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Why can't the Klein-Gordon equation explain the hydrogen atom but the Dirac equation does? Why can't the Klein-Gordon equation with a Couloumb potential describe the hydrogen atom?  Why can the first order Dirac equation explain it? What are the failures? Given $S \in B(Y^{*}, X^{*})$, does there exist $T\in B(X,Y)$ such that $S=T^{*}$? How to convert QString to std::string? What is potential energy truly? Show that $A\in\mathbb{C}_n$ is normal $\iff$ $tr(A*A) = \sum_{i = 1}^n|\lambda_i|^2$, where $\lambda_1,...,\lambda_n$ are the eigenvalues of $A$. Install a single specific package from future distribution I'm currently using precise. I need to upgrade a certain package (namely  and it's dependencies) to a newer version, which is currently found in raring (alfa at the time of writing this). How to do it ?  What will happen if I just add to my sources.list:  deb http://archive.ubuntu.com/ubuntu raring main   Will the next apt-get update / apt-get upgrade, upgrade most of my system to raring then ? Can't install Linux Headers (Kali Linux) I am trying to install Linux headers for Kali Linux on my machine and I have tried every possible solution on the internet but it always show "Unable to locate packages "  root@kali:/usr/sbin# apt-get install linux-headers-4.6.0-kali1-amd64 Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package linux-headers-4.6.0-kali1-amd64 E: Couldn't find any package by glob 'linux-headers-4.6.0-kali1-amd64' E: Couldn't find any package by regex 'linux-headers-4.6.0-kali1-amd64'   Here is my sources.list file :  # Regular Repositories deb http://http.kali.org/kali sana main non-free contrib deb http://security.kali.org/kali-security sana/updates main contrib non-free # Source repositories deb-src http://http.kali.org/kali sana main non-free contrib deb-src http://security.kali.org/kali-security sana/updates main contrib non-free   Uname -a output :   root@kali:/usr/sbin# uname -a Linux kali 4.6.0-kali1-amd64 #1 SMP Debian 4.6.4-1kali1 (2016-07-21) x86_64 GNU/Linux I'm self-studying a bit of complex analysis, and I'm attempting to figure out the following.   Suppose $\lim_{n\to\infty}z_n=A$. How can I show that $$ \lim_{n\to\infty}\frac{1}{n}(z_1+\cdots+z_n)=A. $$  Is there a clever way to write the limit to make it more approachable? Thank you. In SF1, Stop refreshing the embedded vf page on a layout Below is my VF page which is embedded on a layout. In SF1 mobile app, it's getting refreshed whenever we touch on it. How can I avoid refreshing the VF page while touching it on the screen? In Desktop it's working fine. Please provide your inputs. &lt;apex:page standardController=&quot;PremiseObj__c&quot; lightningStylesheets=&quot;true&quot;&gt; &lt;apex:includeLightning /&gt; &lt;apex:slds /&gt; &lt;div id=&quot;premiseServDetails&quot;&gt; &lt;/div&gt; &lt;script&gt; window.onload = function (){     $Lightning.use(&quot;c:PremiseObjUpdateApp&quot;, function() {         $Lightning.createComponent(&quot;c:PremiseObjUpdatecmp&quot;,                                    {                                         recordId : &quot;{!Premiserecord__c.Id}&quot;                                     },                                    &quot;premiseServDetails&quot;,                                    function(cmp,event) {                                        setTimeout(function() {                                            //document.getElementById('loading').style.display = 'none';                                        }, 3000);                                    });     }); } &lt;/script&gt; &lt;/apex:page&gt; miktex-makepk - PK font HieroB could not be created I am depressed, after trying to install HieroTeX with MikTex 2.9 and TeXnicenter for four weeks without succeeding. I installed hieroglf, it works perfectly, but has only 60 signs. I followed the main advices, so I created a folder texmf-Local , throwed in  the content of HieroTex3.5 and Hiero-Type1.3.1.4 , put the axmf , mf and sty files where I think they belong, put that directory  texmf- local in the path searched by Miktex, updated map and file databases fo Miktex. Still the files can be compiled but Hiero fonts are not found.  Te main errors I can detect from log are the following:   " No file egypto.sty.tex found" and  "  "miktex-makepk - PK font HieroB could not be created." and similar for other fonts Thanks MySQL Date Between Denoting the end of example/remark What is the etiquette to denote the end of an example or remark? For proofs, it's the QED symbol (white box). I know it's not necessary for everyone, but I would like to use it to break up the text a little. What should I use? A circle or filled box or what? Why log-transforming the data before performing principal component analysis? Im following a tutorial here:  to gain a better understanding of PCA.  The tutorial uses the Iris dataset and applies a log transform prior to PCA:     Notice that in the following code we apply a log transformation to the continuous variables as suggested by [1] and set center and scale equal to TRUE in the call to prcomp to standardize the variables prior to the application of PCA.   Could somebody explain to me in plain English why you first use the log function on the the first four columns of the Iris dataset. I understand it has something to do with making data  relative but am confused what's exactly the function of log, center and scale.  The reference [1] above is to Venables and Ripley, Modern applied statistics with S-PLUS, Section 11.1 that briefly says:     The data are physical measurements, so a sound initial strategy is to work on log scale. This has been done throughout. How can I access shared folders on an Ubuntu host and a Windows XP guest? What does the Y capacitor in a SMPS do? Name of the book/series based on magicians who tap into computer grid? Is it correct to hyphenate with compound premodifiers? If so, where is the hyphen placed? For example, "file system" and "related". Is it "file system-related"? It will appear as if it is a compound of "file" and "system-related", won't it? Frequently loaded packages: Differences between pdfLaTeX and XeLaTeX Until now, I have been compiling my LaTeX documents with pdfLaTeX. My standard document preamble includes the "usual suspects" for non-English speakers (, , ) and a bunch of other packages. Assuming I were to convert to XeLaTeX, what modifications of my preamble are advisable? I'm aware that the expansion=true option of the  package is not (yet) available for XeLaTeX, and that  is sort of a default package for OpenType fonts. What other packages (and package options) should be removed and, vice versa, incorporated when switching from pdfLaTeX to XeLaTeX? Do potions use concentration for their effects? Is there an optimal setting for the number of CPU cores exposed to a VM? VirtualBox, and possibly other VM software, allows the user to specify the number of CPUs exposed to the VM. In my particular case, I have a dual core CPU, with Windows 7 64-bit running natively, and Ubuntu 9.04 64-bit as the VM.  The help file suggests not setting this above the number of physical cores available. This makes sense. So, is it best allocating 1 or 2 CPU cores? Does this depend entirely on the native CPU load?