  Special relativity states that objects with mass cannot have velocity greater that speed of light, so does it mean there are no such 2 reference frames in universe which move faster than C ? I'm pretty sure there are lots of rocks in universe whose distance change much faster than C.

I'm in a freshmen level physics class now, so I don't know much, but something I heard today intrigued me. My TA was talking about how at the research facility he worked at, they were able to accelerate some certain particle to "99.99% the speed of light". I said why not 100%, and I didn't quite understand his explanation, but he said it wasn't possible. This confused me. Since the speed of light is a finite number, why can we go so close to its speed but not quite?  Edit: I read all the answers, and I think I'm sort of understanding it. Another silly question though: If we are getting this particle to 99.99% the speed of light by giving it some sort of finite acceleration, and increasing it more and more, why cant we increase it just a little more? Sorry I know this is a silly question. I totally accept the fact we cant reach 100%, but I'm just trying to break it down. If we've gotten so close by giving it larger and larger acceleration every time, why cant we just supply it with more acceleration? And how much of a difference is there between 99.99% the speed of light, and the speed of light? (I'm not really sure if "difference" is a good word to use, but hopefully you get what I'm asking).


I just installed Ubuntu today and I went to the Ubuntu software center to install Adobe Flash player. And when the install button is pressed, I received the following message:  Package dependencies cannot be resolved This error could be caused by required additional software packages which are missing or not installable. Futhermore there could be a conflict between software packages which are not allowed to be installed at the same time.  Please help me.

Occasionally, when I'm installing stuff, I get an error like the following:  Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:  The following packages have unmet dependencies:  package1 : Depends: package2 (>= 1.8) but 1.7.5-1ubuntu1 is to be installed E: Unable to correct problems, you have held broken packages.   How can I resolve this?


Would you please merge my both accounts  and  or add them in a single profile? Thank you. Best I have also a stack exchange

I accidentally posted a question without being logged in. Is there a way to associate that question with my account?   For more information, visit "" in the .   a.k.a. How can you link a registered account to a cookie-based account? a.k.a. How do I merge an unregistered account with a registered account a.k.a. Merging users a.k.a. How do I associate anonymous questions I’ve asked with my registered account? a.k.a. Is there a way to claim an unregistered user? (in case anyone searches with those terms)


There are many types of plants which produce chemicals which can be beneficial in treating human illnesses, or at least alleviate painful symptoms.   Why would they do that?  Is it just random chance, like some plants being poisonous, some having no effect, and some having beneficial effects? However, for poison there are evolutionary benefits, as it might reduce the chance of animals eating the plant.  Many plant species produce tasty fruits for the purpose of having animals eat them and disperse the seeds. However, for most plants used for medicinal purposes, the leaves, roots or flowers are used, the cultivation of which doesn't seem to be useful for the plant itself.

Question  Quite a few plant species can be used for medicinal purposes . As an example, Filipendula ulmaria is rich in acetylsalicylic acid (aspirin).  An allele that produces a substance which is beneficial for a predator should not get fixed in the population! Why are there so many drug-like plants?    Thoughts  Here are some (intuitive, unclear or far-fetched, non-exhaustive and non-exclusive) hypotheses I can think of:   Because plants want their seeds to get ingested in order to propagate Is it because there are so many substances that affect our homeostasy that many plants are toxic and many are healthy just by chance. Containing healthy substances are not adaptations but by-product of evolution. The substances that are beneficial for us actually evolved to repulse predators. These substances are toxic at high dosage and therefore are efficient against predators that are small or eat a lot of plants (herbivorous). These substances at low dosage might actually have a benefical effect. For example a substance that make blood thicker is very toxic except if you eat just a bit of it while bleeding. We (primate or whatever taxon you want to consider) evolved in order to get advantage of the surrounding envirronment. Sbstances that were neutral became beneficial. The advantage of being sensitive to various products cause that, by chosing our food source, we can heal. Therefore, by evolving sentivity to various substances, our behaviour can act as a reinforcement to immunity (and other anti-illness system). If this is true, we might expect that the frequency of presence of a plant species affect the probability that out homeostasy get affected when eating it. Lineage selection. Lineages that produce substances that are active in predators body in a way or another are undergoing many various selection forces because of these substances. Therefore they get a higher speciation rate than other lineages. Keeping some non-herbivorous species in large population size (by helping them) is the best way to keep herbivorous species in small population (because of territory competition, predators relationships, etc... )


User Account Control keeps turning on by itself after I turn it off. How do I stop this? I don't have the Pro edition of windows so I don't have group policy editor. My windows user is an administrator, and it's not part of a network so my user settings are not controlled by a network administrator.

When I was running Windows 7 Ultimate 32-bit, I had UAC disabled and everything was working smoothly for me. Now I've updated to Windows 10 Pro 32-bit (and recently also the 2015-11 update), I'm having a few issues. Although I have UAC set to "Never notify" in Control Panel, I find that certain activities are still fettered by UAC. For example, Windows Explorer doesn't let me create a file in certain folders, such as C:.  I use the Command Prompt quite a lot. In Windows 7, with UAC turned to "Never notify", Command Prompt automatically started as Administrator; whereas under Windows 10 I have to explicitly right-click and choose "Run as Administrator". More annoyingly, when I connect to the Windows 10 machine from another PC, using NET USE with my username for the target machine, I don't have access to do anything in folders that need admin access. I haven't found a workaround for this.  Is there a way to completely turn off UAC in Windows 10, so that I can do all admin tasks easily?


Let $P(x)$ be a nonconstant polynomial whose coefficients are positive integers. If $P(n)$ divides $P(P(n) - 2015 )$ for every natural number n, then prove that $$P (-2015) = 0$$  I've observed that the proof depends on  $ P(n)$ divides $ P(P(n)-2015)-P(-2015)\,$ but I cannot see how to prove that. Could someone please elaborate on how to proceed.

Q. Let $P(x)$ be a non-constant polynomial whose coefficients are   positive integers. If $P(n)$ divides $P(P(n)-2015)$ for every natural   number $n$, prove that $P(-2015)=0$.   In one of the sources, the solution given is as follows: Note that $P(n)-2015-(-2015)=P(n)$ divides $P(P(n)-2015)-P(-2015)$ for every positive integer $n$. But $P(n)$ divides $P(P(n)-2015)$ for every positive integer n.   Therefore, $P(n)$ divides $P(-2015)$ for every positive integer $n$. Hence $P(-2015)=0$.  I am not able to understand that how $P(n)-2015-(-2015)=P(n)$ divides $P(P(n)-2015)-P(-2015)$. Please help me out.


Why is it that an assumption need not be discharged for the first implication introduction in natural deduction? For example, $$\dfrac{\dfrac{[p]^1}{q\to p}{{\to}\mathrm I}}{p\to(q\to p)}{{\to}\mathrm I^1}$$ Why is it q need not be discharged like p?

Apparently, according to the Conditional Introduction rule, this is valid:     Prove $C \to A$   Source:  Page 5  So before this, the way I viewed the CI rule, was that it allowed us to prove that if we assume the antecedent is true, we can prove the consequent can derived from the antecedent, by referring to the premises which lead to the consequent. If later we find that the antecedent is true, then we can conclude what we already done so before when we just assumed. So basically, sub derivations are inactive at first, but activated if the assumption of said sub derivation is confirmed.  In this example, it's basically stating that the mere assumption of some proposition is enough to state that it applies to some other already proven proposition. It's like you might as well skipped over the sub derivation and said, 'Given $A, C \to A$ because I want it to'.   Personally, I think this is a mistake, though if not, I can't see how you could justify that $C \to A$ given $A$ and assuming $C$ is true alone.


I have the option of undertaking a Coursera.org course in An Introduction to Interactive Programming in Python, which is stated to be eligable for a Fundamentals of Computing Specialization , which they state is a Verified Certificate. This certificate costs 50$ though, and even though I can and probably will take the course free, would this type of course be looked upon as something equivalent to a introductory comp. science course at the college level? Would it be resume worthy or am I just being "sold" something?   I am not trying to badmouth the people at Coursera, I am sure they have noble intentions, but I am a skeptic at heart. Here is a link to the course in question.

I took up an introductory course to forensic science in Coursera, because it was actually the only forensics course I could find that was accessible, however I do wonder if it is worth anything in my CV, as a student it is obviously better than nothing, but is this something good enough to show?  How does it compare to courses completed directly through MIT open courses, or those from another famous university? And if these are assets to a CV, if I go ahead to complete enough for a degree, how does it fare in comparison to the proper degree from the corresponding institution?


Is it possible to reference a value in one part of a stylesheet in another part? For example, say I want to set the CSS top value for a div with position:absolute to match the height of another element, is there a way to do that? Is it possible to say, in effect:  .div1 {     height: 50px; }  .div2 {     position: absolute;     top: <height value of div1> }

Possible Duplicate:          We have some "theme colors" that are reused in our CSS sheet.  Is there a way to set a variable and then reuse it?  E.g.  .css OurColor: Blue  H1 {   color:OurColor; }


What's the meaning of "to be use to +verb +ing"?  My doubt is if it can be used as the present of "used to" (habit or state in present), if it means to be able to stand an uncorfortable situation, or if both ways are ok.  I'll give two examples so you can analise:   I'm use to going to the beach at weekends. (I have the habit of going to the beach at weekends) I'm use to going to the beach by bus.  (though they are always full and take so long to get there)   In which case(s) is the usage of the tense correct, 1, 2, or both?  Thanks

Which is the correct sentence, if there is a correct one?     I use to be a hitman.        I used to be a hitman.   I've read the second sentence recently in a book, but I was sure it should be I use to be a hitman.


I have an app that just need to read from a database. I do not want to parse a big file in the app because it takes a lot of memory.  So is it possible to populate a database and ship it with the app?  Just parsing the file and storing it in the app the first time the app is run will not do since it will create the same memory problem.  An alternative would be to have the database on Google Appengine but I would like to avoid that because the app would be unusable if there is no internet connection and there are costs for the traffic.

If your application requires a database and it comes with built in data, what is the best way to ship that application? Should I:   Precreate the SQLite database and include it in the .apk? Include the SQL commands with the application and have it create the database and insert the data on first use?   The drawbacks I see are:   Possible SQLite version mismatches might cause problems and I currently don't know where the database should go and how to access it. It may take a really long time to create and populate the database on the device.   Any suggestions? Pointers to the documentation regarding any issues would be greatly appreciated.


What happens if I feel my bounty question is still unanswered but someone has answered it, but that answer is not the correct one and the time expires?

It's possible to offer and award bounties of reputation on questions.   What is a bounty? How can I find questions that have a bounty attached? How do I start a bounty? When can I start a bounty? Why is the system requiring me to choose a bounty amount that's higher than the minimum? Can I use Markdown formatting in the bounty remarks? Can I edit the remark? How long is the bounty period? How do I award a bounty? Can I award a bounty to my own answer? Can I award a bounty to an old answer? If I offer a bounty on someone else's question, can I award the bounty to their answer? After awarding the bounty, can I remove it or move it to another answer at a later time? What happens if there's no answer after the bounty period? What happens if I feel my question is still unanswered? What is automatic awarding? Are bounty awards exempt from the 200 points/day reputation limit? How does Community Wiki mode affect bounties? How does user deletion or post dissociation affect bounties? Can I award a bounty to an answer from a deleted user or one where the author was dissociated? Can I offer a second bounty after the first one has expired? Can I raise my bounty? What happens if a bounty question is closed or deleted? Why can't I vote to close or migrate a bounty question? What happens if I delete my account while I have an active bounty? Do I keep an awarded bounty when I delete my answer? What happens if a question where I awarded a bounty later gets deleted or migrated? Can I cancel my bounty? Can I affect / divide / share part of my bounty to two (or more) users? How many outstanding bounties can a single user have?      See also:  in the Help Center


to test a two way ANOVA do you have to test each sample for normality as well as normality for the residuals?

A former colleague once argued to me as follows:      We usually apply normality tests to the results of processes that,   under the null, generate random variables that are only   asymptotically or nearly normal (with the 'asymptotically' part dependent on some quantity which we cannot make large); In the era of   cheap memory, big data, and fast processors, normality tests should   always reject the null of normal distribution for large (though not insanely large) samples. And so, perversely, normality tests should   only be used for small samples, when they presumably have lower power   and less control over type I rate.   Is this a valid argument? Is this a well-known argument? Are there well known tests for a 'fuzzier' null hypothesis than normality?


The human colony has been on this planet for some time now and are hearing that more ships from Earth are on their way. They also have developed a weapon that puts a pretty good sized crater on the moon. The ship that's on its way is described as having to have drugs and graft and other unsavory parts of humanity on it just to allow the people to be able to 'live'. The colonists are not happy about it, for they have developed a little more utopiany way of life.   The story is 3rd person and 1st person story telling. Radio transmission tells of ships coming (actual space trip takes years), towards the end I think a young boy figures out the secret weapon (that puts crater on the moon).   I remember one moment in it where the natives are in a bar (they all generally pack pistols due to all the animals in the area) and one of the newcomers is hassling a woman and she says NO to him twice during his advances as he's a bit drunk and fresh off the ship, well before the third NO some native in the bar shoots him dead which is how they handle things, not necessarily violently but directly and finally.  I read this in the eighties and it seemed old to me at the time, paperback

I am looking for the title of a science-fiction book describing a colony (utopia) on another planet that has been established as a social experiment. The inhabitants had been brought up only by robots and therefore work perfectly as a society. I think there is no formal government and people work on what they are interested. If any catastrophe happens, they are able to form groups of specialists who react to the threat. Later there comes a group of outsiders who decide to join and live in the utopia. I am not sure, but author was probably Canadian.


On my multibooting old laptop when I trying to boot ubuntu its showing     BusyBox v1.21.2 (ubuntu 1:1.21.0-1ubuntu1) built-in shell(ash)      Enter 'help' for a list of built-in commands.      (initramfs) _   others os working fine.

I am running an HP pavilion dv6000 dual boot win7 and Ubuntu 12.04. (well, up until today).  After a reboot, the boot process drops to the BusyBox shell and I end up at the prompt:  BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash) Enter 'help' for a list of built-in commands.  (initramfs)   I've been researching others who have had this same problem, but haven't been able to find any of those solutions to work for me.  I tried the method described , and after the final command   mount -t ntfs-3g /dev/sda1 /root -o force   it does nothing and gives me another (initramfs) prompt.  I can boot to a live CD (USB) and get to a terminal, but it doesn't seem to do much good, as I can see the /dev/sda1 in the ls command, but it doesn't recognize it when I try to cd to it.  One more question: using the command fdisk -l how can I tell which mount point (sda1/sda2) is my windows partition and which one is Ubuntu?


The program LOIC (in the news a lot the last days) causes a lot of damage. What can I do on my server to prevent this kind of attacks? Auto-block ip when receive a strange connection? Because mostly it will be a single user.  Are there already solutions for this?

This is a  about DoS and DDoS mitigation.   I found a massive traffic spike on a website that I host today; I am getting thousands of connections a second and I see I'm using all 100Mbps of my available bandwidth.  Nobody can access my site because all the requests time out, and I can't even log into the server because SSH times out too!  This has happened a couple times before, and each time it's lasted a couple hours and gone away on its own.  Occasionally, my website has another distinct but related problem: my server's load average (which is usually around .25) rockets up to 20 or more and nobody can access my site just the same as the other case.  It also goes away after a few hours.  Restarting my server doesn't help; what can I do to make my site accessible again, and what is happening?  Relatedly, I found once that for a day or two, every time I started my service, it got a connection from a particular IP address and then crashed.  As soon as I started it up again, this happened again and it crashed again.  How is that similar, and what can I do about it?


I know that ESRI has  what other options are there for me as developer, if I'm about to develop GIS applications for an Android phone?

I am currently looking at the various libraries that I can use to show a map in my custom Android App. I have found several like Mapsforge, OSMDroid, ArcGIS runtime for Android, Google Maps for Android and so on. I'm sure that I am missing a few.   Is there a comparison chart somewhere about the differences in functionalities and pros and cons of each one?   If there isn't one, we could make this question community wiki, to serve alongside  & .