jQuery .on('click') events not firing after the DOM has been restructured
Event binding on dynamically created elements?
The usual Schrodinger Lagrangian is $$ \tag 1 i(\psi^{*}\partial_{t}\psi ) + \frac{1}{2m} \psi^{*}(\nabla^2)\psi, $$ which gives the correct equations of motion, with conjugate momentum for $\psi^{*}$ vanishing. This Lagrangian density is not real but differs from a real Lagrangian density  $$ \tag 2 \frac{i}{2}(\psi^{*}\partial_{t}\psi -\psi \partial_{t}\psi^{*} ) + \frac{1}{2m} \psi^{*}(\nabla^2)\psi $$ by a total derivative.  My trouble is that these two lagrangian densities lead to different conjugate momenta and hence when setting equal time commutation relations, I am getting different results (a factor of 2 is causing the problem). I can rescale the fields but then my Hamiltonian also changes. Then applying Heisenberg equation of motion, I don't get the operator Schrodinger equation.   Is it possible to work with the real Lagrangian density and somehow get the correct commutation relations? I would have expected two Lagrangians differing by total derivative terms to give identical commutation relations (since canonical transformations preserve them). But perhaps I am making some very simple error. Unless all conjugate momenta are equivalent for two Lagrangians differing by total derivatives, how does one choose the correct one?   I guess the same thing happens for other first order systems like Dirac Lagrangian also. Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$ I'm trying to prove that ${n \choose r}$ is equal to ${{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$.  I suppose I could use the counting rules in probability, perhaps combination= ${{n} \choose {r}}=\frac{n!}{r!(n-r!)}$.  I want to see an actual proof behind this equation.  Does anyone have any ideas? Here is a minimal example that showcases my problem:  \documentclass{article}  \usepackage{amsthm} \usepackage{hyperref} \usepackage{cleveref}  \newtheorem{thm}{Theorem} \newtheorem{lem}[thm]{Lemma}  \begin{document}  \begin{lem} Lemma \end{lem}  \end{document}   The warning I get is the following:  [1pdfTeX warning (ext4): destination with the same identifier (name{thm.1}) has been already used, duplicate ignored  \AtBegShi@Output ...ipout \box \AtBeginShipoutBox                                                    \fi \fi  l.16 \end{document}                    {&lt;install dir&gt;/MiKTeX/2.9/pdftex/config/pdftex.map}]   I know that it is just a warning and that, my document will still work perfectly fine with regards to cross-referencing and hyperlinking, but I would still like to know why I am getting this warning and if anything can be done to fix it without removing functionality of the included packages.   Bonus question: Whats going on behind the scenes when this warning (or any generic 'destination with the same identifier (name{XXX.YYY}) has been already used, duplicate ignored') is produced, as this is not limited to theorem environments.  From log file:  Package: amsthm 2004/08/06 v2.20 Package: hyperref 2011/04/17 v6.82g Hypertext links for LaTeX Package: cleveref.sty 2011/03/22 v0.17.9 Intelligent cross-referencing Package cleveref Info: `hyperref' support loaded on input line 2157. Package cleveref Info: `amsthm' support loaded on input line 2300. Is the function strcpy always dangerous? Dirac equation as Hamiltonian system Let us consider Dirac equation $$(i\gamma^\mu\partial_\mu -m)\psi ~=~0$$ as a classical field equation. Is it possible to introduce Poisson bracket on the space of spinors $\psi$ in such a way that Dirac equation becomes Hamiltonian equation   $$\dot{\psi}~=~\{ \psi,H\}_{PB}~?$$  Of course, such Poisson bracket would be graded (super Poisson bracket), but if it exists this would explain on classical level why $\frac{1}{2}$-spinors correspond to fermions. Systemd backed tmpfs | How to specify /tmp size manually I mount /tmp on tmpfs using:  sudo systemctl enable tmp.mount sudo systemctl start tmp.mount   But this way /tmp takes up all the free RAM:  $ df -h /tmp Filesystem      Size  Used Avail Use% Mounted on tmpfs           3.9G   12K  3.9G   1% /tmp $   How do I tell systemd tmp.mount to use only 1G? I know I can alternatively not use systemd and manually add an entry to /etc/fstab and specify the size there. But I don't want to do that. I want to use systemd backed tmpfs. In Harry Potter, we know ghosts became ghosts when they are too afraid of death to go on - I thought about it and I'm quite certain they all go to their own version of Harry's King's Cross and become ghosts when they return as Harry did.  So can they return there? Once they've been a ghost long enough that they no longer fear death, can they move on? Show that  $$t(n) = 1 + \sum_{ j=0}^{n-1} t(j)$$  is the same as  $$t(n) = 2^n$$  Initial condition $t(0) = 1$ Is it a bad practice to catch Throwable? $\hbar \rightarrow 0$ in quantum mechanics We often see a limit $\hbar \rightarrow 0$ in quantum mechanics and sometimes it's related with symmetry breaking. Can someone briefly write the story behind this limit? Adding a link with a space in front causes the link to not work When you paste a link into the "Insert Hyperlink" box, it adds it automatically as a citation link:  [Example 1][1]    [1]: http://example.com   But when you paste a link starting with a space , it tries to URL encode it, to change the space to %20, and then sticks a http:// on the front to make it a valid link:  [Example 2][2]    [2]: http://%20http://example.com   This, however, means the link doesn't work.    Please could leading whitespace be stripped from the URL? How to compute $k$'th roots $\!\bmod n$? I have the following equation: $$ n \equiv M^k\mod(b) $$ where n, a, b are integers, and M is unknown. How do I solve this equation to find the M value? Those a and b are public keys of the RSA algorithm and n is the result of encryption. I need to find the encrypted message. How can I stand on the ground? EM or/and Pauli? Why don't I get a link error when I provide my own malloc and free? How do I log every command executed by a user? I want to monitor all user's activity in my server.  Even when the user executes a shell command from some editor like vim I want to see them in the log file.  I have checked the tool acct but it is not listing the complete commands. (Please correct me if I have missed some options which does already).  Which Linux tool I should be looking at to solve this problem? I want to color sketches in Photoshop, but when I prepared the sketch (using Levels, Hue, and other modifications) to turn it into workable line art, some details were missing. I think it depends on how you draw your sketch.  What are important steps for drawing a sketch (with pen or pencil) that is to be colored in Photoshop? A step-by-step instruction would be appreciated.  For instance, here it is the sketch    This is after my preparations in Photoshop Unable to shrink transaction log file in SQL Server I moved to a new company recently wherein they have 2 databases in a SQL server of size 20-25 GB. I'm unable to shrink the log file of the databases. Transaction log backup of the databases are set to run every 30 mins from 6 AM-7PM. They are of size 10 and 2 Gb respectively. I tried to shrink it around 8-9 PM last night but I was not able to do.  The log_reuse_wait column stated it's waiting on a log_backup. I tried taking couple of log backups which didn't help. I ran DBCC OPENTRAN but there are no open transactions.  Also, this morning even after the Tlog backups started at 6:00 AM till now(10:30) it still shows LOG_BACKUP in log_reuse_wait column. And no OPEN TRAN as well.  When I researched on this I found this article from Paul Randal:   It states that if the DB is small and all the content of tlog file is in same VLF it couldn't truncate. I have some 300-400 VLFs in the Databases. So that doesn't make sense here as well.   One thing I noticed that every morning at 6 AM the tlog is a little bigger than the other ones. So I'm thinking to check with the lead DBA to run tlog round the clock. Other than that, I would like to see why is this happening and Am i missing anything.  I tried to shrink with the below command:  Use DB1 go DBCC SHRINKFILE(2,10)  GO   Note: It's SQL 2012 instance running 0n 2012 compatibility Omission of "the" in "elected him president" and "made captain" Why is there no the before president and captain?     They elected him president.       She was made captain of the team. Why do first order languages have at most countably many symbols? Every proof that I read seems to assume that $|L|\leq\aleph_0$. But then how do you model things like field over $\mathbb{R}$ without running out of variable symbols?  More importantly, how can I prove that $|L|\leq\aleph_0$? Plotting discontinuous functions without spurious vertical segments