Question:- Consider the following statements  i. an incident may be closed without being fixed ii. incidents may not be raised against documentation iii. the final stage of incident tracking is fixing iv. the incident record does not include information on test environments v. incidents should be raised when someone other than the author of the software performs the test   a) ii and v are true, i, iii and iv are false b) i and v are true, ii, iii and iv are false c) i, iv and v are true, ii and iii are false d) i and ii are true, iii, iv and v are false e) i is true, ii, iii, iv and v are false  The given answer is 'b'. 'i' is true, that is fine, but how is it that 'v' is also true? I need an explanation for that, Please some one help me on this.


Is there a reason to use arithmetic expression n*(1/k) over n/k?

Sometimes I encounter in arithmetic operations expression like this: n*(1/k).  Such expression can be presented in simpler manner: n/k.  I could imagine that in certain situations the former could be more descriptive if (1/k) represents well known ingredient but it is not always the case. What about performance gains/losses? What about precision?  Is there any hidden reason that some developers use n*(1/k) form?


In my thesis, I need to have the webpage reference in the bibliography to look like this:     [#]    Author (year). Title. Available:      I need the title to be italics and the "Available to say "Tilgjengelig"(norwegian) Now it says "side" which means page. When I use @online, the reference is how I want it, exept the title is not italics, and it says "side"(page) instead of tilgjengelig(available) I do not know how to upload files. I paste everything here:  \documentclass[12pt]{report}  \usepackage[a4paper,width=150mm,top=25mm,bottom=25mm]{geometry}  \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage[norsk]{babel} \usepackage[     backend=biber,     style=ieee,     sorting=none ]{biblatex} \addbibresource{referanser.bib}  \begin{document} \chapter{Test} Blablabla \nocite{*}  \renewcommand{\bibname}{Litteraturliste} \printbibliography   \end{document}   This is my references: My references:  @book{barbero2013, address = {Boca raton, Florida}, author = {Barbero, Ever J}, booktitle = {Composite materials: Analysis and design}, keywords = {elementmetoden,komposittmaterialer,matematiske,modeller}, publisher = {CRC Press}, title = {{Finite element analysis of composite materials using Abaqus}}, year = {2013} } @book{bunsell2005, address = {Bristol}, author = {Bunsell, A R and Renard, J}, keywords = {Fiberforsterkede komposittmaterialer,fiber,forsterkninger,kompositter,komposittmaterialer,materialer}, publisher = {Institute of Physics Publishing}, title = {{Fundamentals of fibre reinforced composite materials}}, year = {2005} } @misc{hovland2011, author = {Hovland, G}, title = {{Mekatronikk Labfasiliteter}}, url = {http://old.uia.no/no/portaler/om\_universitetet/teknologi\_og\_realfag/-\_ingenioervitenskap/-\_-\_mekatronikk/lab}, year = {2011} } @online{byg402, author = {{Universitetet i Agder}}, title = {{BYG402-G Elementmetoden i konstruksjoner}}, url = {http://old.uia.no/portaler/student/studierelatert/studiehaandbok/14-15/emner/byg402}, year = {2014} } @book{zenkert1996, address = {Stockholm}, author = {Zenkert, D and Battley, M}, publisher = {Kungliga Tekniska h\"{o}gskolan}, title = {{Foundations of fibre composites}}, year = {1996} } @misc{iso3451, title = {Plastics : Determination of ash. Part 1: General methods}, howpublished = {ISO3451-1}, year = {2008} } @misc{iso527, title = {{Plastics - Determination of tensile properties - Part 5: Test conditions for unidirectional fibrereinforced plastic composites}}, howpublished = {ISO-527}, year = {2009} }


How can I change all the white pixel into transparent using photoshop?

.I want to change all the white pixels into transparent so that I can choose the background of my choice.   I may decide to use a black background, so multiply doesn't work.


What is the difference between a deep copy and a shallow copy?


Finding distribution of $\frac{X_1+X_2 X_3}{\sqrt{1+X_3^2}}$

I am trying to find distribution of random variable:  $$\frac{X_1+X_2 X_3}{\sqrt{1+X_3^2}}$$  where $X_i \sim \mathcal{N}(0,1)$ and independent.  My thinking so far is to use random variable algebra and to find distributions step by step. However, I don't know what to do with the variable: $\sqrt{1+X_3^2}$ (it seems like some variant of $\chi$-distribution).   Moreover, I'm worried that my thinking is to complicated and that the solution should be more elegant.


Gmail and hotmail are tagging my mails as spam?

We have two domains .local and .com. Sending connector uses .com fqdn while receiving connector uses .local fdn. I got an error "no reverse dns set". So i called my isp and get it done. After doing it.Gmail and hotmail started tagging my mails as spam. While testing on mxtools i got smtp mismatch error.   I have One send connector Two receive connector- default and client. Not able to change fqdn on default. Server authentication is not letting me do so. We have Microsoft front page security for exchange. We are using firewall in which exchange ip is mapped to public ip.(nat).


Does an object rotate around its COM when no torque is given?  For example if I were to throw a baseball bat in the air(I will hold it by the end of its shaft while I am throwing it and swing it upwards in order to give it angular momentum, and after I release it, the only force that acts on the bat is gravity),  Would it immediately start to rotate around its COM the moment I release it?


Do papers ever get published posthumously?

What is the longest discrepancy between death and publication?


Find two rational numbers $\frac ab$ satisfying $\mid \pi - \frac ab\mid < \frac{1}{\sqrt 5 b^2}.$

Find two rational numbers $\frac ab$ satisfying $$\mid \pi - \frac ab\mid < \frac{1}{\sqrt 5 b^2}.$$  I dont know how to find such rationals. IS there a method? or trial?


What are the boundaries between draft, manuscript, preprint, paper, and article?

In the terminology for a peer-reviewed publication to be submitted to a reputable scientific journal, what are the differences and characteristic properties of the following?   draft manuscript preprint paper article   My own take on it would be that my text is a draft until I submit it to a journal, at which point it becomes a manuscript.  When the manuscript is accepted it becomes a preprint, and when it gets published it becomes a paper, which is synonymous to article.  Would that be an accurate summary?  Would anyone have corrections or additions?


C/C++ linker CALL16 reloc at xxxxx not against global symbol

I'm getting these errors while linking, both messages have to do with the same object file.  CALL16 reloc at 0x5f8 not against global symbol   and  could not read symbols: Bad value   The 2nd message seems to be the reason I'm getting the CALL16 error, but the file compiles just fine.  Any tips on fixing this?  FYI, I'm cross compiling for a MIPS target and using gcc 4.1.2  EDIT: No luck so far:  Here are my flags used: -fPIC,-Wl,-rpath,-Wl,-O1  I've also tried the following without success: -mno-explicit-relocs  -mexplicit-relocs  -mlong-calls  -mno-long-calls  -mxgot  -mno-xgot    Meanwhile, I'll go back to the source at this point and investigate more.


What does it mean ** in Django update query?

Currently I am working on old project developed in python 2.7 & django 1.9.13 & during development I have found below kind of code.  from django.contrib.contenttypes.models import ContentType model_type = ContentType.objects.get(app_label=app_name, model=model_name) model_type.model_class().objects.filter(id=10).update(**{'emp_comment': 'hello'})   I have read about ContentType & know how it works but still not have much clear ideas but what I am not able to figure out is **{'emp_comment': 'hello'}.  I have search online for such kind of syntax but not able to find so anyone have idea how above code works ?


Integration of $\sin(2x)$ via two different methods

When I integrate $\sin(2x)$ first using the trig substitution of $\sin(2x) = 2 \sin x\cos x$ and then using u-substitution I get $\sin^2(x) +C$. Integrating the same expression using u-substitution directly, I get $-\cos(2x)/2+C$. These answers do not seem to be equivilent.  When I let $x=0$ in the first example's answer I get $=0$ but when I let $x=0$ in the seccond answer I get $-1/2$. Clearly I must be doing something wrong.  If I had made these integrations definite integrals over $0$  to $\pi/2$ seems like I would have gotten different answsers. Can you assist?


How do I format my USB flash to FAT 16 on windows?

This question has been asked before. I think it deserves a simpler, more direct answer.   Edit: - Please post answers specific to Windows platform. No one wants to install Ubuntu just to format a flash drive.


$G$ a group and $H, K\mathrel{\unlhd}G$. Assuming that $H \cap K = \{1_G\}$ and $G = \langle H, K \rangle$, prove that $G \cong H \times K$

I am trying to prove the following statement:     Let $G$ be a group and $H, K\mathrel{\unlhd}G$. Assuming that $H \cap K =  \{1_G\}$ and $G = \langle H, K \rangle$, prove that $G \cong H \times K$.   From this, we get that $HK \cong H \times K$. Naturally, it would be ideal if I could prove that $HK \cong G$. One issue that I am facing here is the meaning of $G = \langle H, K \rangle$. How is this defined (I mean, more explicitly)? Is my strategy correct or


import java.util.Scanner;  public class Michal {     public static void main(String[] args) {         reply();      }     public static void reply() {         Scanner input=new Scanner(System.in);         String name=input.nextLine();           if(name=="john"){               System.out.println("bear!");         }else if(name=="mary")         {              System.out.println("lovely lady!");         }else{             System.out.println("I don't know that person.");         }         System.out.println(name);         input.close();     }  }   I consider myself still a beginner to Java ,so please don't be harsh in your answers. I was trying to create a program that returns an answer every time it gets a certain input , however it seems to return "I don't know that person" all the time.


This is a program that runs a Conways Game of Life simulation. The main method is here:  public static void main(String Args[]) {     int x = 0;     int y = 0;     boolean cellState[][] = new boolean[][]{};     boolean newCellState[][] = new boolean[][]{};     String answer;     Scanner input = new Scanner(System.in);      while (true) {         System.out.print("\n Type anything for next generation, 'new' for new grid, or 'stop' to end>> ");         answer = input.nextLine();         if (answer == "new") {             cellState = newCells(cellState);         } else if (answer == "stop") {             break;         } else {             System.out.println("Not an option yet");         }     } }   No matter what answer is entered it will skip past the if statements and return to the beginning of the loop.   It has nothing to do with the actual contents of the statements as far as I can tell, but its might have to do with the boolean expressions.


I can use compgen -a to list all the aliases:  $ compgen -a egrep fgrep grep l la ll ls   l, la and ll are defined in my ~/.bashrc:  # some more ls aliases alias ll='ls -alF' alias la='ls -A' alias l='ls -CF'   What command can I run to see what an alias expands to? I have found the whatis, whereis and which, but they don't do what I want.


I'd like to know how to create a table of contents in LaTeX. For example, if I were to write a book, I would want something like this  Contents      Chapter 1       1.1 Real Analysis .............. 1       1.2 Role of LUB Axiom........... 3   How do I create this? I'd like to know.


Footer doesn't fully go down to the bottom with flex layout

I was trying to make sticky footer for my website, i have used javascript to create element in this case for specific reason, i created <footer> element and tried to get it fully at bottom at every resolution of width.  I want to append footer at body only, so this is my javascript:  $(function () {     $('.products').each(function(i, obj) {         if (i > 0) {            obj.id = "p" + i            var pl = document.createElement("footer");            var t = document.createTextNode(i);            pl.className = "pageblock"            pl.appendChild(t);            document.body.appendChild(pl);         }     }); });   This creates footer, in this case single footer only, and editing style of .pageblock class works.  To bring footer fully down, i have tried this:  .pageblock {     clear: both;     position: relative;     text-align: center;     bottom: 0;     z-index: 10;     font-family: 'Lato';     font-size: 3em;     color: white;     font-weight: bold; }   but for some reason, it still wouldn't work, it would be stuck in somewhere nearby vertical center.   I have flex layout on website, so elements horizontally scale with browsers with and increase vertical size.    Is there any way i can fully move element to the bottom so it's always there, even when vertical size get's bigger or smaller? Is there any way i can do this without wrapping everything up in single div which may damage the code itself?  Thanks!


Vue/JS: why does editor throw error if constant defined within if/else and returned outside?

I have a computed function but the return is coming back as an error when I have the constants declared within the if/else   showMsg() {     if (something) {        const foo = "hello"     } else {        const foo = "bye"     }     return foo; // my editor highlights this "foo" as an error   }  the return foo is highlighted and my editor says cannot find name foo. When I change it to this, the errors clear, but I was hoping to not use let and not declare it outside the if/else:  showMsg() {     let foo;     if (something) {        foo = "hello"     } else {        foo = "bye"     }     return foo; // my editor highlights this "foo" as an error   }


What happens if I keep both Windows and Ubuntu operating system?

I'm now trying Ubuntu live from a flash drive. I kind of like it, but at the same time I paid a lot for my Windows 7.  Can someone explain me what will cause/happen if I keep both of them? I heard something about the disk split (partitioning) or something. All I want to know is what happens with my 1TB hard drive. Will my documents still be there?


Note: The following definitions from my book, Discrete Mathematics and Its Applications [7th ed, 598].  This is my book's definition for a reflexive relation   This is my book's definition for a anti symmetric relation   Is a reflexive relation just the same as a anti symmetric relation?  From what I've, the only way to meet that antisymmetric requirement is to have the same ordered pair, say an element a from Set A, (a,a). If you have anything other than the same ordered pair, (1,2) and (2,1), it will not meet the antisymmetric requirement. But the overall definition of reflexive relation is that it's the same ordered pair. Are they just two ways of saying the same thing? Is it possible to have one and not the other?


How do I interpret the 'correlations of fixed effects' in my glmer output?

I have the following output:   Generalized linear mixed model fit by the Laplace approximation  Formula: aph.remain ~ sMFS2 +sAG2 +sSHDI2 +sbare +season +crop +(1|landscape)    AIC   BIC    logLik deviance  4062  4093  -2022   4044  Random effects: Groups    Name        Variance Std.Dev. landscape (Intercept) 0.82453  0.90804  Number of obs: 239, groups: landscape, 45  Fixed effects:             Estimate Std. Error z value Pr(>|z|)     (Intercept)  2.65120    0.14051  18.868   <2e-16      sMFS2        0.26922    0.17594   1.530   0.1260     sAG2         0.09268    0.14529   0.638   0.5235     sSHDI2       0.28345    0.17177   1.650   0.0989   sbare        0.41388    0.02976  13.907   <2e-16  seasonlate  -0.50165    0.02729 -18.384   <2e-16  cropforage   0.79000    0.06724  11.748   <2e-16  cropsoy      0.76507    0.04920  15.551   <2e-16   Correlation of Fixed Effects:            (Intr) sMFS2  sAG2   sSHDI2 sbare  sesnlt crpfrg sMFS2      -0.016                                           sAG2        0.006 -0.342                                    sSHDI2     -0.025  0.588 -0.169                             sbare      -0.113 -0.002  0.010  0.004                      seasonlate -0.034  0.005 -0.004  0.001 -0.283               cropforage -0.161 -0.005  0.012 -0.004  0.791 -0.231        cropsoy    -0.175 -0.022  0.013  0.013  0.404 -0.164  0.557   All of my continuous variables (denoted by a small s before the variable name) are standardized (z-scores). season is a categorical variable with 2 levels (early and late), and crop is a categorical variable with 3 levels (corn, forage, and soy).  This correlation of fixed effects matrix is really confusing me, because all of the correlations have the opposite sign that they do when I look at the simple regressions of pairs of variables. i.e., the correlation of fixed effects matrix suggests a strong positive correlation between cropforage and sbare, when in fact there is a very strong NEGATIVE correlation between these variables - forage crops tended to have much less bare ground compared to corn and soy crops. Pairs of continuous variables have the same issue, the correlation of fixed effects matrix says everything is the opposite of what it should be ... Could this just be due to the complexity of the model (not being a simple regression)? Could it have something to do with the fact that the variables are standardized?   Thanks.


Currently, what are the best structured courses available online on quantum computing?

As we make inroads into Machine Learning, there seem to be plenty of respectable courses available online via Coursera, edX, etc. on the topic. As quantum computing is still in its infancy, not to mention, incredibly daunting, it is vital that easy to understand, introductory courses are made available.  I was able to find these courses:      However, I am not certain how relevant the second course might be.  Obviously, this question may benefit from receiving answers in the near future as the topic steadily becomes mainstream.


A continuous function taking natural numbers is constant

Let f:[0,1 ] to N  be a continuous function .Show that f is constant    We know that a continuous function on the given interval has Ivp then how to proceed? Please help


Is it correct to say: These are not homework?

A teacher sent home a list of assignments with a cover letter explaining, "These are not homework."  "This is not homework," or "These pages are not homework," sound equally normal to me, but "These are not homework," just sounds weird.  Is it correct grammar?  ...  I don't agree that the question: 'Agreement in “[Singular Noun] Is/Are [Plural Noun]”?' describes this specific usage.  In "These are not homework," the word "These" is not a singular noun.  It's a plural pronoun.  I suspect that some of the problem is that the missing noun is implied to the reader only by the physical presence of other documents, and not contextually from the surrounding content of the cover letter itself.


How to prevent spammers sending bogus@mydomain emails out of my name

Lately I receive a lot of Delivery Status Notification (Failure) e-mails.  Bogus spam email is sent from blablaxx@mydomain to other emailadresses, and bounce back to my catch-all info@mydomain with above error-message.  Off course the blablaxx@mydomain email-addresses are non-existing and AFAICS the emails are sent from different foreign ip-addresses.  I've setup a DNS txt SPF record, but that doesn't seem to help much.  What can I do more?


Total Score of TopTags in AndroidApp does not match

I have noticed that the score of Top Tags in the Android App does not match the score on my profile.  As an example does my Profile say that I have a score of 806 in the , while the Android App displays a score of 881. The score of all Top Tags do not match.


So I came across  about a new  to render to SVG. That sounds great and all but how can it actually be done? Which buttons give me an SVG file at the end and where are they?  It seems pretty common for many blender/gimp plugins to simply not say how to use them. Even if the installation goes fine, there's no mechanism to find out what new buttons or menus exist.  Similar questions:


Difference between International edition of a book and a non international one

Most of the textbooks  I used during my undergraduate studies (outside north America) are International editions, so what is the difference between a national and an international edition of a book?  For example, I have a book that says     XYZ published this special edition for the benefit of students outside the United States and Canada.   and they don't mention why this international edition is special or what is the benefit!


jQuery doesn't affect parts of page added through extension script

My extension modifies page's code: $.get(chrome.runtime.getURL('/html/new-search.html'), function(data) {         $('.site-header__item--search').html(data);     });  Then I'm adding event listener to previously attached elements: $('.new-search').on({         focus: function (){             alert('wow');         }     });  It doesn't work. In spite of this, such code is being successfully executed on parts of document, which weren't affected by script. What can be the fix?


I bought a new ps4 controller and I’m trying to sync and use it wirelessly to my PS4 ,but everytime I do the LED lights wouldn’t come on without the USB. I’ve done all the resets and turn my PS4 on and off and even gotten a new USB cord and I’m still having this problem


Operation Table for Field $F=\{0,1,a,b\}$

I'm taking a mathematics course in my university that relies on past knowledge of an older course I've taken. It's been a long time, and I don't remember much from the other course.   One thing I'm struggling on is coming up with the operation tables for the elements in a field. I know they have something to do with modular arithmetic, but I'm also new to that. Anyway here's what my professor came up with for the addition table:     \begin{array}{|c|c|c|c|} \hline +& 0 & 1 & a & b \\ \hline  0 & 0 & 1 & a & b\\ \hline  1& 1 & 0 & b & a\\ \hline  a& a & b & 0 & 1\\ \hline  b& b & a & 1 & 0 \\ \hline \end{array}   And this for the multiplication table:     \begin{array}{|c|c|c|c|} \hline  * & 0 & 1 & a & b \\ \hline  0 & 0 & 0 & 0 & 0 \\ \hline  1 & 0 & 1 & a & b \\ \hline  a & 0 & a & b & 1 \\ \hline  b & 0 & b & 1 & a \\ \hline \end{array}   I get that adding anything to zero is that element, and multiplying by one is also that element, and multiplying by 0 is zero. What I don't get is how to get the other answers. I'm a bit stuck and any help in the right direction would be greatly appreciated.


I would like to use the <kbd> tag in a comment to refer to a keyboard shortcut. Is there a reason why this doesn't seem to be possible? I've tried it at the webapps stackexchange.


How do I stop the program once I have reached a certain line?

I'm trying to create a game in python, a game of multiple choice called "Who wants to be a millionaire?" and the problem is I want the program to stop executing the second question once the user failed to answer the first one. print("What is the tallest being in existence?")  input(("If you want to see the choices just press enter. " + name))  print("Is it A, Dinosaur?") print("B, The one and only, Giraffe") print("C,The soul of the ocean Whale") print("or D, None")  print("So what do you believe is the answer ? " + name + " ")  answer_1 = input()  if answer_1 == Q1_answer:     print("Correct! You Have Earned 100,000$ ")     score = +100000 if answer_1 != Q1_answer:     print("Im sorry, You have lost the game.")  print("Which famous inventor was born in 1856?")  print("A Einstein") print("B, Tesla") print("C, Napoleon") print("D, Newton")  answer_2 = input()  if answer_2 == Q2_answer.lower():      print("Correct! It is Tesla Indeed, Your reached  200,000$ ")     score = +100000 else:     print("Sorry, wrong answer. You have lost and earned 0$. ")


I'm having trouble thinking of a good example of this (I have a good example, but it doesn't make sense without context.)   Take this silly premise for the sake of explaining what I'm talking about: Imagine for a moment that whenever someone talks about a shape, the shape that ALWAYS springs to mind is square. Squares represent almost all shapes in people's minds, so when you talk about a shape, you might as well be talking about a square. In this situation, a square is the _ example of a shape. Archetypal?   (I'd also be interested if anyone else has good examples -- that's better left for a comment)


How to inspect systemd journal files directly?

I have arch linux failing on a device. The device doesn't have any screen, it doesn't respond to network. So I take its SD card, insert it in ubuntu desktop, see a fresh system.journal there and... How to see what is inside?  From the Arch Linux documentation I know that I can do:    strings /mnt/arch/var/log/journal/.../system.journal | grep -i message   But it is really basic. The question is:  Is there more convenient way to inspect system.journal from another system, than using strings? Can I for example specify the file to read for journalctl?


Post apocalypse movie from the 70s or 80s with a truck in it

For years I have been trying to track down a film that I saw a clip of on an old BBC show called Screen Test.  They introduced the film as "having used the most scrap from scrap yards than any other film."  It was either an Australian or a New Zealand film. Post apocalyptic like Mad Max. In-fact for years I thought Mad Max would be the film, but it wasn't.  They showed one scene from the film which the contestants answered questions on.     A six wheel truck drives up to the camera. It looks like a Mad Max truck. There are at least two people in the truck, a man sits close to us with a woman next to him. He looks through binoculars (sci-fi bins). He sees a long trailer thing on rails and it has sails. Then this land ship is attacked by bandits on motorbikes or something. The sails fall and people run about panicking. Then we cut back to the truck and it drives away.   The film is not Battletruck or Damnation Alley. The truck I think had six wheels, but I could be wrong. Not evenly spaced wheels, with the second wheels set back. A gun slung at the back, like a chain gun. It was futuristic like and pointy like a Lambo, not a square truck. In black or dark grey.  Like this but with another set of wheels at the back and painted dark:    It probably wasn't a very good film and has dropped below the radar of obscurity. Anyone who could help ID this film for me would be greatly appreciated.  You can see how obsessed I am as still making models of it in Lego:    Here is a bad drawing of what I remember:


1 = -1 Clearest way to explain why this proof is wrong.

Say you are a high school student or a young undergrad. You are being taught about complex numbers and you are told that $i = \sqrt{-1}$.  You go home and you write this: \begin{equation} \begin{aligned} 1 & = 1 \\ 1 & = \sqrt{1} \\ 1 & = \sqrt{(-1)(-1)} \\ 1 & = \sqrt{-1}\sqrt{-1} \\ 1 & = i \times i \\ 1 & = i^2 \\ 1 & = -1 \end{aligned} \end{equation}  You are dismayed. The infamous imaginary numbers are inconsistent after all!    The best answer would be the clearest explanation of why the "proof" is faulty, keeping in mind the level of the student. An explanation is extra clear if t presents insights to the student, as well as being correct and concise.


I am trying to train a LSTM model. Is this model suffering from overfitting?   Here is train and validation loss graph:


What are the implications of the Fabricate spell on the environment?

No, I'm not talking about magical pollution.  Specifically, I mean how with  you      Choose raw materials that you can see within range. (120 ft)   Nothing about needing materials to occupy the same spot as the finished product.  This strongly implies that you are moving actual materials in the world to form a 10-foot cube at a location you desire. Could you use this to move a rock out of the way? To dig a hole? Clear a forest?  The amusing implications are whether you could form a (small 5-ft cube) cave in a rock wall while making a nice statue made of the rock, or a really lazy wizard clearing all trees in the nearby area to make a giant pile of firewood.


Local artinian ring and module with finite projective dimension

$R=k[x]/(x^n)$, $n>1$. Suppose $\operatorname{pd}_RM<\infty$, $M$ might not be finitely generated and $M$ might be uncountably generated. I want to show $M$ is free irregardless of non-finitely generated (i.e., either countably or uncountably generated).    I am aware that the previous post indicates a solution for finitely ranked free modules in the free resolution as . However in Eisenbud, there is no such guarantee.   I have two ideas on this.    I was referring to Eisenbud Commutative Algebra Exercise 4.11b to solve the problem for finitely generated case. However, there is no reason to assume $F_i$'s have finite rank. So this clearly does not work. See answers below Mariano Suárez-Álvarez's comments. The other way is to see $M$ as a limit of finitely generated modules $N_i$. I hope the free resolution is finite and finite rank for sure as it is artinian ring. However, it might not be guaranteed that $N_i$ being free where Mariano Suárez-Álvarez commented on this as well.


How to delete all files that are returned by locate

At the moment his is what I do:  Step 1:  locate fooBar /home/abc/fooBar /home/abc/Music/fooBar   Step 2:  Manually perform a removal, by copy-pasting each line.  rm /home/abc/fooBar rm /home/abc/Music/fooBar  How do I do this in one step? Something like  locate fooBar > rm  Thanks.


As we know, "" led the clones to try to kill all the Jedi.  But what was the wording of the order itself?  Was it simply "kill all Jedi", or was it more complicated?


Why does wine leave so much leftover data?

When I apt-get install wine it was like a few hundred megabyte download, but when I purge it it was 21kb...  Then I deleted the .wine folder thinking it was the cause.   I ran apt-get install wine again and it was 21kb download...


Currently I have a task to validate set of reports which is developed by using the logianalysis tool.  Can anyone let me the idea to validate the reports through an interface level as well as data level.  Is there is any automation tool is available in the market to make this task easier.


I just downloaded Linux type WPS Office from WPS Community. After I downloaded it, I opened it using the software center, then I clicked the install button but nothing works. This problem also happens in some cases (updating Firefox)


How do I run a Virtual Box Virtual Machine as a service in Windows 7 without any other software?

I am trying to run a virtual machine in virtual box as a service, meaning virtual box has to start and load the virtual machine immediately after windows 7 (host operating system) loads.  The problem is that most solutions I am seeing require extra software to be downloaded.  Also there are multiple users on the host machine and I want the same virtual machine running at all times regardless of login.  So, without downloading extra software, how can this be done?  I'm thinking vmbox headless, but I'm not sure about this and I am also uncertain how to set it up.  Note:  This needs to be done without downloading extra software.  I already have the virtual machine working with a normal start of the Virtual Box, but I need to be able to have it running for different users of the same host machine.  Update:  I realize now that the problem itself is actually multiple problems that having a virtual machine run as a service would solve (simplest solution if feasible).  In light of that, let me break down the problem into its parts: For each user, despite virtual box being installed for everyone, the virtual machines themselves are loaded from private user folders.  I tried to change this by changing the settings on Virtual box, but it would need to be changed for every user it appears based on results.  Since we have a lot of users and are constantly adding and removing them (and I don't have access to most of the accounts anyway), this isn't a good solution. Copying the virtual machine file into the different user accounts is not viable as it eats up storage resources. At one point, I suggested making a publicly available Virtual Machine user account that everyone could log into for the sole purpose of turning on the virtual machine if it wasn't already on and then switching to their user account after it was on, skipping this process and simply logging into their own account if it is already on.  However, this is undesirable due to the "any user can access this account" nature.  Is there a way to perhaps automate a login at boot but automatically switch user once logged in?    I guess I started with "running as a service" because that seemed the simplest, but if there is another solution, I will welcome it.  I still think that


git -- narrowing the history down to one subdirectory

I understand this is an unorthodox requirement and the background is too complicated to explain.   I have a big directory BIG_DIR that's being tracked by git. I have a SUB_DIR underneath the BIG_DIR, which is tracked as a part of the BIG_DIR.   Now I only want to keep the git tracking history related to SUB_DIR. I dont want to track BIG_DIR anymore, but I want to keep SUB_DIR as an independent repository, while keeping its history.   The whole BIG_DIR has no remote repo. It's all local. if that makes it easier.


Removed python from my install, how do I get it back?

I just typed   sudo apt-get remove python2.6   I didn't realized that this command will uninstall the whole packages from my computer. Is it possible to uninstall the ubuntu without CD. Or how can I fix this big mistake?


Solution of $\int_0^{\infty} \frac{\arctan(x)-\arctan(2x)}x\mathrm dx$ : Why Wolfram Alpha shows a different answer than mine?

For, $\int_0^{\infty} \frac{\arctan(x)-\arctan(2x)}x \mathrm dx$  Let, $I_1=\int_0^{\infty} \frac{arctan(x)}x\mathrm dx$ and $I_2=\int_0^{\infty} \frac{\arctan(2x)}x\mathrm dx$  For, $I_1$ let $x=\frac 1u $ so $I_1=\int_{\infty}^{0} \frac{\arctan(\frac1u)}{\frac1u}\left(-\frac1{u^2}\right)\mathrm du$ $=\int_0^{\infty} \frac{arccot(u)}{u}du$  From which it follows, $I_1=\int_0^{\infty} \frac{\frac\pi2-\arctan(x)}x\mathrm dx$ So, $2I_1=\int_0^{\infty} \frac{\frac \pi2}x\mathrm dx$  In the same way it can be shown that, $2I_2=\int_0^{\infty} \frac{\frac\pi2}x\mathrm dx$  So, $2I=2I_1-2I_2=0$  But, Wolfram Alpha says,   So, where is my error?


Issue using Lightning Component on a Customer Community Visualforce Page

I recieve the below error when I am trying to call a Custom Lightning Component in a Visualforce page that is used in Communities.    Unrecognized Content-Security-Policy directive 'reflected-xss'.   logo180.png Failed to load resource: the server responded with a status of 404 (Not Found)   CommunityHomePage:1 Uncaught SyntaxError: Unexpected token w in JSON at position 0     at JSON.parse ()     at XMLHttpRequest.xhr.onreadystatechange (lightning/lightning.out.delegate.js?v=ZCuyRUYzK_kAf4cKCIeS2A:143)   My Component  <aura:component controller="LeadController" implements="forceCommunity:availableForAllPageTypes">     <aura:attribute name="theLead"          type="Lead"          default="{ 'sobjectType': 'Lead',                    'Rating__c': 2,                    'Company': '',                    'FirstName': '',                    'LastName': '',                    'Email': '' }"/>     <form>          <ui:inputText value="{!v.theLead.Company}" label="Company" class="input"/>         <ui:inputText value="{!v.theLead.FirstName}" label="First" class="input"/>         <ui:inputText value="{!v.theLead.LastName}" label="Last" class="input" />         <ui:inputEmail value="{!v.theLead.Email}" label="Email" class="input" />         <ui:button label="Save" press="{!c.save}"/>     </form> </aura:component>   My Lightning App is   <aura:application access="GLOBAL" extends="ltng:outApp" implements="forceCommunity:availableForAllPageTypes">     <aura:dependency resource="c:CommunityChatter"/> </aura:application>   My VF Page is  <apex:page standardController="Lead">     <apex:includeScript value="{!$Site.BaseUrl}/lightning/lightning.out.js"/>

 </apex:page>


What are the benefits of upgrading crew in FTL?

There's a little skill meter next to every skill for each crew member.    They naturally increase in the skills they use. But what are the benefits of increased skill levels?  I'm looking for hard numbers, eg. If I have a pilot with 50% piloting experience, how does that affect my dodge?


I have a mounted a partial disk on my Ubuntu VPS.  After a reboot the disk will be unmounted.  I can remount it manually but it keeps unmounting after rebooting the VPS and this stops the cron jobs I use for making backups.  In /etc/fstab I added the line:   https://[mylink].stackstorage.com/remote.php/webdav/ /var/stack davfs user,rw,noauto 0 0   [mylink] = my own stack storage name.  The url is correct. If I open it then it asks for my credentials and gives back an "Ok" status.  I don't use users on my VPS; I do everything as root (not sure if this could be the issue).  I have followed  to set up my partial disk (sorry it's in Dutch).


Can I continue a sentence after "respectively"?

Is it okay and in common usage to continue a sentence after using the word “respectively”?  Consider this example:     Denoting the object’s mass and acceleration by m and a, respectively, Newton’s second law can be written as F=ma.


In path integrals, why is phase defined the way it is?

In reading from the book, there's a peculiar definition of the phase, stating:  \begin{align}   K[a,b] &= \sum_{\text{All paths from $a$ to $b$}} \phi [x(t)]\\   \phi [x(t)] &= \text{const} \cdot e ^{\frac{i}{\hbar}S[a,b]}    \end{align}  Why is the phase defined this way? There is no reasoning in the book apart from the fact that this phase must be proportional to the action of the system for the said path. Can someone provide a more comprehensive reason than stated in the book?


Why doesn't a backward wave exist? (Huygens principle)

Since every point on a wavefront act as a source of secondary wave (wavelets) then why do we get only forward wavefront not backward. Huygens principal says that amplitude of the backward wave is zero, but why and how it happens?


I have an equation in my application that works this way: user enter a number X (double) to use it in this equation:  double m = X * 0.015; double resultIWant = X - m;   Note that if m has more than 3 digits after comma I take exactly 3 digits without rounding by using this function:  public static double threeDigitsAfterCommaWithoutRounding(double retenue) {     return Math.floor(retenue * 1000) / 1000; }   but I'm getting wrong calculation result : Example: if X = 1359.532 this is what I get in console:  1359.532 * 0.015 = 20.392979999999998 m = 20.392 (After using the function above) 1359.532 - 20.392 = 1339.1399999999999 !!!!   So the result should be 1339.14 and not 1339.1399999999999 What am I missing ?


Consider the following simple integral. \begin{align*} \int\dfrac{1}{2x}\,dx. \end{align*} Now, I would usually work as follows: \begin{align*} \int\dfrac{1}{2x}\,dx=\dfrac{1}{2}\int\dfrac{1}{x}\,dx=\dfrac{1}{2}\ln x+C. \end{align*} However, I thought I would try: \begin{align*} \int\dfrac{1}{2x}\,dx=\dfrac{1}{2}\int\dfrac{2}{2x}\,dx=\dfrac{1}{2}\ln 2x+C. \end{align*} I suppose this is incorrect. Why? Perhaps I should not use the same letter $C$ for both cases?


An interview problem is like the following:     Given a coin you don’t know it’s fair or unfair. Throw it 6 times and    get 1 tail and 5 head. Determine whether it’s fair or not. What’s your   confidence value?   I came out the following solution:     $H_0:$ the coin is fair   $H_a:$ the coin is unfair      $X$: is the number of heads      Rejection region: $|X - 3| > 2$, i.e., $X = 0,1,5,6$      Significance level alpha:      $\alpha = P(\text{reject }H_0 \mid H_0 \text{ is true})$   $=P(X=0,1,5,6 \mid H_0 \text{ is true})$   $= (\binom{6}{0}+\binom{6}{1}+\binom{6}{5}+\binom{6}{6})*(1/2)^6$    $= (1+6+6+1)*(0.5^6) = 0.21875$      because $\alpha > 0.05$, we do not have enough evidence to reject $H_0$, and   we  accept $H_0$, so the coin is fair   Is the above test a good one? And I did not know how to calculate the confidence value?


Lets say I know population std. deviation $\sigma=5$ and sample size $n=60$. Now lets say my sample mean is $\overline{X}=98$. I already know from central limit theorem that 95% of the time the sample mean will lie in the range of 1.96 std. dev. from population mean $\mu$. With this I can estimate the range of population mean. Now lets say my sample is extremely bad by chance(note my sample size isnt that big) i.e. all are outliers to the right or all to the left (such that its outside 95%). Now my sample mean is way off the population mean. Using this if I now estimate the population mean the range wont obviously have the population mean but I will say that it contains the population mean with 95% confidence but thats not the case. Am I missing something??


How can I exclude a web site from StackExchange feed?

I saw that question on my StackExchange "hot questions" feed yesterday:    I share it here as is since the community explained that it was not a spoiler because the book was published too long ago and Internet is the place where we should expect to see such spoilers anywhere. They could be right about how old that was but still what if a question "not that old to me" comes into the feed?  That made me uncomfortable. I don't want to leave my exposure to spoilers to someone else's discretion and I think the best option is to opt-out from receiving hot questions on SciFi.StackExchange. How can I do that? Would it work if I delete my account on SciFi?


My question is a little silly I know, but I'm curious to know if a particle of light can be theoretically trapped between two reflective screens.   For example once the particle of light has left it's source, and is reflected against a mirror (assuming there is no loss of energy) and you immediately replace the source of light with another mirror. Would the light beam bounce in between the sheets endlessly?


I've got java.lang.ArrayIndexOutOfBoundsException: null exception in my application two times,  both of them happened at list.get() method, the JDK source like this     `private E get(Object[] paramArrayOfObject, int paramInt)   {     return paramArrayOfObject[paramInt];   }   `   What's the problem?   please give some simple example which throws  java.lang.ArrayIndexOutOfBoundsException null.   Thanks!


Proving that for every integer n that is not a multiple of 2 or 5 there is another integer that is made up of 1s that can be divided by n

Prove that for every integer $n$, divisible by neither $2$ nor $5$, there exists an integer $m$, whose decimal representation consists only of $1$s, which is divisible by $n$ (e.g. for $n=13$, we have $m=111111$ divisible by $13$).   Sorry if the format is not up to standard.


SO basically I am learning number theory chapter in the Discrete Maths. Now I really don't understand a proof here.  SO basically it is a corollary which says Let m be a positive integer and let a and b be integers. Then (a + b) mod m = ((a mod m) + (b mod m)) mod m and ab mod m = ((a mod m)(b mod m)) mod m.  Now the proof goes something like this. Proof: By the definitions of mod m and of congruence modulo m, we know that a ≡ (a mod m) (mod m) and b ≡ (b mod m) (mod m). Hence, Theorem 5 tells us that a + b ≡ (a mod m) + (b mod m) (mod m) and ab ≡ (a mod m)(b mod m) (mod m).  What i really can't get here is how is the a ≡ (a mod m) (mod m) and b ≡ (b mod m) (mod m)  I know about the reflexive property about mod but how come this two mod. what i know is a ≡ (a mod m) but how they are saying a ≡ (a mod m) (mod m)


Why there isn't any integer solutions in non-zero integers for $z^3 = 3(x^3 +y^3+2xyz)$?

Consider the following Diophantine equation  $$z^3 = 3(x^3 +y^3+2xyz)$$  Is there any elementary proof for the non-solubility in non-zero integers for this  Diophantine equation, where the absolute value of $x, y$ and $z$ are pairwise coprime integers?  I have proved the impossibility of solution of this Diophantine equation in non-zero integers, but that took quite a few pages and I consider this too long. I hope for a much more elementary and shorter proof for this puzzle.  Hint: It should be noted that is also true for the non-availability of the similar form (replacing coefficient 3 by 1) as the following:   $$z^3=x^3+y^3+2xyz,$$ but this case is very simple to prove, where $x, y\;\&\; z$ are nonzero integers.


Show that if $z_n \to z$ then $\exists M \in R $ such that $|z_n|\leq M\; \forall n \in N$  Let $z_n = x_n + \iota y_n$ and $z=x+\iota  y$  $z_n \to z$  $\rightarrow x_n \to x      $       and $y_n \to y$  because $\langle x_n \rangle$ and $\langle y_n \rangle$ are sequences of real numbers, $\exists M_1$ and $M_2$  such that $|x_n|\leq M_1$ and $|y_n|\leq M_2 \; \; \forall n \in N$   $|z_n|= |x_n + \iota y_n| \leq |x_n| + |y_n| \leq M_1 + M_2 = M \; \; forall n$  Is this proof correct?  My question is different, the sequence is in complex numbers and I have used the result directly quoted in the link


Question involving 4 equations in 4 variables

Let $a$ , $b$ , $c$ and $d$ satisfy the following equations  $a+7b+3c+5d=0$  $8a+4b+6c+2d=-16$  $2a+6b+4c+8d=16$  $5a+3b+7c+d=-16$  Then $(a+d)(b+c)$ equals?  Options: $16$ , $-16$ , $0$ or none of these  I know it can be solved by adjusting the equations through elimination or substitution to find the four variables. But I was wondering if there is a less tedious method?


Is it possible to rename a Unix user account?

I installed Ubuntu on a computer that is now used by somebody else. I renamed the account with her name, but it only changes the fullname, not the user name, which is still displayed in the top right (in the fast-user-switch-applet). Is there a command to rename an Unix user account?  I've thought of creating a new user account with the new name, and then copying everything in the "old" home to the home of the new account. Would it be enough? But then I think the files would have the old account's permissions' owner? So should I do chown -R newuser ~?  Is there a simpler/recommended way to do this?


What does the phrase "Underfull \hbox (badness 10000) in paragraph" actually mean?


How do I reset the Windows XP Administrator password?

I have forgotten the Administrator password of my Windows XP installation and locked out. Is there a way to reset it? I do have physical access to the PC.


Is it possible to paint only inside a stroke on illustrator? what i actually want to do is paint the same stroke with different colors in diferent segments of it but i can't do it...   Also... I've seen some tutorials that include editing a gradient but that would be very complicated and so would be to make a new stroke over this one, I just hope theres an easyer way XD  Edit per comment:  thats cool but not really what im looking for, what i want is lets say my stroke has the shape of a burger i want part of i to be bread color and part of it to be meat color... not one stroke over the other... i want something like this, imagine the jelly worm is my stroke:


Trade Off / compromise to zoom lenses with longer focal ranges

I'm new here- looking for a community of folks to learn from. My love for photography was sparked on my honeymoon in Iceland last year. Now I can't get enough. My question to you is- what's the trade off for zoom lenses with longer focal ranges?   For instance, why not just go but a lens that zooms from 18-300? There must be a trade off / compromise?  Ty! Kat.flanagan


finding coefficient of power basis function

I have for example the coordinate of 3 points and I want to fit a 2 degree polynomial on it. how can I find the coefficients of the polynomial?? it is noted that the function is parametric and is expressed as in which 0


How to show that, for any given left tail probability, the corresponding quantile of standardized t distribution is increasing in degree of freedom for left tail probability less than 0.5? This is obvious when we check statistical tables. But how can we show it analytically?  Can anyone share any thoughts?


I had Ubuntu (150 gb) and zorin os (150 gb). In a hard drive of 320 gb, then using the Disks utilty of Zorin OS 9 which I'm running, tried to delete the Ubuntu one, because I will stay only with Zorin.  Then I noticed that is not so simple. And now that "free space 152 gb" shows as unallocated. My attempts for doing something about that from Zorin failed, I guess because can't do much with the HDD as I'm using an OS running on it right? So even gparted couldn't help.  How do I make a gparted USB bootable? Is that the way to go to boot and resize partition to use that unallocated space?  Can someone point me in the right direction, in a step by step guide?   I'm 100% stuck. Made the USB bootable with unetbootin, downloaded the gparted iso, but when I reboot and enter the BIOS, when pick the usb I get "The system found unauthorized changes on firmware, operating system or uefi drivers", and that's all, no joy,  no gparted resizing my partions or merging the unallocated space...  Tried booting with linux mint from bootable usb, and running gparted, but in that case I can't to anything with unallocated space either. I can only resize    The dev/sda1 can be shrinked only... I'd like to have a 294 gb hd instead... the unallocated simply doesn't show any options or commands (all grayed out)  If I enter any number on dev/sda1 in "free space preceding" (or following), that is substracted from "new size"....  After doing a `mount´ in terminal I see this:  /dev/sda1 on / type ext4 (rw,errors=remount-ro) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/cgroup type tmpfs (rw) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) udev on /dev type devtmpfs (rw,mode=0755) devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755) none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880) none on /run/shm type tmpfs (rw,nosuid,nodev) none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755) none on /sys/fs/pstore type pstore (rw) binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev) systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=fernando) /dev/sdb1 on /media/fernando/MULTIBOOT type vfat (rw,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2)   I guess what I need is to delete the sda2 partition, how do I do that?


Is it possible to install Viber VoIP client on Ubuntu? So that I can call people through Viber from my PC.


Let $X$ be a linear space, $p, q$ sublinear functionals on $X$, and $L$ a linear functional on $X$ such that $|L(x)| ≤ p(x) + q(x),$ for all $x ∈ X$. Prove that there exist linear functionals $L_1, L_2$ on $X$ such that $L(x) = L_1(x) + L_2(x),$ and $|L_1(x)| ≤ p(x), |L_2(x)| ≤ q(x),$ for all $x ∈ X.$   My Work:  First I thought to use Hahn Banach Theorem. But since there is no known subspace it was useless. Then I tried to make $L(x)$ as $L(x)=\frac{L(x+\lambda)+L(x-\lambda)}{2}$ for some scalar $\lambda$ but failed to find suitable $L_1$ and $L_2$. I think this problem is little bit tricky. I want to try it myself and I only need a hint to start. Can somebody please give me a hint?


I need to classify tree heights in a DSM of a slope-y terrain. It´s not a forest but several individual / detached trees. In a plane terrain it won´t be an issue but in that uneven terrain I need somehow to extract the height of the single trees as related to the surrounding ground.   Is there any way to do so using QGIS?   The DSM file is a Tiff, but I can also get it as a point model if this helps.


How to receive more answers to my already posted issue?

I have asked a question at an improper hour and maybe there weren't too many users online, or for any other reasons, it hasn't been viewed by too many people, and I didn't receive a proper answer to it.  I think it would be uncool to post the question again, and I don't want to do this, but how can I invite more users to read my question and share their opinion?  The link to the question is:


Would this character still have to be loyal to the Night's Watch?

Beware this post contains spoilers!     At the end of Season 6 Episode 2, Jon Snow awakes from the dead and the episode ends.   Now, the Night's Watch holds you loyal & responsible for your entire life.  If you desert, you are killed for disobeying your oath to protect the realm with the Night's Watch.       But in this very rare case, Jon Snow technically already gave his life (1st life) to the Night's Watch, and now he is on his second life (again, technically)  Is there something written in some very old book stating you will give your entire life, before and after death, to the Night's Watch?  Or will this incident still be considered his first life?  Or can he just abandon (abandon might be a poor word, maybe a better choice of words would be 'make his own choices') the Night's Watch without any circumstance?   Hopefully, this season gets even crazier!


Could we make the amount of close reasons not a fixed quantity for the SE sites?

I noticed there are many sites where I saw a question being closed by Off Topic instead of, say, Unclear what you are asking. Others which would benefited from This question was closed due to a typographical error were closed by Questions seeking for debugging help ....  I'm not discussing whether those questions should be closed, because they were rightly closed but when I asked about the reasons, I was told that it was due to the limited amount of close options (edit: wait, i'm not talking about the close options inside of Off-Topic reason, but aout the limited number of 1st-level close options) Stack Exchange provided for the sites. But for many questions I read, the close reason was not quite understandable wrt the actual close reason (which I had to ask in the corresponding meta about).  Is there a way to make those close slots variable? Ultimately, only moderators would have access to them as they have today (Edit: or could they ask the staff for more 1st-level close options).  My reason: Closing should be useful for the users at first glance of why. Specially if the user is not well used to the site politics and is a slow-learner about how the site works.  I understand there is the subtext for reasons as off-topic, but this is about communication: it is not about how do you think you send it, but how does the user (in this case the OP and in second place interested users) perceives it.  Edit E.g.: If the user read Closed as Off-Topic at first glance in big bold letters when asking about an on-topic question (but somehow unfitting in other ways), or another main closure title which he perceives inappropriate wrt the involved question (even after shallowly reading the rules) they will feel at first glance the site owners or community does not understand their own rules (which is not the case; instead just a poor way of communicating).  Disclaimer: No. I always understood why MY questions were closed. In this case, I am the... second place interested user, trying to understand how a specific site worked, and what and how was a question permitted in such site.


I am studying for the CAP physics contest and came across this question:     "You are holding a bottle of pop in your hands on a bus. The bubbles in the pop are going straight up. Suddenly, the bus brakes hard to avoid a road hazard. How is the motion of the bubbles in the pop affected?"   I believed that since the bubbles are moving forward in their intertidal frame of reference, that they would move backwards in the drink. However, the answer is they would move towards the front of the bus. I was hoping someone would be able to help me understand why?


Grouping Selecting unique values in a single column


Why do stocks tend to trade at high volumes at the end of (or start) the trading day?

Not related to  question, I am asking why stocks seem to be traded at very high volumes right at the start and end of the trading day. Is this because these graphs factor in all of the premarket and postmarket trades?


Is it possible in circuit design to split like say a temperature sensor line reading into 2 wires, and read by 2 different system/circuitry? My motive is to tap the signal line in a safe way without affecting or disrupting the other system functioning.


Individually wrapped frozen steaks have thawed over 18 hours - are they safe?

I bought individually wrapped steaks from Walmart, and I accidentally left them out of the freezer for about 18 hours. I don't know if they had completely thawed or not. I didn't  open the box to look.      I didn't have time to cook them, so I put them into the freezer.   They are frozen now... but are they safe to eat?    EDIT:  I recieved a response from Black River themselves asking the same question. Their official response was:     Thank you for your email I received regarding a recent purchase you   made. I have spoken to my product and development team and they   suggest for you not to consume that product. Having the product out   for 16 hours not refrigerated isn’t a good thing so we wouldn’t   recommend for you to consume it.       Having said that you also stated that you re froze the product which   isn’t a good thing to do since the product thawed.      We believe 8   hours would be sufficient enough to thaw this product so we don’t   recommend you consuming this product.      I hope I was able to answer your question. If for any reason you have any further   questions/concerns please feel free to contact me as I am willing to   assist you with any information you may need.      Black River Angus Ltd   1-888-422-9656


happening or done without involving other people, actions, etc. in between and we can form it into an adverb "directly"  Ex: look directly into his eyes  but "directly" is also an adverb  : without involving other people  are "Look directly into his eyes" and "Look direct into his eyes" the same?  I would think "Look direct into his eyes" is not common or strange but I am not sure although you can see 800 results when googling "Look direct into his eyes"


I recently installed Pidgin and tried to install pidgin-facebookchat. Ubuntu software center now says that pidgin is corrupt so I press repair but nothing gets fixed. I've tried sudo apt-get purge pidgin but I get this error:  Reading package lists... Done Building dependency tree        Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies:  pidgin-data : Breaks: pidgin-facebookchat (< 1.69-2) but 1.69 is to be installed  pidgin-libnotify : Depends: pidgin (< 1:3.0) but it is not going to be installed                     Depends: pidgin (>= 1:2.10) but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).   And sudo apt-get -f install results in this error  Reading package lists... Done Building dependency tree        Reading state information... Done Correcting dependencies... Done The following packages were automatically installed and are no longer required:   language-pack-kde-zh-hans-base firefox-locale-zh-hans language-pack-kde-en kde-l10n-engb   language-pack-zh-hans-base kde-l10n-zhcn language-pack-zh-hans language-pack-kde-zh-hans   language-pack-kde-en-base Use 'apt-get autoremove' to remove them. The following extra packages will be installed:   pidgin-facebookchat The following packages will be upgraded:   pidgin-facebookchat 1 upgraded, 0 newly installed, 0 to remove and 31 not upgraded. 1 not fully installed or removed. Need to get 0 B/39.8 kB of archives. After this operation, 139 kB of additional disk space will be used. Do you want to continue [Y/n]? y dpkg: warning: there's no installed package matching pidgin-facebookchat:amd64   How can I uninstall Pidgin from my computer?, It is also blocking other applications from being installed.


You've reached your limit of 0 GPUs NVIDIA K80 when start an instance with gpu on gcp

When I start a instance with gpu on google cloud platform, it shows me the error that You've reached your limit of 0 GPUs NVIDIA K80.   Anyone who can give me some tips about this, thanks in advance.


Is the perimeter of a nested convex set smaller than the perimeter of containing sets?

Prove/Disprove:     $\forall S' \subset S\subset\mathbb R^2$ such that $S',S$ are convex and have finite area, the perimeter of $S'$ is smaller than the perimeter of $S$.   e.g. $S$ could be the unit square and the claim suggests that any convex shape inside the square has perimeter $\leq 4$.


I have two SQL Server tables, EmployeeMst and EmployeeHistory  EmployeeMst is my master table, and EmployeeHistory is my record table.  I store comma-separated values in EmployeeHistory  Now I want to get employee names with use of a T-SQL query  My table EmployeeMst  EmpNo   EmpName --------------------- 1       abc 2       xyz 3       apple 4       banan 5       apk 6       ico 7       exe 8       botle 9       dev 10      tbl 11      col 12      fun 13      dbo 14      xnb 15      png 16      jpgn 17      pngns 18      dknd 19      dnckd 20      dnicnd   EmployeeHistory:  EmpYear    EmpNo --------------------------------- 2010       1,2,3,10,11,12,13 2011       1,2,3,4,5,6,16,17,18   Now i want output as below  OUTPUT:  EmpYear  EmpNo   EmpName 2010      1       abc 2010      2       xyz 2010      3       apple 2010      10      tbl 2010      11      col 2010      12      fun 2010      13      dbo 2011      1       abc 2011      2       xyz 2011      3       apple 2011      4       banan 2011      5       apk 2011      6       ico 2011      16      jpgn 2011      17      pngns 2011      18      dknd   There are so many comma-separated values in EmpNo column


Delete files and directories by their names. No such file or directory

I need to delete all compiled data:   directories called build, directories called obj, *.so files.   I wrote a command   find \( -name build -o -name obj -o -name *.so \) -exec rm -rf {} \;   that goes through all the directories recursively and deletes all I need.  Why do I have such an output at the end? Maybe I should write a different command.  find: `./3/obj': No such file or directory find: `./3/build': No such file or directory find: `./1/obj': No such file or directory find: `./1/build': No such file or directory find: `./2/obj': No such file or directory find: `./2/build': No such file or directory


Cycles - Skybox using 6 projected images

I have generated 6 images that are of a sky projected onto the faces of a cube from the viewpoint of the centre of the cube (ie. a hopefully seamless skybox).  However I am having issues adding this texture to the world material. I have tried adding the images to the background via an Environment Texture but am unable to get anything even remotely close to looking correct.  Here are my problems:   The world material seems to be applied to a sphere but I want it to be a box (the program I am using to generate the sky generates a box) I don't know how to stitch my images together for use in the world material I'm not sure I'm even going about this the right way   I have searched and searched trying different things for most of the day so far but am coming up blank.


My Schengen tourist visa C is expired and I want to go back in my country

I want to go back to the Philippines, but I overstayed 8 months in Paris and my Schengen tourist visa C expired. Is there any problem if I go back to my country?


Rep indicator doesn't reflect rep changes in android app

Even if I have some upvotes on my posts, it looks the same always:    (I expect to see something like +[some rep], like on the site)  However when I click it, I can see my new rep changes highlighted.  Could the highlighting of rep indicator be implemented?


Maximum Likelihood Estimation Logistic Regression

If someone can explain how does Maximum Likelihood Estimation come into play while binary classification using Logistic Regression !  Thanks


Grandparent overloaded function in child

I need to understand why C++ don't allow to access Grandparent overloaded functions in Child if any of the overloaded function is declared in Parent. Consider the following example:  class grandparent{ public:     void foo();     void foo(int);     void test(); };  class parent : public grandparent{ public:     void foo(); };  class child : public parent{ public:     child(){         //foo(1); //not accessible         test();   //accessible     } };   Here, two functions foo() and foo(int) are overloaded functions in Grandparent. But foo(int) is not accessible since foo() is declared in Parent (doesn't matter if it declared is public or private or protected). However, test() is accessible, which is right as per OOP.   I need to know the reason of this behavior.


How to access a file's properties on Windows?

Last time I asked a similar question but that was about svn related versioning info. Now I am wondering how to query windows "File version" attribute about eg. a dll. I payed attention to wmi and win32file modules as well without success.


What is wrong with the following “proof” by Mathematical Induction? We will prove statements that all computers are built by the same manufacturer. In particular, we prove statements B(n) with n ∈ N, that “in any collection of n computers, all of the computers are built by the same manufacturer”. First check that B(1) is true, since with only one computer there is only one manufacturer. Now assume B(k); that is, in any collection of k computers, all are built by the same manufacturer. To prove B(k + 1) consider any collection of k + 1 computers. Pull out one of these computers, ‘HAL’ say, leaving just k computers, all of which must have the same manufacturer. Swap the ‘HAL’ computer with one of the others, so again there are k computers, so all must have the same manufacturer. Thus ‘HAL’ must have the same manufacturer as the others, hence all k + 1 computers have the same manufacturer; that is B(k + 1) must be true.


I've started getting back to java and I have a general question about defining a constructor for an object: I'm following a tutorial where he defines a HashSet object by the following statement:  Set<String> set = new HashSet<String>(list);   (list is a List object)  And I was wondering what's the difference if I use this statement:  HashSet<String> set = new HashSet<String>(list);   thanks!


I'm creating a HashMap as follows:  private HashMap <String, JSONArray> HiveMap; HiveMap = new HashMap <String, JSONArray>();   and also a private class variable to store some calculated data which will be put into the HashMap after the calculations are done:  private JSONArray hiveList;   After hiveList is calculated, I put the hiveList into the created HashMap (HiveMap):  HiveMap.put(hiveNode,hiveList);   When I print out HiveMap now, the output I get is as expected, with both the fields hiveNode and hiveList existing in the Hashmap. <"hiveNode":"hiveList">  After this is done, I assume that the data I put into the HashMap from hiveList is going to persist, so I clear the hiveList array using hiveList.clear();  But when I print the Hashmap after clearing hiveList, I see that the data from hiveList is gone from the HashMap as well.  Printing the HashMap after clearing hiveList results in: <"hiveNode": >  I don't understand this behavior, I would appreciate it if someone could shed some light on this.


I have to following example code. In this code I have two template classes each with a template function. One of the classes has an object of the other class and in the template function it calls the template of the other class.  template<typename T> class A{ public: A(T a): a(a){}  template< typename V> V foo(){     return this->a; }  private: T a; };  template<typename T> class B{ public: B( A<T> a): a(a){}  template<typename V>V foo2(){      return this->a.foo<V>(); }  private: A<T> a; };  int main() {      A<int> a(5);     double  aTest = a.foo<double>();     B<int> b(a);     double c = b.foo2< double >(); }   I need to provide the template element after the function call, because automatic type deduction does not work for functions, were only the return type depends on the template parameter. This works for aTest. But when I add the next two lines I get the following compiler error:  build/main.cpp: In member function 'V B<T>::foo2()': build/main.cpp:32:23: error: expected primary-expression before '>' token return this->a.foo<V>();                    ^ build/main.cpp:32:25: error: expected primary-expression before ')' token return this->a.foo<V>();


Does shoving a creature break its grapple on another?

A situation came up in my session where a fighter used his Shield Master Shove feature to shove a Giant Crocodile that was currently restraining another PC using it's bite+grapple ability.  I did a quick check at the time and did not find anything related to shove, although in the  condition description it states:     The condition also ends if an effect removes the grappled creature from the reach of the grappler or grappling effect, such as when a creature is hurled away by the thunderwave spell.   I ruled at the time that a shove would count in a similar way to being "hurled away" however I wasn't sure and said I would find more concrete information for the future.  I have searched high and low for somebody else asking this specific question but have yet to find it. I saw some reference to a Jeremy Crawford tweet about involuntary movement and grappling however I am unable to find it.  If a third party "shoves" a creature that is grappling another, does it only shove the grappler away, or does it move both the grappler and grappled?  I drew a diagram:   (; this question relates to if a third party shoves the grappler instead, so it's not a duplicate.)


Run a program without administrative privileges in Windows 7

My account in Windows 7 is an administrator account. When I open the Run box (WinKey + R), I am warned, "This task will be created with administrative privileges."    Is there any way to run programs as myself, but without administrative privileges when logged in as an administrator?


Do I have to submit Bank Statements for both Current and Savings account or is Current account enough?


Get rid of the chapter number when I refer to table

I use the following code for referring to an equation and table.  \let\originaleqref=\eqref \renewcommand{\eqref}{Equation~\originaleqref} \newcommand{\tref}[1]{Table (\ref{#1})}   When I refer to an equation, there is no number of chapetr. But when I refer to a table, there is a number of chapter.      Here is a small MWE.  \documentclass[]{OAGM} %% For the accepted, final version, set this to the correct value: \OAGMarXiv{1404.3538}  \usepackage{float} % fix the table \usepackage{bold-extra} \usepackage{amsmath,bm} \usepackage{color} \usepackage{amsmath,amsopn} \usepackage{bbm} %\usepackage{hyperref}  \usepackage{mathrsfs} \usepackage{tikz,pgfplots} \usepackage{listings} \usepackage{color} %\usepackage{breqn}  \usepackage{caption} \usepackage{subcaption} \usepackage{epstopdf} %\usepackage[titletoc,toc,title]{appendix} \usepackage{mathtools}  \usepackage{tabularx} \usepackage{booktabs} \usepackage{natbib } \usepackage{graphics} \usepackage{amsfonts} \usepackage{mathtools}    \begin{document}  \section{1} \subsection{2}  \begin{tabularx}{\textwidth}{XX} \toprule  a & b\\\midrule  \label{Tab a simple table}\end{tabularx}   I have to cite the table ~\ref{Tab a simple table}  \end{document}


How do I fix "malformed line" errors when trying to run commands in apt?

Is it that i am missing cretin functions that Debian had, this is just Ubuntu on a 64 bit Intel processor when running any apt scrip like an sudo apt-get install $ sudo apt-get install python-setuptools python-virtualenv python-dev  E: Malformed line 2 in source list /etc/apt/sources.list.d/100-ubnt-unifi.list (type) E: The list of sources could not be read. 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 had this same problem with my ARM processor and the dpkg files but it was different. what going on because because i am not sure if it just missing something about the Debian interface or maybe some bash scripting but i would like to know . i saw that the fix isnt hard but last time i did a fix from what i saw cold be done i lost the ability to go on youtube. but that just might be the internet i have that allows me to surch for the answer. i cant really connect to the wifi, i need an inscription key. it on the wifi box but i not sure where it is located in the house and i am not quite sure if i need it. im leaving soon, nut im just looking for a apt-get fix for any other insulation of any 64 bit programs to run like virtual box. --update-- i already did something to where the text editor doesnt come up the same but you are supposed to put these command first. sudo cp /etc/apt/source.list  /etc/apt/source.list.old sudo cat -n /etc/apt/source.list | grep 2 sudo gedit /etc/apt/source.list on the second command right where it says "grep 2" you are supposed to put the number of lines you have that are malformed into the command. and i believe you are supposed to put a number sine where the link starts in the test editor followed but a space and then hit save. on your terminal it should say something like this.. $ sudo gedit /etc/apt/source.list ** (gedit:3452): WARNING **: 21:16:30.900: Set document metadata failed: Setting attribute metadata::gedit-position not supported once it does that exit out of text editor and start a new terminal and start a apt-update && upgrade to see if you can source code an update. but beacuse i fail to put in the right code at the right time i was wondering if i could just copy and past what it should look like in the text editor and save after i put in a $ sudo gedit /etc/apt/source.list after the command or maybe i should just uninstall and reinstall the OS to see if i can fix my issue. $ sudo cp /etc/apt/source.list  /etc/apt/source.list.old cp: cannot stat '/etc/apt/source.list': No such file or directory $ sudo cat -n /etc/apt/source.list | grep 2 cat: /etc/apt/source.list: No such file or directory $ sudo gedit /etc/apt/source.list


Does this series diverge: $(\sqrt 2-\sqrt 1)+(\sqrt 3-\sqrt 2)+(\sqrt 4-\sqrt 3)+(\sqrt 5-\sqrt 4)+\dots$?

$$(\sqrt 2-\sqrt 1)+(\sqrt 3-\sqrt 2)+(\sqrt 4-\sqrt 3)+(\sqrt 5-\sqrt 4)…$$  I have found partial sums equal to natural numbers. The first 3 addends sum to 1. The first 8 sum to 2. The first 15 sum to 3. When the minuend in an addend is the square root of a perfect square, the partial sum is a natural number. So I believe this series to be divergent.  Am I right? Have I used correct terminology? How would this be expressed using sigma notation? Is there a proof that this series diverges?


The description environment allows an optional heading, like \item [<heading>] text, to be used. By default this makes the text <heading> bold.  I'm having the issue that this style of heading text is overriding my \textsc{}.  Why won't the description environment honor my \textsc{}?  Here's a picture:        And a MWE:  \documentclass[12pt]{book}  \begin{document}  This is normal text. \textsc{This is in small caps.}  \begin{description} \item [\textsc{Why not small caps?}] Why isn't the text at left in small caps? \end{description}  \end{document}


In earlier Windows versions when updates were downloaded they were automatically installed the next time the PC was shutdown (and powered back on later). With Windows 10 this option seems to be gone. I can manuall trigger a restart and installation by using the button under "Windows Update" or I can let Windows reboot automatically when my PC "is not in use" (whatever that means) but I can't configure it so that the Updates get installed automatically the next time I shut down the PC.  Is there a way to get the previous behaviour back?


Pronunciation of the second syllable in “ancient” and “conscience”

I have looked up the pronunciation of these two words, ancient and conscience, in the Oxford Advanced Learner’s Dictionary as well as other online dictionaries such as dictionary.com and dictionary.cambridge.org. Their pronunciations are given as /ˈeɪnʃənt/ and /ˈkɒnʃəns/. However, I have heard a lot of American people pronounce them as /ˈeɪntʃənt/ and /ˈkɒntʃəns/, meaning they pronounce the starting sound of the second syllable as /tʃ/ instead of /ʃ/. Is this considered a mispronunciation by some people or is it actually a correct pronunciation in American English?


I have installed Ubuntu 18.04 LTS on my HP Pavilion series laptop. After installing this version of Ubuntu, right click is not working of my touchpad. How can I solve this?  BTW:  does not have any solution which which is working for me. PS:- Problem remains after selection area in gnome-tweak-tool


What's wrong with this argument that aerodynamic lift really does rely on Bernoulli?

There is a grade-school explanation of how a wing works that goes approximately like this (although I'm leaving out an erroneous bit):     Because of the geometry of the way the wing meets the air, air accelerates as it goes over the top of the wing. There is something called Bernoulli's Principle that says that the pressure of a fluid decreases as its velocity increases. Because the pressure against the top is less than the pressure against the bottom, there is lift.   The oft-included erroneous bit is a claim about why the air speeds up over the top. The claim is that the air along the top has to make it over in the same length of time that it would have taken to go along the bottom. Since it has a longer trip over the top, the story goes, it has to go faster. This is not the right reason at all. There is no rule  of equal transit time and, in fact, the air along the top of the wing takes less time to get to the trailing edge.  People often point to that error and say it shows that the Bernoulli effect is not a correct explanation for flight. For instance,  makes the assertion that the Bernoulli effect is "at best a minor contribution to the actual lift", and none of the answers contradict this. But seems to me that the true situation only makes the Bernoulli effect even more important, because the acceleration of the air stream is greater than you would think if you believed the equal-transit-times story. Why is this wrong?  I also hear that it isn't the Bernoulli effect, it's that the wings redirect the air downwards. But it does not seem to me that those two explanations are mutually contradictory. If they are, I would like to understand that as well.


tput in a cron job does not output bolded text

I comeback with a very strange behavior  when we run this command on Linux redhat machine  echo "$(tput bold)" start write to log  "$(tput sgr0)" >> /tmp/log.txt   we get ended bold text in /tmp/log.txt  more /tmp/log.txt start write to log  <----- BOLD TEXT   but when we run it from cron job under /etc/cron.d   */1 * * * * root [[ -f /home/mng_log.sh ]] &&   echo "$(tput bold)" start write to log  "$(tput sgr0)" >> /tmp/log.txt   then the text in /tmp/log.txt isn't bold  why the cli from cron job not write the bold test ?


How do I get an image path from field preprocess function

After 3 hours of searching the web for this I gave up...  I have added a "banner image" field to the basic page. I want to use the image as a background. I wanted to capture the image path in a preprocess_field function but I tried every possible methods on the \Drupal\image\Plugin\Field\FieldType\ImageItem object and can't seem to find the way to get the path.  mytheme.theme:  function mytheme_preprocess_field(&$variables){   if($variables['field_name'] == 'field_banner_image'){     /** @var \Drupal\image\Plugin\Field\FieldType\ImageItem $field */     $field = $variables['element']['#items'][0];             $variables['banner_url'] = $field->getValue(); // not working, tried everything...   } }   Then in my field--field-banner-image.html.twig:


Xcode is the default editor for many file types on Mac, and I'd like to switch these to VSCode. While it's not difficult to manually change the default editor for a single file type, is it possible / is there a tool available for changing many? Even something as simple as "for every file type currently defaulting to Xcode, change to VSCode".


W:Failed to fetch   404  Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.


Possible Duplicate:        Is there a maximum limit on the length of tags? I noticed that the tag for SQL Server Management Studio is truncated to sql-server-management-stu.  It seems like this should be an easy thing to correct, if not to allow the creation of new longer tags, but to correct existing tags that have been truncated.


Appropriate Method for Generating Confidence Intervals for Neural Network

I am attempting to generate confidence intervals for a neural network, according to the article , one would bootstrap from the training set to generate new models several times, and then apply the model to the validation set n number of times to generate the relevant statistics.  Is there another way to generate confidence intervals that doesn't require retraining the network? Retraining the network is very computationally intense and requires a great deal of time-- so I would like to avoid it if at all possible.  Thanks so much!


Finding the commit that has certain version of a binary file

Is it possible to find in which commit a certain version of a binary file is?   I'm thinking something like:  $ sha1sum mybinaryfile 2fc60fcc4a92a2b171db333b482dabf94c82d51f  mybinaryfile  $ git tell-me-which-commit-has 2fc60fcc4a92a2b171db333b482dabf94c82d51f commit fc8d840778024557faf6bd2d93c56a2b4be55ab1 Author: author <author@here.com> Date:   Wed Feb 19 15:41:06 2014


I'm pretty sure there isn't a way-explicitly-offered-by-the-game to unset and reinvest health, stamina, and/or magicka advancements, but I'm also curious about exploits, console commands, and/or mods.


Why don't the Ubuntu repositories have the latest versions of software?

Why are packages in the official Ubuntu repositories older than the latest (upstream) versions from Debian Sid, PPAs, the authors, etc.?


Biblatex and authoryear not working as expected

I'm using MikTex 2.9.5105 with TeXnicCenter 2.02 Stable and have no to basic knowledge of LaTeX.  I want my citations to have the form      Lorem ipsum dolor sit amet (Kosiol 1961, S. 319) consectetuer   adipiscing elit Kosiol (1961).   In the preamble  \usepackage[     style=authoryear,     isbn=false ]{biblatex} \addbibresource{EndfassungLiteraturDatenbank.bib}  ...  \printbibliography   In the .bib  @Article{Kosiol1961,   Title                    = {Modellanalyse als Grundlage unternehmerischer Entscheidungen},   Author                   = {Kosiol, E.},   Journal                  = {ZfbF 13},   Year                     = {1961},   Pages                    = {318-334},    Owner                    = {Karl},   Timestamp                = {2015.04.09} }   In the text  \parencite[319]{Kosiol1961} --> expecting "(Kosiol 1961, S. 319)" \textcite[319]{Kosiol1961} --> expecting "Kosiol (1961, S. 319)"   Current output after 4 times of compilation  \parencite[319]{Kosiol1961} --> (Kosiol1961) \textcite[319]{Kosiol1961} --> Kosiol1961   The bibliography is not printed at all.


Need to edit this XML file with powershell

I have an XML file and need to change the value to False. Is there a way to do this with powershell?  <setting name="RecordChatHistory">     <value>True</value>   </setting>


How to determine the arc length of ellipse?

I want to determine the length of an arc from the ellipse in the picture below:    How can I determine the length of $d$?


Classification of connected subsets of the real line (up to homeomorphism)

I want to describe, up to homeomorphism, all the proper connected subsets of $\mathbb{R}$. I know the theorem that $A \subset \mathbb{R}$ is connected if and only if $A$ is an interval.  So consider the following intervals:  $[a,b), [a,b], (a,b)$  Note $[a,b)$ is not homeomorphic to $[a,b]$ (compactness argument) and $[a,b)$ is not homeomorphic to $(a,b)$ (by connectedness). Similary $[a,b]$ is not homeomorphic to $[a,b)$ (remove a,b from [a,b]).  Now any ray $(a,\infty)$ is homeomorphic to $(1,\infty)$ which is homeomorphic to $(0,1)$ and $(0,1)$ is homeomorphic to $(a,b)$. Similarly the ray $[-a,\infty)$ is homeomorphic to $(0,1]$. So I think this covers all the cases.   So I believe the answer is $3$, yes?


What does the Rebel Alliance logo represent?

This insignia is pretty common and recognizeable, but I'm not sure I have any idea what it represents. It looks sort of like the shape of a ship, but the Rebellion doesn't have any ships of this shape that I can recall.    So, what is it?


Removing an element from an Array (Java)

Is there any fast (and nice looking) way to remove an element from an array in Java?


I recently , but didn't receive an explainer badge. I found a couple of questions from people who appeared to have the same problem as I do, but in the end it turned out they just didn't meet all the conditions for the badge.   The time between my edit and my answer was 1-2 hours. Following all the bullet points for an explainer badge from :        The question was asked by someone other than the answerer      Yes, I didn't ask the question        Neither the questions nor the answers are deleted      Also true        The questions are not closed      The question is open        The answers score > 0      I have a score of 1        The question edits changed either body, titles, or both      I edited both the title and body (I also added two tags, but that shouldn't be an issue..)  Any ideas why I didn't get my badge? Am I just too impatient?


If $p$ is prime and $p$ $\equiv$ $1$ (mod 4), then the congruence $x^2$ $\equiv$ $-1$ (mod $p$) has two incongruent solutions...

Question: If $p$ is prime and $p$ $\equiv$ $1$ (mod 4), then the congruence $x^2$ $\equiv$ $-1$ (mod $p$) has two incongruent solutions given by $x$ $\equiv$ $\pm$ $\frac{(p-1)}{2}$!(mod $p$).   I noticed that the congruence $x^2$ $\equiv$ $-1$ (mod $p$) fits the form of Wilson's theorem but can't figure out how to modify/change the congruency to fit Wilson's theorem. Sorry if this is a duplicate, I wasn't able to find any other question similar to this one but it could just be my incorrect usage of MathJax.


Hard and painful stool in infant - is this normal?

On several different occasions my daughter (7mnths-12mnths) was trying to poop, but then she would start crying like she was in pain.  When I checked her diaper she had a big hard fat poop coming out, but it seemed stuck. I've had to actually help her push it out.   Is that normal?  What can I do to help her feel less uncomfortable?


I have used Blender and Unity 3D in Windows 8. Recently I have started using Ubuntu 17.04. Can anyone tell me the procedure to install Unity 3D Game Engine.  Thank You


Whether ubuntu touch run on any device that running android previously?

I came across some youtube videos that they mentioned ubuntu touch can be installed in any device that supports android. is it true? then why it is mentioned separately that only nexus or some bq acquaris can only run ubuntu?


Why does Darth Vader raise his prosthetic arm when channeling the Force?

Many Force users channel their powers (pull, push, lightning) through their hands. But in the case of Darth Vader, this does not seem to make sense. Because there is nothing there. His limbs are prosthetic and contains no midichlorians. Could there be a reason other than writer oversight?  Triggered by:


Properties of the greatest common divisor: $\gcd(a, b) = \gcd(a, b-a)$ and $\gcd(a, b) = \gcd(a, b \text{ mod } a)$

Prove that (a) gcd(a, b) = gcd (a, b – a) (b) Let r be the remainder if we divide b by a. Then gcd(a, b) = gcd(a, r).  I solved part a like: Assume a=pcommonpa b=pcommonpb gcd (a,b) = pcommon b-a = pcommon*(pb-pa)  So: gcd(a, b-a) = common again But I need help for part b guys I can solve it but I need a mathematical expression.


When starting my Outlook 2013 application, I got the below error.  How can I get rid of it and get my Outlook back to work?


I really liked the 2x2 workspaces from ubuntu 14.04 LTS but on 18.04 LTS they only made a vertical one. I could still live with this if this was the only difference but my main problem is the fact that once I'm in one of my workspaces and I want to toggle in between windows I still have to toggle through all the other windows from the other workspaces.  Is this solvable by just changing some settings?  Or do I have to download separate software?  Thanks in advance!  PS: I'm not a very experienced linux user.


The jury (takes / take) their seats in the courtroom.  I understand that 'the jury' refers to a singular group but does this apply when it is referred to as a plural in 'their'? Thanks.


What is the infinite product of (primes^2+1)/(primes^2-1)?

I have shown that the infinite product $$\prod_{p \in \mathcal{P}}\frac{p^2+1}{p^2-1}$$ is equal to $\frac{5}{2}$ (pretty remarkable!). I have checked this numerically with Wolfram Alpha for up to $500000$ primes and it seems true.  I was wondering if this result is recorded anywhere?  Also if true, does this mean that there aren't infinitely many primes of form $p^2+1$?


I understand that $1/\pi$ is the pdf for uniform probability on the unit disk (with suitable constraints on $x^2 + y^2 =1$), because the area for radius 1 is just $\pi$. However, how is the double integral set up to get a value of 1 when integrating? I have worked with various combinations of 0,1, $\sqrt{1-x^2}$, etc. as the limits of integration and haven't been able to get a combination that works yet so that the calculation of the double integral comes to 1.


$\mathbb P^n\times \mathbb P^m\not\cong \mathbb P^{m+n}$

I know that $\mathbb P^{1}\times \mathbb P^1$, as a projective variety, is not isomorphic to $\mathbb P^2$.  Now, I think that also $\mathbb P^n\times \mathbb P^m$ is not isomorphic to $\mathbb P^{m+n}$ for any $m,n$, but why? For the above statement I use the fact that any two lines in $\mathbb P^2$ intersect, but in general?  Thank you in advance.


The correlation coefficient captures only strength linear dependence, due to the normalised covariance, what does that mean?

I understand that correlation coefficient can only capture the linear dependence. I have just read a book saying that:     “As a normalized covariance, the correlation coefficient captures only one particular aspect of dependence: The strength of linear dependence between the underlying random variables.”    I really do not understand: Why does normalized covariance lead the correlation coefficient to only captures the linear dependency structures? So, is that mean, without normalization, we can measure non-linear dependency?!


How to install AMD drivers on Ubuntu 14.04

I am using HP Pavilion G series Model. I've been trying to install the AMD Catalyst driver on my laptop but it's not working.   Please give me a step-by-step procedure to install the AMD driver.


What are principal component scores (PC scores, PCA scores)?


Should questions be added to the reopen queue as soon as they're edited by the original author?

I'm listening to  and David mentioned that posts need one reopen vote to be added to the reopen review queue.  He also mentioned that questions almost never get reopened once they're closed.  Should more questions be added earlier to this queue.  I think that after a question is closed, if the original author makes a substantial edit to the question, it should be eligible for reopening.  Should questions that meet this criteria be added immediately to the reopen review queue (before anyone casts a reopen vote)? Notes: Currently people are encouraged to flag a post for a moderator to review once they've edited their closed question, but  this really doesn't happen very much, I'd really like to see this automated so it happens more often, and I'd like to see a bigger cross-section of the community looking at these than just moderators.  Additional note: I know that all the OP has to do is vote for their own question to be reopened for it to be added to the queue, but this doesn't always happen (it requires 250 reputation, and sometimes people just don't do it).  Maybe just automatically casting the reopen vote for them would be enough to implement this?  Or, as Tim Stone suggests in the comments, maybe just letting them know that voting to reopen their own post will place it in a queue for others to review would see more posts added to the queue?


I am using GNU sed 4.2.2 and after searching cannot find out the reason sed behaves oddly in some situations:  I have a directory with the following:  foofile.txt barfile.txt bazfile.txt config/   Case 1  sed -i 's/foo/bar/g' *.txt   This works as I expect.  It replaces all the "foo"s with "bar"s in the three regular files.  Case 2  sed -i 's/foo/bar/g' * sed: couldn't edit config: not a regular file   It replaces "foo" with "bar" in barfile.txt and bazfile.txt, but not in foofile.txt.  I assume it goes through the list of files expanded from the * alphabetically, and when it hits config/ it errors and exits.  Is there a way to have sed ignore errors and continue processing files?  Case 3  for file in $(find . -maxdepth 1 -type f); do sed -i 's/foo/bar/g' <"$file"; done sed: no input files sed: no input files sed: no input files   Could someone please explain why sed does this?  Why does it say there's no input file when it's being given one?  I know that I can use the following but I'm asking why sed acts this way, not how do I solve this one use case.  find . -maxdepth 1 -type f -exec sed -i 's/foo/bar/g' {} \;


Why according to distribution graph it's normally distributed, but Jarque-Bera test shows non-normally distributed?

I am working on Kaggle's house pricing exercise and I cannot understand something. I watch and read articles on normality tests, and more specifically JB test, but I cannot understand why according to my understanding of that test I need to reject the null hypothesis (which is the normal distribution) and conclude it is a non-normal distribution when the distribution graph shows a very close result to a normal distribution?  Jarque-Bera test = 171.236, with p-value 6.55459e-038   So from that result, if I am correct, I reject null and conclude the data are not normally distributed. But then this is the distribution graph (n=1460):      PS. The Y var is log of price and the x is year. Could the problem be that year is not a continuous variable?


I want to know how to make the taskbar at the bottom of the screen disappear.    This taskbar appeared after I installed some theme. How can I make that taskbar disappear?  I thought this was editable in gnome-tweak-tool, but I can't find the relevant tab.  (It's not the Dock that's installed by default in Ubuntu)  OS: Ubuntu 17.10 Artful Aardvark


Significant interaction but non-significant slopes?

I have conducted a moderation analysis as follows:  x (continuous independent variable, centered) m (continuous moderator, centered) y (dependent variable)  By entering x, m, and the product of x and m (x.m, interaction factor) into simultaneous regression, I get an overall significant model, with significant regression coefficients for x (beta x=0.273), for m (beta m=0.215) and for x.m (beta x.m=-0.034), all p<0.05. I understand that this means that m is a significant moderator of the relationship between x and y.   However, when I try to plot simple slopes at high (+1SD) and low (-1SD) levels of m, both slopes are nonsignificant (unstandardized slope 0.029, t=0.314 and p=0.89 for high m, and unstandardized slope 0.1349, t=0.902 and p=0.37 for low m). I believe this means neither slope is different from zero.  My question is, does this invalidate my interaction? Should I therefore not consider m a significant moderator of y on x? If the interaction is still valid, how do I report the results of the simple slope analysis?


Negatives to increased credit card spending limit?

My credit card company is giving me credit increases despite me not asking for them. Are there any drawbacks to an increased spending limit?   For reference I spend 25$ per month on this card, pay it off in full every month, and use it when traveling out of the country.


How python dictionary operations work at low level?

Python dictionaries use hashing to get O(1) complexity for certain operations.  I know a hash is a function that converts an inmutable object into a unique identifier of a certain length of bits.  However I still dont' understand how certain operations work at a low level.  At a low level, I could understand that if the hash function would translate a key into a memory position, then getting the dictionary value for a certain key would be just hashing that key, going to that memory position and retrieving the value. But I suspect this is not how it really works, basically because the entire range of possible hashes would have to be allocated into memory.  Checking if a dictionary has a certain key is also O(1), and I really don't figure out how it's done to be O(1) using hashes. Sure I have a hash, now what? I still need to check if this hash value belongs to a list of hash values right? And this is not O(1).  Is there a tutorial or documentation where it really explains at a low level how the different operations of dictionaries involving hashes are done?   All tutorials I found explain how to use dictionaries, but I want to know how they work.  I'm not interested in the hashing algorithm itself, but what comes after the hash is calculated.  Thanks