I want to add a feature to pam, and I figured a good starting point was to download the libpam-modules source. On download, I notice this warning: gpgv: Can't check signature: public key not found  What is the official method for verifying the integrity of source packages, when apt-get cannot find the public key?  The newest version of ubuntu-keyring and debian-keyring packages are installed already.  There are  to find the corresponding public key and install it. However that in itself does not provide integrity, because in effect it is trusting the contents of the dsc file to tell me which public key to use to verify the signature on the dsc file.  Is the gpg signature on the dsc file a critical part of the integrity verification? Could a man in the middle or a rouge mirror serve a malicious version of the file where the warning from gpg is the only indication something bad is happening? Or does apt-get have other means of validating the integrity?  Where would I find official documentation on the security model? Ideally I would like to understand the full trust path from the install image to the source package I am downloading.  The full output from the download was this:  $ apt-get source libpam-modules Reading package lists... Done Building dependency tree        Reading state information... Done Picking 'pam' as source package instead of 'libpam-modules' NOTICE: 'pam' packaging is maintained in the 'Bzr' version control system at: https://code.launchpad.net/~ubuntu-core-dev/pam/ubuntu Please use: bzr branch https://code.launchpad.net/~ubuntu-core-dev/pam/ubuntu to retrieve the latest (possibly unreleased) updates to the package. Need to get 2,043 kB of source archives. Get:1 http://dk.archive.ubuntu.com/ubuntu/ trusty/main pam 1.1.8-1ubuntu2 (dsc) [2,510 B] Get:2 http://dk.archive.ubuntu.com/ubuntu/ trusty/main pam 1.1.8-1ubuntu2 (tar) [1,893 kB] Get:3 http://dk.archive.ubuntu.com/ubuntu/ trusty/main pam 1.1.8-1ubuntu2 (diff) [147 kB] Fetched 2,043 kB in 6s (316 kB/s)                                               gpgv: Signature made Fri 31 Jan 2014 11:12:23 PM CET using RSA key ID 64792D67 gpgv: Can't check signature: public key not found dpkg-source: warning: failed to verify signature on ./pam_1.1.8-1ubuntu2.dsc

I was trying to recompile and rebuild libevent2 source from oneiric on my natty server and I had a small error with gpg not being able to check signature  # dpkg-source -x libevent_2.0.12-stable-1.dsc gpgv: Signature made Fri Jun 17 07:12:50 2011 PDT using DSA key ID 7ADF9466 gpgv: Can't check signature: public key not found dpkg-source: warning: failed to verify signature on ./libevent_2.0.12-stable-1.dsc   Any idea how to fix this warning?


I am looking for training app installed inside QGIS, which can be used for training purposes.      I mean, a plugin like an e-learning software than can drives you directly inside the QGIS software and can check your result automatically.      I looked under python plugin repository with tutorial or training keys but with no good result.      I think it should be better integrate with a C++ plugin or a specific QGIS standalone App than a python plugin, but I could be wrong.     I am also interest about project which use a kind of tutorial module, like step by step, with highlighting zone, mouse move, button action, setting parameters directly under QGIS.      If I am still not clear enough, this kind of app are usual on web, for e.g., when you launch openstreetmap editor on their website, there is a kind of "beginner tutorial". I would know if someone develop something similar under QGIS desktop, never mind if it's on a totally different way. it´s a kind of state of art about tutorial existing tools under QGIS.

I wish to develop a simple plugin for QGIS, which will open some data, and perform some specific processing.  I tried searching on the QGIS wiki, but only found this link :    which seems to be obsolete. There were also a few blog posts from 2006.  I also saw something about Python plugins, but I am not sure whether I need to work with the C++ plugin or a Python plugin.  Where can I find documentation, or tutorials, that would help me get started?


I have lost my admin rights and locked up my admin account. I am signed in with a local account without admin rights. I am unable to run any program with admin access and using "run as administrator". What should I do.

I got a brand new Windows 7 machine, installed the operating system, created one account and forgot its password. What can I do?  There is no external CD, the operating system is loaded from somewhere inside the machine.  I already tried to remember passwords and tried all candidates with all possible combinations of caps lock, num lock etc.


The aim of this question is to understand what the system prefers.  On Aviation it often happens that spam messages end up in the LQ queue and thus end up being "reccommended for deletion" but not flagged as spam. They end up deleted, but not recognized as spam from the system.  As a consequence, some users have started to edit away the spammy posts while they are in the queue.  Is this a good idea? I.e., does the spam prevention system like this? Or should we somehow prod more users into flagging the posts instead?

I noticed that the posts of the recent spam surge on Ask Ubuntu were all edited by community members into something like     EDITED - REMOVED SPAM ANSWER   or similar.  While I understand why the users have done this and I too don't want to leave the spam content visible for longer than absolutely necessary, it made flagging more time consuming for me.  I had to check the revision for every of those possible spam posts to check if it is actually spam, instead of being able to flag directly from the review site. Spam flags carry a serious penalty, I'm not willing to add my spam flag without checking that it's really spam.  I see the benefit of editing spam, but it also causes some more effort for the later flaggers. Should we as a general policy edit out the content of spam posts, or should we deal with them solely by flagging?


So I want to summon lapis using a command block in 1.12.2 But I don't know what ID it is. I tried Lapis lazuli and dye4 and dyeblue and bluedye and dye_4 and nothing worked.

In Minecraft, when cheats are enabled you can give yourself items using the command /give [user] [item] [count], e.g. /give user45623 dirt 32. What is the item name to use for Lapis Lazuli? I've tried lapis_lazuli, lapis, lazuli, dye4, and dye_4, but it's none of those.


Can please someone explain me the logic (not the behavior itself but the logic) behind the peculiar fact that access to protected class members, both methods and fields I believe, is allowed through inheritance only  i.e. by the reference of the child type – and not by the reference of the parent type where protected member was declared – in case child class is located in a different package ?  And what if both parent and child classes are in the same package, does call by inheritance is only allowed option as well?  Also why it's not allowed to access A's protected methods for another class (B) from a different inheritance tree (C)?

In Java, are there clear rules on when to use each of access modifiers, namely the default (package private), public, protected and private, while making class and interface and dealing with inheritance?


I write about the card game bridge, so I need to automate this formatting all the time:  Find all "♣" and color the text green (#00b700). Find all "♦" and color the text orange (#ff8100). Find all "♥" and color the text red (#ff0000). Find all "♠" and color the text blue (#0000ff).    .  @Mark built me a script to do this, but I'm getting this error:     "TypeError: Cannot find function setFontColor in object Text."

How can I automate a find & replace function to change the font colour of all suit symbols document wide?  I write bridge articles (card game), and I need to automate this formatting constantly:  Find all "♣" and color the text green (#00b700). Find all "♦" and color the text orange (#ff8100). Find all "♥" and color the text red (#ff0000). Find all "♠" and color the text blue (#0000ff).  Answered: Mark and Michael helped build Google Apps Scripts to do this (see below). .


Assume for all finite $r>r_0$ that   $$\lim_{n\to\infty}\mathbb{P}(\mathcal{A}_{r,n})=0,$$   where $\mathcal{A}_{r,n}$ is an event on some random variables, and $n$ and $r$ are deterministic variables. How to prove the following?   $$\lim_{n\to\infty}\mathbb{P}(\lim_{r\to\infty} \mathcal{A}_{r,n})=0.$$   This is a part of a bigger problem. I need to prove the second equation but I have proved the first one. Is the second equation always true? If yes, how can I prove that?

Assume for all finite $r>r_0$ that   $$\lim_{n\to\infty}\mathbb{P}(\mathcal{A}_{r,n})=0,$$   where $\mathcal{A}_{r,n}$ is an event on some random variables, and $n$ and $r$ are deterministic variables. How to prove the following?   $$\lim_{n,r\to\infty}\mathbb{P}(\mathcal{A}_{r,n})=0.$$   This is a part of a bigger problem. I need to prove the second equation but I have proved the first one. Is the second equation always true? If yes, how can I prove that?


I have downloaded the Ubuntu (desktop) ISO file and copied it to a USB drive. When I try to boot from it, I get a disk error. When I try to open the file within Windows, it launches my CD Burning program.   I have a 386 machine (IBM Thinkpad) running XP.

I am looking at this:    I need to create a boot disk to test Ubuntu to make sure it will run on a PC (Compaq Mini CQ10-120LA) I was given. I can create the boot disk off of a Mac (in English) or Windows (but Windows is in Spanish and foreign to me).   Questions:     What format do I choose for the USB stick? (I wish the instructions stated this). What is Dash? (Will I know when I run the installer?) Can I do this from a Mac or Windows computer? Or only from Ubuntu?


I am trying to show:  If $(x_n)$ converges to $a>0$ and $x_n>0, y_n \geq 0$ then $\lim \sup (x_n y_n) = a\lim \sup y_n$. But have not been able to make much progress.  I can show that if $p$ is a limit point of $a(y_n)$ then it is a limit point of $(x_n y_n)$ but I cannot show the converse of this, which would complete the proof. Any hints?

I´m not sure how to start with this proof, how can I do it? $$ \limsup ( a_n b_n ) \leqslant \limsup a_n \limsup b_n  $$ I also have to prove, if $ \lim a_n $ exists then: $$ \limsup ( a_n b_n  ) = \limsup a_n \limsup b_n  $$ Help please, it´s not a homework I want to learn.


Let be $A$ the set of integers non-negative which only have 1 in their base 10 expansion (e.g. $111111$, $11$, $1$).  I would like to find all polynomials $P \in \mathbb{C}[X]$ such that $P(A) \subset A$.  My intuition is that: only $P_k = 10^k X + \sum_{i=0}^{k - 1} 10^i = 10^k X + \dfrac{10^k - 1}{9}$ for all $k \geq 0$ are solutions.  But I'm not sure how to proceed.  I tried to let be $(u_n)_n$ the number with $n$ $1$ in its base 10 expansion, e.g. $u_n = \underset{n \text{ 1s}}{111111111\ldots111} = \dfrac{10^n - 1}{9}$.  And I know there is $(k_n)_n$ such that $P(u_n) = u_{k_n}$ by hypothesis.  Also, I know, for all $k \geq 0$, there is $j \geq 0$ such that:  \begin{equation*} 9P\left(\dfrac{10^k - 1}{9}\right) = 10^j - 1 \end{equation*}  Of course, such a polynomial must be in $\mathbb{Q}[X]$ by interpolation.  I would be tempted to try to evaluate $P(0)$ and use it to guess the good $k$ and show that it must be equal to $P_k$ over an infinite set (maybe asymptotically?).

Find all polynomials $ f$ with real coefficients such that if $ n$ is a repunit, then so is $ f(n).$  [Note this is a Putnam question, so it is intended to be of easy to middling difficulty as contest problems go.]


I'm trying to create a mixture of maps that will load in depending on zoom level However, it will only show as one map to the user, and depending on the zoom level, it will load in a different map  I really like open street map data when zoomed out, and skobbler maps when zoomed in, so would like to create this one combined map  I think from what i've read its possible, but all the examples i found refer to detail layers   any examples or pointing in the right direction would be appreaciated

I have a  which overlays Open Street Map data on imagery for Pennsylvania. As a baselayer to the roads (and eventually other layers) I have two baselayers - Blue Marble NG and USGS EROS 1ft imagery. I would like to be able to combine these two layers into a single base map object that switches automatically as the user zooms in since it makes no sense to view the 1ft imagery for the whole state or the Blue Marble imagery when you are zoomed in.   Ideally I'd like to do this on the client side as I'm pulling the imagery from two different sites.


I am trying to import pandas 0.20.3 in QGIS console but it's giving me this error. Could any one help me to solve this problem. I used pip to install pandas in windows and QGIS version is 2.14

has anybody been successful getting pandas to work with QGIS's Python installation, on Windows? I've used the OSGeo4W installer to install QGIS2.2, which comes with Python 2.7 and Numpy 1.5.1. Any reasonably new version of pandas requires Numpy 1.6.1 or newer. So that seems like my main problem. I've tried: - Building an older version of pandas (e.g. 0.7.3 and 0.4.1) using easy_install, but that gives me a very long list of errors, at least the last of which are related to distutils\msvc9compiler.py - Using binaries of old pandas versions, but they are all built for Numpy 1.6.1 - Upgrading Numpy, which also gives me an error message. In case anybody is interested, the message ends with "File “C:\OSGeo4W\apps\Python27\lib\distutils\msvc9compiler.py”, line 299, in query_vcvarsall” newline “raise ValueERror(str(list(result.keys())))” newline “ValueError: [u’path’]"  I'm wondering if anybody else has ever been successful in getting pandas to work with a QGIS install on Windows??  It would be so easy if QGIS would ship with, say, a version of Numpy that's less than three years old. Does anybody know if such an upgrade is in the works for upcoming QGIS versions?


I am successful in extracting data into .csv from data extension to ftp location using Data Extension Extract API. The issue I am facing here is extracted .csv file is having some other Encoding type and I need only UTF-8 encoding. Just a quick note is I am not using any GUI, I am using SOAP API for Data Extension Data Extract. Can anybody please help me with this issue ? Data Extension Data Extract :

I'm having problems trying to export a data extension from Salesforce Marketing Cloud to FTP.  I created an Automation to extract this file, but I want to extract in UTF-8, my database only import files in this format.  So, how can I convert my data extract to UTF-8, instead of UTF-16?  I've tried to add a new Data Extract Activity, using ExtractType: Custom UTF-16 to UTF-8 Encoding. But that it isn't working, occur an error in this activity. I've fund that some guy did a , but I can not find that option in my Salesforce Marketing Cloud Business Unit.


When I try to open my .qgs file I get the following error:   It says that the project can't be opened, and that something is wrong when trying to read the project file, this is my translation.  Can I do anything to "fix" the file so I can open it?  No, I have no backup, just a .qgs~, does that help? I use QGIS 2.12.1 and Windows 10, and the file I'm trying to open is also made in 2.12.1.

My computer will not open a project i have been working on for weeks! it is coming up with an error of      Project file read error: unexpected end of file at line 1 column 1 for   file C:/Users/xxxx/Documents/Nxxxx/Exxxx.qgs   Is there anyway to get it back?


Hello, I've been programming for 3 weeks and this is my first milestone project.  I was trying out a template for an interactive tic-tac-toe game. What I want to do is format the empty board with X's and O's from a list that is filled by user input.  emptyboard = """     {1} | {2} | {3}     ____|_____|____     {4} | {5} | {6}     ____|_____|____     {7} | {8} | {9}         |     |""" print(emptyboard) print(emptyboard.format(["#","X","O","O","O","O","X","X","X","X"]))   And I get an IndexError, yet I think that I have enough values in both my table and string formatting method. Output:      {1} | {2} | {3}     ____|_____|____     {4} | {5} | {6}     ____|_____|____     {7} | {8} | {9}         |     | --------------------------------------------------------------------------- IndexError                                Traceback (most recent call last) <ipython-input-22-4c3674aa4a8b> in <module>       7         |     |"""       8 print(emptyboard) ----> 9 print(emptyboard.format(["#","X","O","O","O","O","X","X","X","X"]))  IndexError: tuple index out of range   Thanks in advance to everyone who tries to help! I will look up other ways of coding the game, but I'm just curious what my mistake is!

I want to do something like String.Format("[{0}, {1}, {2}]", 1, 2, 3) which returns:  [1, 2, 3]   How do I do this in Python?


Like on for example a header, would having only icons be confusing for the user, or would having words and icons take up too much space? I think that the icon only design is really clean, but don't know if the users would know what the icons mean.  Here is an example of what I am talking about

Are there any rules on when to use icons vs. icons with text vs. just text links in a web application?  For example:    vs.   save  vs.  save    Extra question: Is  save -or- save  preferable?


The question is quite simple: if $\mathbb{V}$ is a vector space and $B$ and $B'$ are basis for $\mathbb V$, then do $B$ and $B'$ have the same cardinality?   I've tried to answer the question as follows: suppose that $B'$ is bigger than $B$. Then there is a map $f:B'\to B$ surjective but non-injective. Extending this to a linear map $f':\mathbb V\to\mathbb V$ we have that $\mathbb V/\ker f'\cong \mathrm{Im} f'=\mathbb V$, with $\ker f'$ being non-trivial. But is this really a contradiction? (of course it is in finite dimension, since we know that all basis have the same cardinality in that case, but this is exactly what we are trying to prove here...)

I am having a difficulty setting up the proof of the fact that two basis of a vector space have the same cardinality for the infinite-dimentional case. In particular, let $V$ be a vector space over a field $K$ and let $\left\{v_i\right\}_{i \in I}$ be a basis where $I$ is infinite countable. Let $\left\{u_j\right\}_{j \in J}$ be another basis. Then $J$ must be infinite countable as well. Any ideas on how to approach the proof?


I have a static sqlite db. How could I include it into the app? Where should i put it in my project folder? How should I access it from DatabaseHandler?  Everything I found on the web was using sqlite only for creating a new db and storing user or temp data in it, but not using existing db with predefined data.   does not tell how to do that.

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.


I am out of hints here. Its trivial to show $1$ is a solution. How to show it's the only solution?  Can someone please give me some hints?  Please do not use congruence, limits or derivatives because they are out of scope of the chapter which has this question.

If $n>1$ is an integer, then $\sum \limits_{k=1}^n \frac1k$ is not an integer.  If you know , then you know there must be a prime $p$ between $n/2$ and $n$, so $\frac 1p$ appears in the sum, but $\frac{1}{2p}$ does not. Aside from $\frac 1p$, every other term $\frac 1k$ has $k$ divisible only by primes smaller than $p$. We can combine all those terms to get $\sum_{k=1}^n\frac 1k = \frac 1p + \frac ab$, where $b$ is not divisible by $p$. If this were an integer, then (multiplying by $b$) $\frac bp +a$ would also be an integer, which it isn't since $b$ isn't divisible by $p$.  Does anybody know an elementary proof of this which doesn't rely on Bertrand's Postulate? For a while, I was convinced I'd seen one, but now I'm starting to suspect whatever argument I saw was wrong.


How do I approach this question?   We know that $A$ is an ideal of $R$ and $r-s \in A$ where $r, s \in A$. Now, where do I go from here?

How to go with proving this : Let $R$ be a ring and let $I$ be an Ideal of $R$.  Prove that the factor ring $R/I$ is commutative iff $rs-sr \in I$ $\forall r$ and $s$ in $R$  any hint how to go with this...


I've heard both used interchangeably with regards to object-[oriented/orientated] programming. What's SE's opinion on it?

What are the origins of the word orientated?  As far as I know, the correct spelling is oriented and orientated is not an alternative spelling but an error that is in common use.  Is it for example more commonly used in a certain country or by a certain people? Is there a reason for people choosing to say or write orientated instead of oriented?


Salesforce is phasing out the use of arbitrary HTML on Home Page Components.  I have used CSS or JS solutions to hide the Chatter Feed from within a HTML Home Page Component.  This allows a more completely customized Home Page solution.  ()  After Summer15 the only available component for customizing the home page will be a VF page - that will be nested in an iFrame.  This makes it impossible to include code that affects the rest of the page - like the chatter feed.   Any ideas on retaining this capability?

Reading through this doc:      We replaced the rich text editor in HTML Area home page components   with a new version that supports more markup but doesn’t allow HTML to   be manually entered.      In Summer ’15 we will start removing unsupported code from HTML Area   home page components. As a result, components that contain JavaScript,   CSS, iframes, or other unsupported markup might stop working properly.   To use JavaScript or other advanced HTML elements in your home page   component, we recommend that you use a Visualforce Area component   instead.   With Visualforce homepage component the best we could do is design fancy home page components, which has not been the big use of sidebar amongst developers. How do we do the fancy hack we do today using html components since visualforce is hosted in a different domain will the sidebar hacks even work after summer 15?     You can include JavaScript in your Visualforce page, but because the   component is rendered in an iframe on the home page layout, the   JavaScript can’t interact with the page that contains the component.   Finally why this move :(?


Everyone knows that racing bikes have narrower wheels and that, by definition, friction reduces speed. What I don't understand is that since at no time is the wheel of the bike in horizontal motion relative to the road, surely any friction between the wheel and the road will have no negative effect and in fact aid the forward propulsion of the bike as a whole?

I know there are a lot of questions about rolling friction, but I couldn't find any that addressed my specific problem.  Note the following picture where the wheel rotates clockwise. The rolling friction force $\vec{F}_R$ points in the same direction as the rotation.   Normally, rolling friction inhibits the movement (speed $\vec{v}$) of the system. However, since the force is pointing in the "backward" direction, it looks like it is increasing the speed of the wheel. Therefore, it should accelerate the system. This seems unintuitive to me. Can someone please clarify this contradiction?   Thanks!    Update:  Based on the comments and answers, I have reconsidered the diagram and terminology. I mean rolling resistance and no static friction. The deceleration force caused by deformation (and other reasons). In the diagram above, this force is divided into its x- ($\vec{F}_r$) and y- ($\vec{N}$) components.  $\vec{v}$ is not independent of $\omega$ for pure rolling, since $v=R\cdot\omega$. To me, it looks like the resistance $\vec{F}_R$ that slows down the system accelerates $\omega$. And because of the kinematic connection between $\omega$ and $\vec{v}$, the latter must also increase. That's illogical, but I don't understand the reason. Maybe some comments or answers have already addressed that, but I don't understand :( This is really confusing.


Find Value of      $$I=\int _{0}^{\frac{\pi}{4}} \sqrt{\tan x}{\sqrt{1-\tan x}}\,\mathrm dx$$   My try:  Use substitution $\tan x=\sin ^2y$ we get  $$\mathrm dx=\frac{\sin 2y}{1+\sin^4y}\,\mathrm dy$$ we get  $$I=\frac{1}{2}\int_{0}^{\frac{\pi}{2}}\frac{\sin^2 2y}{1+\sin^4y}\,\mathrm dy$$  any way to continue now?

How to evaluate the following integral $$\int_0^{\pi/4} \sqrt{\tan x} \sqrt{1-\tan x}\,\,dx$$ It looks like beta function but Wolfram Alpha cannot evaluate it. So, I computed the numerical value of integral above to 70 digits using Wolfram Alpha and I used the result to find its closed-form. The possible candidate closed-form from Wolfram Alpha is $$\pi\sqrt{\frac{1+\sqrt{2}}{2}}-\pi$$ Is this true? If so, how to prove it?


I started wondering why floating numbers sometimes behave in such a strange way. I found out that it is because a number has to be represented with either 32 or 64 bits, so at some point the number needs to be simplified and rounded up.  So I experimented a bit on Python to get a better idea of how floats behave:  1-0.000000000000000001 == 1 returns True as expected.  However 0.000000000000000001 == 0 and 0.9999999999999999 == 1 return False.   Remarkably 1-0.000000000000000001 == 0.9999999999999999 also returns False  Is there something I am missing?

Consider the following code:   0.1 + 0.2 == 0.3  ->  false   0.1 + 0.2         ->  0.30000000000000004   Why do these inaccuracies happen?


I have a big text file with 'Terms' and its 'Definition' separated by spaces(variable). I want to use it in fortune cookie format.  Current file format:  **term1**     this is my definition with occasional(
,/,e.g., ; etc symbols) and some are way longer **term2**  this is my definition with occasional(
,/,e.g., ; etc symbols)   I want to transform it to the following format  **term1** : this is my definition with occasional(
,/,e.g., ; etc symbols) % **term2** : this is my definition with occasional(
,/,e.g., ; etc symbols) %   maybe with some sed or awk (I'm not good in either one)  please help.

How can I create a fortunes file and add it to the fortune* command on the shell?  *Fortune - "console command to print a random, hopefully interesting, adage."


I have a number of systems but have TTL flash only on one system. On another system, I use a non-TTL flash (generic) flash in either auto or manual mode. Past experience tells me that using a generic flash in the auto mode is very cumbersome, what with the zoom, aperture and so on.   So I'm thinking if we could build an easier rule of thumb to use in the manual mode for daylight fill based on the guide number of the flash, similar to the sunny 16 for correct exposure on a sunny day. On a sunny day, the backlight or side light must have similar luminance (otherwise Sunny 16 wouldn't stand), and the fill to lift a shadow on the subject's face should be of similar output as well. So, for example, if you needed 50% of the output of a GN 20 flash to nicely lift shadow on a sunny day with the subject 5 meters away at f/4, for this exercise, the GN sufficient to lift shadow on a sunny day is 14. If I had a GN 28 flash, I can accordingly increase or decrease the flash compensation based on the distance and aperture. (So, for example, if the distance to subject is still 5 meters at f/2.8, I can knock down the flash level to 1/8.)  So the question is, what's the amount of light (in terms of GN) necessary to lift shadow on a sunny day at a given distance and given aperture?  If we have that number, we can build our own rule of thumb for our respective flash. Has anyone tried to come up with this kind of rule of thumb for manual daylight fill?

My main flash is a Nikon SB-24, used on a Nikon D200. Hence, iTTL doesn't work. I've had no issues using A-mode (the thyristor in the flash determines flash output) or M-mode (manual on the flash) when shooting indoors, but I'm wondering how to use it for fill outdoors?   Are there some simple rules I can use to determine the settings for fill?


Ubuntu tells me there is an upgrade when I boot and starts the install process but then I get an error message -  The required dependency 'apt(>=1.0.1ubuntu2.13)' is not installed. How can Install or recover this and continue with the upgrade please? Thanks. Matt.

(This question was not resolved. Due to time constraints Computer was restored to factory settings.)  I was attempting to upgrade from 14.04 to 16.04, but apt threw this error:  The required dependency 'apt (>= 1.0.1ubuntu2.13)' is not installed.   What does this mean, and how can I fix it?  When I type in the command apt-cache policy apt  Shageenth@shageenth-Inspiron-3451:~$ apt-cache policy apt apt: Installed: 1.0.1ubuntu2.11 Candidate: 1.0.1ubuntu2.11 Version table: *** 1.0.1ubuntu2.11 0 100 /var/lib/dpkg/status 1.0.1ubuntu2 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64  Packages   The error happens when I run the command:   sudo do-release-upgrade -d   and it produces the following:  Checking for a new Ubuntu release Get:1 Upgrade tool signature [198 B] Get:2 Upgrade tool [1,265 kB] Fetched 1,265 kB in 0s (0 B/s) authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg' extracting 'xenial.tar.gz'  Reading cache  Checking package manager Reading package lists... Done Building dependency tree Reading state information... Done Building data structures... Done  Required depends is not installed  The required dependency 'apt (>= 1.0.1ubuntu2.13)' is not installed.


Which one is correct?   Their quitting on you is their loss. Them quitting on you is their loss.

The rule says that we can use a possessive adjective or an object pronoun before a gerund. Is there a rule  that says when to use each or are they interchangeable? Some say that it's wrong to use an object pronoun before a gerund.


I've seen many answers to this issue like this:  if (typeof(navigator.mimeTypes["application/x-skype"]) == "object") {      return true; }  else return false;   But it doesn't seem to work, I have skype installed in my PC and in my android, and both return false.  I tried to find, and skype doesn't have any mimetype register. Is there another way to verify?  Thanks :)

Is it possible for some Javascript to detect whether Skype is installed or not?  The reason I ask is that I'd like to change a link's href based on that: if Skype isn't installed, show a popup explaining what Skype is and how to install it, if it is installed, change the link to skype:my.contact.name?call so the click will start a call. Real estate issues means that I'd prefer to only have one link shown.


Does the  have a  for some "chaotic" values of the parameter?

Background:  Currently I am studying a course on non-linear dynamics. We have been studying about attractors only intuitively, so I do not have a definition for an attractor. Let me give you a couple of examples.  Consider a problem where a ball is slipping in a parabolic valley. It is clear intuitively and quantitatively that the lowermost point of the parabola is the attractor for it.   Say we are talking about a . We may not guess intuitively that there is an attractor, a priori, but using simulations for different values of initial conditions, we may qualitatively (and maybe quantitatively too) compare the trajectories for different initial conditions and convince ourselves that we have an attractor.  Problem:  Consider the  given as   $$x_n = ax_{n-1}{(1-x_{n-1})}.$$  Let us fix a value of the parameter where we "know" that the logistic map exhibits chaos. Say $a=3.9$.  Let us take the definition for the term attractor from :  An attractor is a subset $A$ of the phase space characterized by the following three conditions:   $A$ is forward invariant under $f$: if $a$ is an element of $A$ then so is $f(t,a)$, for all $t > 0$. There exists a neighborhood of $A$, called the basin of attraction for $A$ and denoted $B(A)$, which consists of all points $b$ that "enter $A$ in the limit $t → ∞$". More formally, $B(A)$ is the set of all points $b$ in the phase space with the following property: For any open neighborhood $N$ of $A$, there is a positive constant $T$ such that $f(t,b) ∈ N$ for all real $t > T$. There is no proper subset of $A$ having the first two properties.   How might we demonstrate/convince ourselves of/disprove the statement that the logistic map does have an attractor for a particular choice of the parameter at which the map exhibits chaos?


Here is one while loop that will iterate 11 times.  public static void main(String[] args) {             int count=0;         while(count<=10){                    System.out.print(count);             count++;         }        }   & the output will be definitely : 012345678910  But I want to display the same output in such a way that every iteration will overwrite the previous value while printing the value on console.   Here's the restriction is : We can not use file.  clearing the console on every iteration can be one of the ways, is there anything left we can do?

How can I return to the start of a line and overwrite what has already been output on the console? The following does not appear to work:  System.out.print(mystuff+'\r');


Let $M$ be a metric space with metric distance function $d(x, y)$, for $x, y \in M$. Assume that $M$ has only a countable or finite number of points, and assume that $M$ is connected.  Fix some point $a \in M$. Prove the function $f: M \to \mathbb R$ defined by $f(x) = d(a,x)$ is a continuous function on $M$.  I am having trouble with this proof. I am thinking that I should compare it to a Lipschitz function using the triangle inequality, but I am not sure if that is right.

The question is (from Topology without tears) that: Let $(X,d)$ be a metric space and $\tau$ the corresponding topology on $X$. Fix $a \in X$. Prove that the map $f:(X,\tau) \rightarrow \mathbb{R}$ defined by $f(x) = d(a,x)$ is continuous.  My first attempt was that let an open ball, $B_{\epsilon}(a)\subset \mathbb{R}$ and show that $f^{-1}(B_{\epsilon}(a)) \subset \tau$. Since $f(x) = d(a,x)$, $f^{-1}(B_{\epsilon}(a))=B_{\epsilon}(a) \in \tau$.   I am pretty sure the last sentence is wrong. I am not sure if every open ball is an open set in topology induced by metric space.  Please give me some hint and direction. Thanks


EDIT 1:  is the full code, including .tex and .bib files. Any help?  I'm trying to write an article, but all day I've been compiling and always everything goes wrong. I wrote a little code for the example:  \documentclass[10pt,a4paper]{article} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage[ backend=biber, citestyle=authoryear-comp, bibstyle=authoryear,         giveninits=true,             maxcitenames=2,              uniquelist=false,            sorting=ynt,                 sortcites,                   maxbibnames=99,  url=false, eprint=false, dashed=false,                ]{biblatex} \addbibresource{References.bib} \begin{document}  \section{Introdução} \parencite{Paerl2009} \parencite{Pantelic2013} \end{document}   The references are stored in the References.bib  @Article{Paerl2009,   author   = {Paerl, H. W. and Huisman, J.},   title    = {Climate change: a catalyst for global expansion of harmful cyanobacterial blooms},   journal  = {Environmental Microbiology Reports},   year     = {2009}, }  @Article{Pantelic2013,   author   = {Pantelic, D. and Svircev, Z. and Simeunovic, J. and Vidovic, M. and Trajkovic, I.},   title    = {Cyanotoxins: characteristics, production and degradation routes in drinking water treatment with reference to the situation in {Serbia}},   journal  = {Chemosphere},   year     = {2013}, }   Always when I compile, I get     File ended while scanning use of \field. \begin{document}   Any hint whats going on?

This question is basically a duplicate of , however the accepted solution (biber configuration file set to skip the abstract field entirely) does not satisfy me and the question is a bit old so maybe something changed.  On the one hand, I would like to be able to use the abstract field if needed; on the other hand, export tools of some editors routinely include an unescaped "%" in abstracts. Is there a way around this that does not involve replacements in .bib files by hand or by an external software?  (BTW, I fail to see how biber can skip the abstract field even if it contains a "%", which proves that at some point it is not in LateX-mode of "ignore the comments", but cannot escape it reliably - that's purely for curiosity, but since I'm asking...)  MWE if needed: (the first pdflatex and biber compilations will work, for a successive pdflatex will fail with "Runaway argument?")  \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage[english]{babel} \usepackage{filecontents}  \begin{filecontents}{biblio.bib} @article{key1,     author="Ann Onymous",       journal="Some journal",       title="Title",       year="2017",       abstract={This abstract will fail because of an unescaped percent sign:         10\% is fine, 10% is not.},       } \end{filecontents} \usepackage[backend=biber]{biblatex} \addbibresource{biblio.bib}  \begin{document}     Citation: \parencite{key1}.      \printbibliography \end{document}


(the) Security forces helped us fight (the) terrorists.   If I wanted to refer all security forces in a specific country would I need to use a definite article? Same with "the terrorists", I want to make clear that the security forces are fighting not all terrorists but a few groups of terrorists; would I have to use the definite article then?  The question this is supposed to be a duplicate of talks about generic noun phrases. This means things that do not actually exist in the world (you can't feed or take a photo of a generic lion, for instance). I am talking about noun phrases (security forces, terrorists) that actually exist and fight and die in a specific country. We can feed and and photograph them. They are "real," not generic.

This is intended as a generic statement:     *A madrigal is popular.   This means that being popular is a requirement for being a madrigal.    ...of course this conclusion is wrong, so I've marked the example with a star.     *A tiger is in danger of becoming extinct.       The tiger is in danger of becoming extinct.      Tigers are in danger of becoming extinct.      The Indefinite Generic a tiger is ungrammatical with the predicate become extinct, because that extinction can only happen to a species, and it means that every member is dead. In contrast, we we can use the Definite Generic because the predicate is characteristic of the species. We can also use a Plural Generic because we're speaking of tigers in aggregate.   I read those examples and explanations in a grammar book (or, more likely,  ).  Would anyone please explain those in a more simple way, so that I could get it? I cannot tell what the explanations mean very well.  Or could you possibly explain that with another example that is easier to understand?


I've had questions that I've asked be edited into an entirely different question and thus receive irrelevant answers. Is there any way to prevent others from editing my questions without permission?

I would say a quarter to half my questions end up getting edited the vast majority of which end up dramatically changing the context of my question. I'm not against good advice (I've acted on about 2% of all the criticisms I have ever had about my work since they were actually thoughtful) though I think since I joined overflow sites years after I've had a good grip on most of the material I work with people are seeing low reputation and presuming that equates to low levels of comprehension.  Regardless of the reasoning behind people making edits is there an option I can use that would require my approval in order to commit an edit to my questions?   I have no interest in spamming questions in order to artificially boost my reputation. I am getting tired of having to add bullet points telling people to ask for clarifications instead of editing my posts. Having to correct my posts so often reduces my desire to ask the question if I have to review the question again (even with the revision pages available). As this is a discussion there is no reason to edit this post, I will be happy to revise my own if you leave comments as I actively follow questions I participate in though the office of redundancy redundancy requires that I state I know what I am asking.   For example, say I post about Kubuntu (which by default uses KDE) and someone edits it changing the OS to Ubuntu (which uses Gnome by default). Then, answers become Gnome-oriented for a KDE question and the entire context has been changed--negating the point of asking the question in the first place.


Am trying to connect remote host by using ssh:  ssh xxxx@hostname.    It will connect by asking password.  But I need to connect host with out password.

I generated a key and copied it to my target:  ssh-keygen ssh-copy-id username@hostname   I left the the location of the key as default and did not set any passphrase.  For a small while after that, I was able to ssh username@hostname without being prompted for a password, and then it stopped working for some reason.


I have tried several alternatives from answers to similar questions (,  and ) (see also below) to get the libraries I need. It still doesn't work and I get this error message when trying to run my 32-bit software on my 64 bit system (Lubuntu 15.10):  $ ./aiStarter: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory  [1]+  Exit 127                ./aiStarter   So this is what I've tried:  $ sudo dpkg --add-architecture i386  $ sudo apt-get install libstdc++6:i386 Reading package lists... Done Building dependency tree        Reading state information... Done The following package was automatically installed and is no longer required:   libc6-i386 Use 'apt-get autoremove' to remove it. The following extra packages will be installed:   gcc-5-base:i386 libc6:i386 libgcc1:i386 Suggested packages:   glibc-doc:i386 locales:i386 The following NEW packages will be installed:   gcc-5-base:i386 libc6:i386 libgcc1:i386 libstdc++6:i386 0 upgraded, 4 newly installed, 0 to remove and 1 not upgraded. Need to get 4 537 kB of archives. After this operation, 12,0 MB of additional disk space will be used. Do you want to continue? [Y/n] Y    #Answered yes, etc...  $ sudo apt-get install package:i386 Reading package lists... Done     Building dependency tree        Reading state information... Done E: Unable to locate package package  $ sudo apt-get install build-essential:i386 Reading package lists... Done Building dependency tree        Reading state information... Done 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:  build-essential:i386 : Depends: gcc:i386 (>= 4:5.2) but it is not going to be installed                     Depends: g++:i386 (>= 4:5.2) but it is not going to be installed                     Depends: dpkg-dev:i386 (>= 1.17.11) E: Unable to correct problems, you have held broken packages.   Also tried my hand at finding exactly what package it is I actually need (not sure if it's even the correct way):  $ apt-file update $ sudo apt-file -x search '/libz.so.1$' E: The cache is empty. You need to run 'apt-file update' first.   Other ways I should try?

After upgrading from 10.04 to 12.04 I am trying to install different packages.  For instance ia32-libs and skype (4.0).  When trying to install these, I am getting the 'Unable to correct problems, you have held broken packages' error message.   Output of commands:  sudo apt-get install -f Reading package lists... Done Building dependency tree        Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.   After running this:  sudo dpkg --configure -a foo@foo:~$ sudo apt-get install -f Reading package lists... Done Building dependency tree        Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


My question is as stated in the title: What do we lose when we drop the condition that a ring $R$ be an abelian group (i.e. it may be the case that $a+b \neq b+a$ for some $a,b \in R$).  If we allow this condition then we may consider, for example, any group $G$ to be a (noncommutative) ring with multiplication being conjugation in $G$ and addition being multiplication in $G$. In such a "ring" $G$, we always have $0=1$, so I suspect things might get strange.   Has anyone thought at all about such objects? Are they entirely uninteresting?

Ever since I learned the definition of a ring, I've wondered why the additive group is required to be abelian.  What happens if we allow $\langle R, + \rangle$ to be nonabelian as well as $\langle R, \cdot \rangle$?  Is this impossible?  If not, what is the this type of algebraic structure called?  Here is the definition of a ring that I am using:        $\langle R , + \rangle$ is an abelian group with identity $0$.   $\langle R , \cdot \rangle$ is associative.   $a\cdot (b + c) = a\cdot b + a \cdot c$.   $(a + b)\cdot c = a\cdot c + b \cdot c$.


I've been trying to instantiate a XSSFWorkbook using a FileInputStream, based on an existing excel file (xlsx). I should use an Excel template due to some business requirements. XSSFWorkbook templateWorkbook = new XSSFWorkbook(new FileInputStream("myTemplate.xlsx")); I'm using XSSF because I want to improve the performance while creating large Excel files (~50k rows). So I've followed some examples like  that shows how to use SXSSF to increase performance. Then, after get the Excel template into a new XSSFWorkbook I do this: SXSSFWorkbook mySXSSFWorkbookFromTemplate = new SXSSFWorkbook(templateWorkbook, 100); However, I always get either the following exception (while reading the Excel file, I mean I don't even get into the SXSSFWorkbook instantiation):  java.lang.NoClassDefFoundError: org/apache/xmlbeans/impl/store/DomImpl$CdataNode  or this one:  java.lang.NoClassDefFoundError: org/apache/xmlbeans/xml/stream/XMLStreamException  I'm able to solve the last exception while re-running/re-debugging the unit test (which is weird because the code and the POM dependencies remain exactly the same). So now, I'm stuck getting the NoClassDefFoundError DomImpl$CdataNode This is how my POM file looks like.     <dependency>         <groupId>org.apache.poi</groupId>         <artifactId>poi</artifactId>         <version>5.0.0</version>     </dependency>      <dependency>         <groupId>org.apache.poi</groupId>         <artifactId>poi-ooxml</artifactId>         <version>5.0.0</version>     </dependency>      <dependency>         <groupId>javax.xml.stream</groupId>         <artifactId>stax-api</artifactId>         <version>1.0-2</version>     </dependency>      <dependency>         <groupId>org.apache.xmlbeans</groupId>         <artifactId>xmlbeans</artifactId>         <version>4.0.0</version>     </dependency>  UPDATE: I'm able to see the CdataNode.java class withing the xmlbeans jar file.

I am getting a NoClassDefFoundError when I run my Java application.  What is typically the cause of this?


So I have stumbled upon this question recently and though I solved it I'm not sure if it's correct or not.     A fair $6$-sided die is rolled repeatedly until a $6$ is obtained. Find the   expected number of rolls conditioned on the event that none of the   rolls yielded an odd number.   My attempt:   Let $X$ be the random varibale denoting the no of rolls required until a $6$ is obtained. Without any given condition $X \sim Geom(\frac16)$ But $$\mathbb{P}(\text{obtaining a }6 |  \text{roll does not yield an odd number})= \frac13$$ so, $$X | \text{none of the  rolls yielded an odd number} \sim Geom\bigl(\frac13\bigr)$$ and hence $$\mathbb{E}(X | \text{none of the  rolls yielded an odd number})= 3$$  Is this the correct answer? Is there any other approach? Any help would be very much appreciated!

A fair 6-sided die is rolled repeatedly in till a 6 is obtained. Find the expected number of rolls conditioned on the event that none of the rolls yielded an odd number  I had tried to figure out what will be the conditional distribution of $\frac{X}{Y}$ but I can't solved it yet Where $X $ is the face numbered 6 is obtained and $Y$ is the event only even number is occured


was voted to be a possible duplicate of .   Could the resulting notice please be removed? It is irrelevant and prevents people from actually reading the question since it looks like a real dupe.

The new "marked as duplicate" text says:     This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.   In some cases though, users like to re-post their questions rather than fixing their closed originals, so we close them as dupes of that original. In this case, the text simply doesn't apply.  It is also the only special case (not counting meta posts) where closing as duplicate does not require any answers on the original question.  If both duplicate questions have been asked by the same user, the text should be special cased to reflect that:     This question has been asked before by the same user.  Instead of re-posting, the original question should have been edited and clarified.   … which will provide better guidance, and it will only mention existence of any answers when it is relevant and true.


I am deeply under qualified for this stuff, but (Along the lines of getting it right, means .... grabbing a shovel & rolling up your sleeves) I have been looking at all the other schema posts on here and trying to understand the big picture / cloning parts / nudging thing around, but I keep getting an error (Missing '}' or object member name.) after "about" line ? + I have seen (what appears to be) instances of Google green lighting schema, but if it isn't done according to the best practices of accepted standards, somewhere within the magic formula Google seems to ignore / degrade it, so: wandering if packing all of this into one script is the best strategy + How to fix my error. In all humbleness. Thank you for any help / insight.   <script type="application/ld+json"> {    "@context" : "http://schema.org",    "@type":"WebSite",    "name":"Old Bull Lee",    "url":"https:\/\/www.oldbullshorts.com",    "about":"The Finest men's Shorts, Shirts & Board shorts",     }    {     "@context" : "http://schema.org/brand",     "@type":"brand,     "url":"https:\/\/www.oldbullshorts.com",     "name":"Old Bull Lee",     "description":"The Finest Men's Shorts, Shirts & Board shorts. Made In America. Free Shipping.",     "contactPoint": [{     "@type": "ContactPoint",     "telephone": "310-802-0246",     "email":"info@oldbullshorts.com"     "contactType": "customer service"   }]   "sameAs":[       "https://www.facebook.com/OldBullLee",       "https://twitter.com/oldbulllee",       "https://www.instagram.com/oldbullleeofficial",       "https://en.wikipedia.org/wiki/Old_Bull_Lee",       "https://www.wikidata.org/wiki/Q37855311"   ]   "image":"https://www.oldbullshorts.com/pub/media/seller_image/default/Old-Bull-Lee-logo.gif","url":"https://www.oldbullshorts.com" } </script>

I am continuously getting the following error:     Missing '}' or object member name.   Does anyone see what it is referring to? I am not missing the ending }.      {         "@context": "http://schema.org",         "@type": "ProfessionalService",         "additionalType": "http://www.productontology.org/id/Web_design",         "name": "site",         "url": "example.com",         "logo": "example.png",         "description": "Company",         "telephone": "555 555 5555",         "areaServed": ["Canton", "Akron", "Fairlawn", " Medina", "Hudson", "Green", "Cleveland", "Massillon", "Independence", "Stow", "North Canton", "Baberton"],     }


Actually I have studied that the smaller the mass of a particle, the fastest it can travel in space. (But i don't know the mass of a single proton) and my question is: can any particle travel faster than a single photon?

Is there a particle called a "tachyon" that can travel faster than light?  If so, would Einstein's relativity be wrong?  According to Einstein no particle can travel faster than light.


Based on a   Does the automated jerk detector also double as an automated nice-guy detector?  I was under the impression it just blew out serial-downvotes.  What all is caught by the system?

I just noticed that I lost a bunch of points from my reputation score, and I used the "reputation" tab on my user profile page to try and track down the cause.  During my investigation, I noticed there was an unusual event of type "reversal". In the normal place of a question title, it says "voting corrected".     What does this mean, and what caused it?  Did I do something wrong? Why did I lose all of that reputation? Is the system punishing me for leaving too many good answers?  Is there any way to earn it back?


I use a dedicated server with 2gb ram, 6ghz (Dual Xeon) cpu and 500gb Bandwith (actually I need %30 of this bandwith) and 120 gb storage capacity (and I need only 50-60 gb capacity) I have a Java application, my app visited by approximately 2000 users everyday (these user don't upload or download file, only database operations). I want to migrate to aws but I am a little confused. Amazon has many plans and I can't choose which plan is proper for me? I just want to have a stable server solution.

This is a  about  Related:      I have a question regarding capacity planning. Can the Server Fault community please help with the following:   What kind of server do I need to handle some number of users? How many users can a server with some specifications handle? Will some server configuration be fast enough for my use case? I'm building a social networking site: what kind of hardware do I need? How much bandwidth do I need for some project? How much bandwidth will some number of users use in some application?


Ubuntu cannot access the shared resources on the Windows 8.1 machine.  I have gotten the share to work from Ubuntu to win 8.1 but the Ubuntu system does not seem to want to allow me to sign-on to the win 8.1 system. I have enabled networking on the win machine (it is using Home Group as the net/domain name so I tried changing the SAMBA config file to match it is giving/suggesting the user name of tom for me which is my Ubuntu name and Windows provides an arbitrary password, but it won't take...  Ubuntu seems to see the Win 8.1 machine fine (presents it in the network browser,, but I just can't seem to get authorised? I'm using Uid=Tom Domain=HOMEGROUP and the win 8.1 supplied password.. I have set the win 8.1 machine to share all.. pic docs printers etc...  The referenced question in the comment below is pointing out issues sharing from Ubuntu not accessing a Windows share.... or how to find the D*** windows settings that are screwing things up.. So I MAY be a duplicate but not of that one!

I have a wireless Access point which is connected to internet and the same being accessing by 2 system, one on windows XP and the other on Ubuntu.  Please let me know if it is possible to access the c:\ d:\ or any drives on windows xp machine directly from ubuntu system ?  I have tried doing this with 2 windows xp system but not sure how to do this from ubuntu.  Any help regarding the same is highly appreciated. (reason to do so is to access files in windows xp machine)  -Thanks & regards, Manju


How would you define a person without (or with very bad) social skills?  I don't mean a totally anti-social, but one that struggles to behave in a social context, and feels awkward or out-of-place when forced to stay and talk with other people.  Maybe that would be anti-social, but not by choice... Just thinking to be rejected/avoided by others, and that keeps trying to relate to others but fails everytime.  Is there a word that could describe this? Or else, what word would be the closest and more appropriate to help explain this?  Altough some answer overlap my question  differs from mine. This question is not about understanding others and their feelings, but rather at behaving in social context, or being marked as a weird/awkward person that's avoided by others.

A person who has a low emotional IQ and is bad at reading people and decoding their expressions and body language. I don't think I need to give any statement for it.  Edit: They do not have any physical or mental disorders but more like lacking empathy but are not psychopaths. Looking for synonyms of 'socially illiterate'.


I am revising a document based on the referee's comments. They wanted a list of things to add to a paper otherwise full of mathematical and textual material in just 14 pages using the ieeetran class.  Is there any method for making ieeetran produce a more condensed output? Are there any strategies for making a manuscript more condense while preserving the same material?

I am submitting a paper to a conference that has a limit of 10 pages.  I have edited and edited the text, but the paper still fills 11 pages, and I am reluctant to remove anything.  What tricks can I use to make the paper fit in 10 pages?    I know about \vspace{-1mm}, but are other and better tricks?  How can I squeeze a little bit between lines, around the elements produced by \maketitle, around headlines, etc. in a way that is consistent and does not look too ugly?  Is it possible to reduce the font size from 11 points to, say, 10.9?  (This should be community wiki, but I don't have enough rep yet.)


Text on Dispel magic     Choose one creature, object, or magical effect within range. Any spell   of 3rd level or lower on the target ends. For each spell of 4th level   or higher on the target, make an ability check using your spellcasting   ability. The DC equals 10 + the spell’s level. On a successful check,   the spell ends.   Text on Favor of Darkness     Starting at 2nd level, by presenting your holy symbol and spending a   use of Channel Divinity, you can flood a 30-foot radius centered on   you with magical shadows.   I can add more relevant text if needed but I could add some if needed.  I don't see any spell level associated with it but it is definitely a magical effect.  Can this be dispelled?  Why/Why not?  Are there any checks associated with dispelling this?

In D&D 5e, the spell Dispel Magic says     Choose one creature, object, or magical effect within   range.    The rest of the spell description explains that spells "on the target" of a level lower than that at which Dispel Magic was cast automatically end, and those of a higher level require a check.  This makes perfect sense when targeting creatures or objects which may have spells on them. But what does it mean to target a magical effect?  Does it mean that you can choose to target just one specific ongoing spell effect instead of stripping the whole shebang (clearing a negative spell from an ally with positive spells also in place, or a positive spell from an enemy who is under attack from a negative spell)?  Or, is this only for the special case of certain spells (like Imprisonment) which have effects which specifically mention being targeted by Dispel Magic, and since no effect is described otherwise? (This is a literal reading: a spell is a magical effect, but does not have spells on it, so the Dispel Magic effect has nothing to act on.)  Or — and I think this is a stretch — can magical effects which are not spells be dispelled by Dispel Magic? If so, what are the mechanics?


I am using this code to log keys and am trying to get it to run a function whenever 10 keys are pressed.  from pynput.keyboard import Key, Listener import logging import time log_dir = "" amountofkeypressed logging.basicConfig(filename=(log_dir + "key_log.txt"), level=logging.DEBUG, format='%(asctime)s: %(message)s') def everysec():     if amountofkeypressed == 10:         print("HI") def on_press(key):      amountofkeypressed = amountofkeypressed + 1     everysec()     logging.info(str(key))  with Listener(on_press=on_press) as listener:     amountofkeypressed = 0     listener.join()   Any way to fix this?

The following code works as expected in both Python 2.5 and 3.0:  a, b, c = (1, 2, 3)  print(a, b, c)  def test():     print(a)     print(b)     print(c)    # (A)     #c+=1       # (B) test()   However, when I uncomment line (B), I get an UnboundLocalError: 'c' not assigned at line (A). The values of a and b are printed correctly. This has me completely baffled for two reasons:   Why is there a runtime error thrown at line (A) because of a later statement on line (B)? Why are variables a and b printed as expected, while c raises an error?   The only explanation I can come up with is that a local variable c is created by the assignment c+=1, which takes precedent over the "global" variable c even before the local variable is created. Of course, it doesn't make sense for a variable to "steal" scope before it exists.  Could someone please explain this behavior?


How is the amount of flags per day calculated, or why was my amount of flags decreased by 1?  I am flagging quite a lot and I know that I got an additional flag from time to time. Last week I had 51 moderator attention flags per day with about 2350 helpful flags and 15 declined flags.  Then another one was declined and my flags decreased to 50 per day.   There is an "old" question: , but its answer is still "flag weight" based and seems outdated. Or is the flag weight still calculated in the background?  It is not that important, but I love to have the flags increased and it is a bit disappointing when one is removed. So what are the rules regarding the number of flags one can raise?

Looks like flagging has been affected by releases today. Are these intended effects?   Higher daily limits (appear doubled for me, flagging of posts limit also doubled).  Explained by Shog9 below. Soft comment deletion  - e.g. for "accept rate" obsolete comments - it does in fact work, but the immediate feedback is gone.  This is fixed now. Has the throttling rate changed?  Seems possible to repeated flag without waiting 5 seconds.  If it was broken, it isn't anymore. Old soft deletions that were neither categorised as "helpful" or "declined" have all become "helpful".   If limits have been updated, can we get the new formula published? Not changed, as confirmed by Shog9.


I need to show that the following integral:  $$\int_0^\pi\frac{(\sin nx)^2}{(\sin x)^2}dx$$ =  $n\pi$, for all natural numbers $n$. What is the method to evaluate the above?   I initially thought of the Leibniz rule,  but that wouldn't work as the result only holds for positive integers,  meaning the integral would not be a continuous function in $n$. Is there some other way to prove it?


If a user has too many comments deleted through rude/abusive flags, the system raises an auto-flag on one of the posts where this happened.  This helps moderators notice patterns of behavior that we might otherwise miss.  (Sometimes rude comments are deleted by the community without moderator intervention, and sometimes every mod handles one or two and nobody notices the overall pattern otherwise.)  Today I saw a post with such a flag for User A.  Before we handled the flag, the post was deleted by User B (the author).  I expected the flag -- which is, after all, about comments from User A -- to remain.  However, the flag was auto-cleared when the post was deleted by another user.  I'll leave a timeline link in a deleted comment here for moderators.  I think in the past these flags have remained active (and I think they should).

The new  flag is raised whenever a user adds many non-constructive or rude comments.   Yesterday, a user added 4 rude comments, thus raising the flag. 4 minutes later, they deleted the post. Once they deleted the post, the PCA flag was automatically cleared. Hence their act was never made known to the moderators.   Thanks to a custom flag by another good user, we managed to catch the user and sent them a warning. But what if the user was not flagged?   Hence, I request that PCA flags must not be cleared on a post, even after the owner of that question has deleted the post.


I just switched my Ubuntu system language from French to English. I have been asked if I wanted to create new folders (Desktop, Pictures, ...), I said yes. My old files were not moved, but now I have a Bureau (French for Desktop) and a Desktop folder. When I create a folder on my desktop using GUI, the folder is actually created in the old Bureau folder. What should I do to stop having the old French folders getting used (which I guess would also work for other folders)?  EDIT: it is not answered by  because it does not answer to why "When I create a folder on my desktop using GUI, the folder is actually created in the old Bureau folder"  It get fixed, probably when I restarted a second time. So I needed to restart once for getting the new folders, and another time to get the GUI Desktop to work as expected.

Recently, I changed the system language in Ubuntu 16.04. from German to English. I was aksed whether I want to change the standard folder names from German to English (e.g. "Dokumente" to "Documents") which I agreed to. Now my desktop is empty and there are no files on it. If I open a terminal and enter cd Schreibtisch (Schreibtisch is the German name for "Desktop") I can still change to the old path. However, the other German paths, apparently, have been deleted/properly renamend. I have two questions on this matter:  1.) Why did the files not get transfered to "Desktop" from "Schreibtisch"? 2.) Is there a way to move all files at once from ~/Schreibtisch to ~/Desktop?


Suppose $X$ and $Y$ are independent Poisson random variables with parameters $\lambda$ and $\mu$, respectively. Find the conditional probability mass function $P(X=k\mid X+Y=n)$.    Don't know how to approach this. Additionally, the question asks me to find $E[X\mid X+Y=n]$. What is the distinction? Does it have a different distribution?

I'm working on a problem from Casella and Berger's Statistical Inference. X is distributed as Poisson$(\theta)$ and Y is distributed as Poisson$(\lambda)$, with X and Y being independent. We let U = X + Y and V = Y, and the conditional pdf of V|U is:   $\hspace{15mm}\large f(v|u) = \large \frac{f(u,v)}{f(u)} = \huge \frac{\frac{\theta^{u-v}}{(u-v!)}*\frac{\lambda^ve^{-\lambda}}{v!}}{\frac{(\theta+\lambda)^ue^{-(\theta+\lambda)}}{u!}}$  Apparently this simplifies to   $\hspace{15mm}\Large {u \choose v} (\frac{\lambda}{\theta+\lambda})^v(\frac{\theta}{\theta+\lambda})^{u-v}$  I don't see how the $\Large(\frac{\lambda}{\theta+\lambda})^v$ is possible. I keep ending up with $\Large(\frac{\lambda}{\theta})^v$ when I simplify the problem.


My karbonn s2 screen got cracked ,i need to transfer my contacts on pc.i tried using droid at screen (adb).since i can't go to usb debugging option because of damaged screen.While using droid@screen it doesn't read the device.How to solve it ? any help would be appreciated!!

The screen of my phone is physically broken, so it doesn't display anything, but the touch aspect does seem to be working, as I can unlock my phone, and get haptic feedback.  Before I go to get it replaced, I'd like to back up some personal data from the built-in memory to the SD card. I'm fairly certain that if I can get adb to recognize the device, then I can use  to see where I am touching the screen and do what I need to do. Problem is, when I plug it in, it's not recognized, while my emulator is.  I suspect that I might not have USB debugging enabled, which I think is necessary for adb to work. If this is the case, can someone give me screenshots of their Droid X (running 2.3.X) going from the home screen, through all the menus, to activating debug mode? Hopefully I can do it by dead reckoning and adb from there.  Edit: I haven't changed anything about the ROM or launcher; it's all stock.


I'm making a Python program to assign new values to processes and dynamically monitor them:  import os import subprocess #!/usr/bin/env python print "hello world" os.system("ps lx") print "Enter PID" pid = raw_input() print "Entered PID",pid print "Enter new priority" new = raw_input() print "Entered new priority is"new os.system("sudo renice new pid")   I don't know how to call nice and renice with arguments in Python.

How do you call an external command (as if I'd typed it at the Unix shell or Windows command prompt) from within a Python script?


According to the Big Bang theory, the universe cooled down as it expanded. I would like to know why does the temperature decrease? And by "why" I mean how. What causes the temperature to decrease, what's is the physical process?  For simplicity, let's consider the early Universe after protons and neutrons formed but before the molecules appeared, so we have something resembling a monatomic gas. Temperature of such gas is defined in terms of the average kinetic energy $\epsilon_{avg}$ of the particles: $$T = \frac{2}{3}\frac{\epsilon_{avg}}{K_{boltzmann}}$$  If the temperature $T$ decreases, then the $\epsilon_{avg}$ must decrease. By what causes $\epsilon_{avg}$ to decrease? A popular explanation for an ideal gas in a cylinder is that the particles do work on the retracting piston and lose energy. But can we apply this explanation to the expanding Universe? I don't think so.  If the particles lose energy, where does this energy go? The particles do not collide with the edge of the universe (the imaginary "piston"), since there is nothing for them to collide with. There is no edge, since the whole space is expanding.

As we know, if an ideal gas expands in vacuum, as its energy is unchanged, the temperature remains the same. An ideal gas's energy does not depend on volume. In general, the energy is $kT$ times the total degrees of freedom, like in an ideal gas, the total degrees of freedom is $N$ particles plus three dimensions, $3N$.    Then if the total energy of the universe is $kT$ times the total degrees of freedoms of the universe, as the universe expands, its energy and entropy should not change, but if the temperature falls, the number of degrees of freedom should grow. It is quite puzzling to me that the universe is having more and more new degrees of freedom. It seems to be contradictory to the entropy argument.


I know that $\max_{x_1} \min_{x_2} f(x_1, x_2)$ is not equal to $ \min_{x_2} \max_{x_1} f(x_1, x_2)$ in general. I am wondering what happens to $\min_{x_1} \min_{x_2} f(x_1, x_2)$ and $\min_{x_2} \min_{x_1} f(x_1, x_2)$ are they equal to $\min_{x_1, x_2} f(x_1, x_2)$? Proof or Counter Examples are welcome.

For a minimization problem of function $f(x,y)$, does the equation $min_{x,y} f(x,y)=min_{y}min_{x}f(x,y)=min_{x}min_{y}f(x,y)$ always hold?  I saw this equation somewhere. It does the minimization in a sort of iterated way, treating either $x$ or $y$ as a constant first. But what about a saddle point? If I use Hessian matrix to consider the convexity of $f(x,y)$, it will let me know it doesn't work if there's a saddle point, while this iterated method may still give me a value.  I think this kind of problems falls into optimization, and I also wonder if  $min_{y}max_{x}f(x,y)=max_{x}min_{y}f(x,y)$ holds.


If App Store review team rejects your App, can you be sure that the issue they found is the only one? Or they just stop reviewing once they encounter an issue?   I'm asking because I'm not sure whether to double check the whole App or just fix the problem they found and go ahead once again. I'm not really into wasting another 9 days to wake up with another rejection.  So, do they report all the issues they found, or the first one they noticed? Are there anybody out there who got reported more than one bug?   It's worth to add that my rejection happend due to 2.3 paragraph which stands for:     Apps that do not perform as advertised by the developer will be   rejected

Our app was rejected recently with reason Google+ signin, which we understood is not according to Apple policy and need to fix.  While discussing about this issue we came across an interesting question with Apple review process, does Apple review team list all issues (if more than one exists) while rejecting app (or) would they stop reviewing other areas as soon as they found an issue (in our case Google+ signin)?


What would happen, if person A would take person B's hair and drink Polyjuice potion. Wait until transformation is complete and then take a hair from person A (as person B) and make person C drink Polyjuice potion.  Would person C turn into person A or person B and if it would be the first, wouldn't that be a method to determine whether or not someone has taken Polyjuice potion?

If you were to take Polyjuice, then clip hair from yourself (so it would essentially be the hair of the person you transformed into), could you create more Polyjuice to transform into that person using that hair?


I am using revtex4-1 and section headings are aligned in the center. How do I modify this?

I am using REVTex 4-1, for my own personal use, not a paper submission.  I like using REVTex and  I have gotten somewhat used to it, but for my current purposes I need left aligned subsections headings. In REVTex only rmp documentclass option gives that, but it also changes other aspects(I prefer prb).  I tried using command \titleformat from the titlesec package, but i can't figure out how to change only one option without changing other settings set by the REVTex (and prb)  \titleformat{\subsection}{\raggedright}{}{}{}  \titleformat*{\subsection}{\raggedright}   Is there a way to only set left alignment, without changing other settings?


I tried following their guide for installing  for Ubuntu 18 but ran into a few issues. After entering the first command: apt update && apt -y install ca-certificates wget net-tools  I'm hit with the following errors. Reading package lists... Done E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (13: Permission denied) W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (13: Permission denied)  I then tried adding "sudo" in front of the original command it seems to have fixed one of the problems but still receive errors at the end. Hit:1 http://ca.archive.ubuntu.com/ubuntu bionic InRelease Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB] Get:3 http://ca.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]    Get:4 http://ca.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]  Get:5 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [586 kB] Get:6 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [740 kB] Get:7 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1,007 kB] Get:8 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [980 kB] Fetched 3,564 kB in 6s (601 kB/s)  Reading package lists... Done Building dependency tree        Reading state information... Done 24 packages can be upgraded. Run 'apt list --upgradable' to see them. E: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?  I'm not sure what to do from here. Any advice?

I'm trying to run this command in the terminal:  sudo apt install software-properties-common   This is the error message I get:  E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)   E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend),     is another process using it?


I have been using Ubuntu Desktop for a while now, but today for some reason I am not able to start it. Here is what I see.     I have tried rebooting and starting it in recovery mode. but seems to be of no help. I am downloading fresh copy of Ubuntu so that I can play around with steps mentioned here -      Here is what I have tried.      I booted Ubuntu from USB      Saw 4 options :    1. Try Ubuntu without installing    2. Install Ubuntu    3. OEM Install    4. Check disc for defects      I went to first option. Opened terminal --> sudo fdisk -l      This gave me my actual device name --> /dev/sda1      Then I executed --> sudo fsck /dev/sda1      Rebooted again from Hard disk. Same issue persist. Anything I am   missing?   Will keep this thread updated. Meanwhile, suggestions are welcome.

I installed 10.10 a few days ago. The only changes to the default install are the addition of Chrome and Pinta.  It was fine for a few days, then today login etc seemed slow. Likewise it couldn't even render the restart/shutdown menus.  Hoping it was some botched update, I ran the update manager; it tried to install but failed (the UI didn't make it obvious what had failed).  Fine, ok. Shut it down (press enter on the blank shut-down dialog).  Fire it up hoping... And... #fail.  Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg.   Is it now a brick?     More details:  GRUB 1.98+20100804-5ubuntu3   With  Ubuntu, with Linux 2.6.35-22-generic   Causes  udevadm trigger is not permitted while udev is unxonfigured Giving up waiting for root device.   Or  Ubuntu, with Linux 2.6.35-23-generic   Causes  mount: mounting /dev on /root/dev failed: No such file or directory   Then the same for /sys and /process


I have a very simple animation. I move the default cube from one location to another along the x axis. This gives me six keyframe points, the start and and stop locations of the x, y and z axes.  Using the following code I can return what type of transform it is (location, rotation, scale, etc.), the frame number and the value of the change. for action in bpy.data.actions:      for fcurve in action.fcurves:         print(fcurve.data_path)         for point in fcurve.keyframe_points:             print(point.co)  Here is a printout of the return. The first group is for the x axis, then y then z. location <Vector (10.0000, 0.0000)> <Vector (20.0000, 3.4726)> location <Vector (10.0000, 0.0000)> <Vector (20.0000, 0.0000)> location <Vector (10.0000, 0.0000)> <Vector (20.0000, 0.0000)>  My question is, is there a way to return what axis the change is occurring on? I have not been able to find a command to return the axis the "Vector" is associated with. In this simple example it easy to just figure it out but when the scene becomes complicated with lots of moving parts it can be very difficult to know which keyframe point is associated with which axis. Thank you for any help you can give me!

We are doing research on monitor human activities to avoid adverse events. In part of it, we did an experiment in our MoCap lap to detect the human motion to monitor his activities. We have f-curves from that motion. But we need all the xyz coordinates values for that motion for that given time (just say about 2-3 minutes) to do a scientific analysis of the data.  Do anyone have an idea how to get xyz values from f-curves?


Let $G$ be the group of $2X2$ real matrices:$$\left (\begin {matrix}  a & b \\ 0 & d\\ \end {matrix}\right )$$ where $ad\neq 0$ with respect to the regular matrix product. Let $N$ be the cyclic Group generated by:$$\left (\begin {matrix} 1& b\\ 0&1\\ \end {matrix}\right )$$ Prove that the quotient Group $G/N$ is abelian. It is easy to show that $N$ is normal subgroup of $G$. Therefore for each $g\in G$ $Ng=gN$ where where $Ng$ and $gN$ are the right and left coset of $G$. I've tried to come up with a few numerical examples however I was not able to find a couple of matrices $a$ and $b$ such that $abN=baN$

Let $G$ be the group  of all $2 \times 2$ matrices of the form $\begin{pmatrix} a & b \\ 0 & d\end{pmatrix}$ where $ad \neq 0$ under matrix multiplication. Let  $N=\left\{A \in G \; \colon \; A = \begin{pmatrix}1 & b \\ 0 & 1\end{pmatrix} \right\}$ be  a subset  of the group $G$. Prove that  $N$ is  a normal subgroup of $G$ and prove that  $G/N$ is abelian group.   Here is my attempt!  To prove $N$ is normal I consider  the group homomorphism $f \colon G \to \mathbb R^*$ given by $f(B) = \det(B)$ for all $B$ in $G$. And I see that $f(N)$ is all the singleton $\{1\}$ since $\{1\}$ as a subgroup of $\mathbb R^*$  is normal, it follows that $N$ is also normal. Is this proof helpful  here? Then how to prove that $G/N$ is Abelian? I know $G/N$ is a collection of left cosets.   Thank you.


As I' m currently dealing with artinian and noetherian modules, I' m asking myself whether there is an artinian module which is not noetherian.   I think so, but even after I thought a lot about this, I didn't find an example. Does anybody find one?

I've just learned the definitions of Artinian and Noetherian module and I'm now trying to think of examples. Can you tell me if the following example is correct:  An example of a $\mathbb Z$-module $M$ that is not Noetherian: Let $G_{1/2}$ be the additive subgroup of $\mathbb Q$ generated by $\frac12$. Then $G_{1/2} \subset G_{1/4} \subset G_{1/8} \subset \dotsb$ is a chain with no upper bound  hence $M = G_{1/2}$ as a $\mathbb Z$-module is not Noetherian.  But $M$ is Artinian: $G_{1/2^n}$ are the only subgroups of $G_{1/2}$. So every decreasing chain of submodules $G_i$ is bounded from below by  $G_{1/2^{\min i}}$.  Edit In Atiyah-MacDonald they give the following example:     Let $G$ be the subgroups of $\mathbb{Q}/\mathbb{Z}$ consisting of all elements whose order is a power of $p$, where $p$ is a fixed prime.   Then $G$ has exactly one subgroup $G_n$ of order $p^n$ for each $n \geq 0$, and $G_0 \subset G_1 \subset \dotsb \subset G_n \subset \dotsb$ (strict inclusions) so that $G$ does not satisfy the a.c.c.   On the other hand the only proper subgroups of $G$ are the $G_n$, so that $G$ does satisfy d.c.c.      (Original images  and .)   Does one have to take the quotient $\mathbb{Q}/\mathbb{Z}$?


So I consistently experience this problem where faces have weird shading on the surface. I just want the surfaces to be uniform in texture (like a default plane). I have attached screenshots below. The first one has this weird shading error where there's that shadow on the uipper right corner. The second one has these striations that show the edges on the face. How do I get rid of these?

I frequently come to the problem of having a mesh with parts I would like to render smooth and "hard" edges connecting them.   How can I set the mesh to show the sharp edges but render everything else smooth?  In the example I would like the sides of the individual cylinders render smooth but the intersection between bottom and top to be sharp/flat


Surprisingly, I can't find a discussion on calculating confidence intervals for the mean $EY=e^{\mu+\sigma^2/2}$ of the lognormal distribution. My question goes beyond what is covered in the link below, and is specific to the package EnvStats.    Say I have some lognormal data:  mydat <- data.frame(value = rlnorm(1000, meanlog = 6, sdlog = .5))   That looks like:   I use EnvStats::elnormAlt to estimate parameters for the lognormal distribution mydat.   elnormAlt(mydat$value, method = "mvue", ci = FALSE, ci.type = "two-sided",    ci.method = "land", conf.level = 0.95)   And obtain:  Results of Distribution Parameter Estimation --------------------------------------------  Assumed Distribution:            Lognormal  Estimated Parameter(s):          mean = 454.7097844                                  cv   =   0.5359667  Estimation Method:               mvue  Data:                            mydat$value  Sample Size:                     1000   When I change the argument ci = TRUE, I get the error:  Error in integrate(density.fcn.qlands.t, -pi/2, theta, nu = nu, zeta = zeta) :    non-finite function value   My questions are twofold:    Can someone succinctly explain the mathematical meaning of cv? What is the meaning of the error message I'm getting, and how can I calculate confidence intervals using the Land (Cox) method?

I've heard/seen in several places that you can transform the data set into something that is normal-distributed by taking the logarithm of each sample, calculate the confidence interval for the transformed data, and transform the confidence interval back using the inverse operation (e.g. raise 10 to the power of the lower and upper bounds, respectively, for $\log_{10}$).  However, I'm a bit suspicious of this method, simply because it doesn't work for the mean itself: $10^{\operatorname{mean}(\log_{10}(X))} \ne \operatorname{mean}(X)$  What is the correct way to do this? If it doesn't work for the mean itself, how can it possibly work for the confidence interval for the mean?


I will be visiting Japan for two weeks as a tourist. I would like to have Internet access on my phone at all times, and found that there are some mobile data options for tourists. How do they actually work? Especifically:  Can I bring my european phone, put the sim card in and it works or will I need to rent/buy a japanese terminal? How is the signal through Japan? Will it work only in big cities, on most populated areas or all through Japan? Where can I buy them?  What is the cost and the data cap like? What is the process of geting one? Will I need to sign a contract, show them my ID and all that or can i just pay and get the card inmediatly?  This is all both to be able to make a decision beforehand if it is indeed worthwile and to make sure I dont get scammed once I get there.

I have an unlocked North American (Canada) iPhone 5s, where can I buy a data only SIM card in Japan ? I'm not interested in renting nor in a voice plan, I'll be staying for 4 weeks.  I'll be landing in Tokyo, so preferably around there. Can I get them from the airport somewhere ? I'm assuming I won't have problems with the network/frequencies, am I correct ?


I tried looking for similar questions to this one but was unable to find any.  I'm wondering if theres someone that knows how to make real money in Skyrim.  I don't have dawnguard or hearthfire.  My blacksmithing is around 80, maybe 82ish, and ive tried mining kolskeggr mine and selling the gold ore to pavo but that seems really slow due to the respawn rate of the mine.  Any suggestions would be greatly appreciated.  Thanks.

In Oblivion, I had two favorite money-makers:   Dump all my stuff except some basic armor and potions, and raid an oblivion tower. The armor and weapons was worth lots, and selling it in Anvil made a lot of cash fast. Harvest an entire farm's worth of crops, create 'restore fatigue' potions and sell them.   Skyrim seems to spoil this:   Merchants have a max-amount per day/QOD/... instead of per item You can't carry as much (or maybe I have yet to discover the strength/feather spells) Alchemy is a lot harder (most common items go into food recipes now, which don't sell for those prices) On top of that, once a dungeon is cleared, it doesn't respawn - so no 'farming' familiar dungeons?   What are some easy/repeatable money making methods in Skyrim? Which are most efficient effortwise/real-life-time wise?


I have to merge the querysets below in a single list:      result_list_1 = Col.objects.defer("tags").filter(producer__username__icontains=crit)  result_list_2 = Col.objects.defer("tags").filter(name__icontains=crit) result_list_3 = Col.objects.defer("tags").filter(description__icontains=crit) result_list_4 = Col.objects.filter(tags__name__icontains=crit) ...   Each result_list contains items, which have a unique numeric id I can use to make sure there are no dups.  I can't use | while querying the DB or Q objects.   How do I merge the resulsets in one single list?

I am trying to build the search for a Django site I am building, and in that search, I am searching in three different models. And to get pagination on the search result list, I would like to use a generic object_list view to display the results. But to do that, I have to merge three querysets into one. How can I do that? I've tried this: result_list = [] page_list = Page.objects.filter(     Q(title__icontains=cleaned_search_term) |     Q(body__icontains=cleaned_search_term)) article_list = Article.objects.filter(     Q(title__icontains=cleaned_search_term) |     Q(body__icontains=cleaned_search_term) |     Q(tags__icontains=cleaned_search_term)) post_list = Post.objects.filter(     Q(title__icontains=cleaned_search_term) |     Q(body__icontains=cleaned_search_term) |     Q(tags__icontains=cleaned_search_term))  for x in page_list:     result_list.append(x) for x in article_list:     result_list.append(x) for x in post_list:     result_list.append(x)  return object_list(     request,     queryset=result_list,     template_object_name='result',     paginate_by=10,     extra_context={         'search_term': search_term},     template_name="search/result_list.html")  But this doesn't work. I get an error when I try to use that list in the generic view. The list is missing the clone attribute. How can I merge the three lists, page_list, article_list and post_list?


I have a laptop with windows 10 and I want to install both Ubuntu 18.04 and 20.04 alonside with windows. How do I do that? Does the installing order of 18.04 and 20.04 matters?

I'm absolutely new to Linux. I would like to know how to install Ubuntu alongside the pre-installed Windows 8+ OS.  Should I do it with Wubi, or through the Live USB/DVD?  What steps do I need to take to correctly install Ubuntu?


Is it just the regular give and take knowledge site or is there much more to it? I have personally started liking this site a little too much!..I mean I downloaded the app to stay updated(never really did this before). What is that ultimate point which makes this site so special? Isn't it too social,friendly and yet we find competition all around?? What is it that drives people so close to this site? And what do I as a person gain?Is it just materialistic or is there something deep within?

Alternatively, are there good ways to get more satisfaction out of my job, possibly by leveraging my participation in SO?


I would like to create my own server so that my brother and I can play together. I have tried writing in seeds and it won't work for me. How can I create my own server?

I just got Minecraft Pocket Edition on my iPhone, but I'm having trouble figuring out how to start multiplayer. When I go to menu, there is only one button that says Play. How do I join or create servers?


I am not sure how to solve the following inequality from a BMO Round 2 paper. This is question 4 and it reads: If $x,y,z$ are positive real numbers, prove that $$4(x+y+z)^3>27(x^2y+y^2z+z^2x)$$

Prove that, for all positive real numbers $x$, $y$ and $z$, $$4(x + y + z)^3 > 27(x^2y + y^2z + z^2x)$$  I've tried expressing it as a sum of squares, but haven't got anywhere.   Hints are also welcome.


Is the statement below grammatically correct?     "There are a cupboard, a tea table, and a carpet."

There are so many questions on this website. There is so many questions on this website.  The former "sounds right," but the contracted form of the latter does as well:  There's so many questions on this website.  Which is correct?


Is there a way that I could obtain a list or maybe iterate through a list of each member variable of a class -regardless of it's type.   My intention is to add them all to a template std::map.  class Person {     int Age;     char *Name;     template<typename Container> std::map<char *, Container> List;     void MakeList()     {        for(auto i : Person.memberVariables)        {            List.emplace(i);        }     } };   Could I do something like the above to add each variable of my class to the list, regardless of how incorrect the other code is. The adding to the list is what I'm interested in.   Thanks in advance.

I'd like to be able to introspect a C++ class for its name, contents (i.e. members and their types) etc. I'm talking native C++ here, not managed C++, which has reflection. I realise C++ supplies some limited information using RTTI. Which additional libraries (or other techniques) could supply this information?


Is there a known proof without differentiating that proves that all irreducible polynomials over $\mathbb{Q}$ are separable? (Or even better, for all fields of characteristic $0$.)  EDIT: As people seem to question this thread; I do know a proof with derivatives - my motivation for one without is simply curiosity. Multiple approaches are always nice.

I am reading separable extension. I don't quite understand why $\text{char} 0$ fields must be perfect. If $F$ is a $\text{char} 0$ field, $f(x)$ is an irreducible polynomial in $F[x]$. Then why $f$ must be separable? Assume $f$ has multiple roots, say $r$ is a multiple root of $f(x)$. Then $r$ is also a root of $f'(x)$. $r$ is in the splitting field of $f(x)$ over $F$, denote it as $E$. Then why $f$ must divide $f'$? I know $f$ is irreducible but I don't know how the argument goes on. Thanks for any help!


I just made a Mojang account and it is not letting me sign into Minecraft.net with it. I used my E-mail for my username and everything.  I can sign into Mojang.com no problem what so ever but Minecraft.net says Unknown username or password.  I am completely lost and have no clue what to do.

My Minecraft password will not work. I've reset it about 5 times and no matter what I choose as my password, it will not take it. I just made my Minecraft account today   I am entering my username correctly, and I am typing everything in the correct boxes, but it always says "Unknown username or password...". I know I am putting my username in correctly because if I try to re-register, it will not let me use my email because it's currently in use.  Could somebody explain to my why no matter what my Minecraft password is, it won't work?


If to commute to school by bike, how is the school rucksack usually transported? I can see the following options:   Keep it on the back. It is quite heavy, gravity center will be high and in case of falling over head it may add to the injury. Put into basket above the rear wheel. The form of the usual rucksack does not fit well to secure it from falling. Use specialized bicycle container for luggage. But the models I have used so far are time consuming to remove and not adapted at all to carry on hand when full.   Are there special equipment for that? Which approaches are usually taken?

Right now I use a backpack to hold all of my supplies including spare tubes, pump, patch kits, tools, my change of clothes for work, etc.  This is the backpack I use:    It's about as comfortable as a backpack can get without getting into the hiking backpacks with frames. Altogether I would say it weighs no more than 10 lbs max. The muscles in my back get slightly irritated during my commute.  Would it be more comfortable to use a rear cargo rack on my bike instead? Will adding more weight to the bike change how the bike rides and feels?  EDIT: After doing some research I came across  that explains the different methods of carrying your gear on commutes and how it affects your body. It's worth a look.  EDIT #2: Having tried both for a couple of weeks now, I can say that (for me personally) the backpack is the better way to go given the relatively light weight I have to carry.  If you do use a backpack, make sure that the straps are tightened enough so that it's positioned higher up on your back and to the point to where there is little to no movement on your back. This makes a world of difference when it comes to comfort.


I don't understand why one should take transpose of $\operatorname{tr}(AB^T)$ and why we use the fact that $\operatorname{tr}(M)=\operatorname{tr}(M^T)$ for any $M$ that is a square matrix to solve the problem.

Consider the vectorspace of all real $m \times n$ vectors and define an    inner product $\langle A,B\rangle = \operatorname{tr}(B^T   A)$.    "tr" stands for "trace"        which is the sum of the diagonal entries of a matrix.   How do you prove that $\operatorname{tr}(B^T   A)$ is indeed a inner product?  Kind regards


In the Ultimate Edition of Batman V Superman Dawn of Justice, there's this scene (image below) where Lex Luthor is talking to a hologram of a large figure before being arrested in the Genesis Chamber:    Can someone give details who is this? And those three cubes in front of him. Thank you.

After Doomsday was defeated, a spec-ops team sent to the Kryptionian ship in Metropolis found Luthor submerged in water, in front of a... thing, which "held" three metal cubes. The thing looked up, roars, and dissipates into thin air.    What the hell was that all about? I am really confused. What was that creature and what was Luthor doing with it?


Why does deviation become minimum at minimum deviation position? What is its importance in practical applications?

why do we have minimum deviation angle in a prism? I mean why does the angle of emergence first decreases, attains a minimum value and then increases.why?


Has anybody tried this circuit? this circuit supposedly takes radio waves and turns them into a voltage. My questions are what are the peak voltages? and what current could i possibly hope to get if i run a 5v circuit with say a voltage regulator or a buck-boost converter

Why can energy invested in RF radiation not be harvested fully? What are the main factors that affect this? Is there any significant research nowadays that fully describes this process? I stand on the conclusion: "Energy moves from one form to another.", but in this case why can it not be harvested in that quantity to use it for powering low-power devices or store it in significant quantities in some batteries for later use? Why is it not profitable nowadays and why is it not used today like energy from water, wind and other energy sources?