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Useful notes for some of my answers:

CTAN lion drawing by Duane Bibby.

How do you accept an answer?](http://meta.tex.stackexchange.com/q/1852/3954)

minimal working example](http://www.minimalbeispiel.de/mini-en.html)

The demo option for graphicx simply replaces actual figures with black rectangles; do not use that option in your actual document.


9h
answered Changing the theorem's title style
9h
comment How to get tikzmark to work
@A.Ellett I added the code that will prevent the error in the first run using your second code.
9h
revised How to get tikzmark to work
added 226 characters in body
9h
comment How to get tikzmark to work
@A.Ellett yes, there is. Give me some seconds and I will add this to my answer. Regarding the .south operation, take into account that using \tikzmark doesn't really produce a node, so those modifiers won't work.
9h
revised How to get tikzmark to work
added 9 characters in body
9h
comment How to get tikzmark to work
@A.Ellett Please see my updated answer.
9h
revised How to get tikzmark to work
added 92 characters in body
9h
answered How to get tikzmark to work
1d
comment Disable formatting for a selection inside listing?
\begin{lstlisting}[mathescape=true,basicstyle=\mlttfamily\footnotesize] I am doing this for nothing. \end{lstlisting}.
1d
comment Showcase of beautiful wine bottle labels made with LaTeX/TikZ and friends
@MarcvanDongen Gladly! I was absent for the past months, but today I saw your message and I added the code as an entry: tex.stackexchange.com/a/208922/3954.
1d
answered Showcase TeX Typography for TUG's Calendar
1d
comment How do I use \bmatrix in a subfigure?
Inside floats, \label must always be used after \caption.
1d
answered How do I use \bmatrix in a subfigure?
1d
comment How do I use \bmatrix in a subfigure?
You need to specify a width in the mandatory argument for each of the subfigure environments; something like \begin{subfigure}[b]{.6\textwidth}...\end{subfigure}. It is not clear to me, however, why are you using subfigure for each matrix.
1d
answered Loops of different sizes
1d
answered How might I typeset the Fano plane in LaTeX?
1d
comment Problem with verbatim in a beamer frame
Yes, you're right. Both verbatim and semiverbatim are very basic verbatim environments; an option using the powerful listings package could be a better possibility here.
1d
comment Problem with verbatim in a beamer frame
+1. Another option (that I just suggested in a comment to the question) is to use beamer's own semiverbatim instead of verbatim; the former doesn't require an explicit fragile for the frame.
1d
comment Problem with verbatim in a beamer frame
Or use beamer's own semivarbatim environment instead of verbatim, as in \begin{ssemiverbatim}...\end{semiverbatim}.
2d
awarded  Nice Answer