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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.


Jul
15
revised two horizontal lines in header
added 750 characters in body
Jul
15
answered two horizontal lines in header
Jul
15
awarded  Nice Answer
Jul
15
comment Array as subscript
This doesn't seem to be so disruptive: $s_{\mbox{\tiny$\begin{smallmatrix} 2 & 4 & 6 & 5 & 4 & 3 & 2 \\ && 3 \end{smallmatrix}$}}$ but I would think that using a matrix as subscript in in-line math is not the best choice.
Jul
15
revised Loss of figure subsection numbers when using mainmatter
added 2 characters in body
Jul
15
revised Loss of figure subsection numbers when using mainmatter
added final remark
Jul
15
answered Loss of figure subsection numbers when using mainmatter
Jul
15
revised Handling a too big matrix equation
new code, new image
Jul
15
revised Handling a too big matrix equation
added 33 characters in body
Jul
15
revised Table without counting ampersands
code formatting
Jul
15
answered Remove footnote marks from \listoftables
Jul
15
answered Handling a too big matrix equation
Jul
15
revised Handling a too big matrix equation
code formatting
Jul
15
comment Troubleshooting Code for 'Cases'
Yes. here they are: for displayed math: Why is [ … ] preferable to $$ … $$? and, for in-line math: Are ( and ) preferable to dollar signs for math mode?.
Jul
15
comment Troubleshooting Code for 'Cases'
In line math is different. For in-line math you can continue using $...$. The recommendation I made is for displayed math. There are a couple of answers here addressing this; let me see if I can find them.
Jul
15
comment Troubleshooting Code for 'Cases'
Don't leave blank lines in displayed math; don't use $$...$$ in LaTeX documents. The following works: \documentclass{article} \usepackage{amsmath} \begin{document} \[ \begin{cases} a, &\qquad n=1.\\Phi^{-1}x(n-1), &\qquad x(n)=x(n-1). \\Phi^{-1}x(n-1)+c, &\qquad x(n)=x(n-1)+1. \end{cases} \] \end{document}
Jul
15
revised Troubleshooting Code for 'Cases'
added 54 characters in body
Jul
15
comment Free cell alignment in a table
@farhad0011 You're welcome. Yes, it's a shame about tabu. By the way, don't forget that you can accept the answer that you consider best solved your problem by clicking the checkmark to its left; You've already up-voted answers, but accepting is a different action. For more information, please read How do you accept an answer?.
Jul
15
comment Handling a too big matrix equation
Your equation, even rotated, is too big (at least for the default settings on a4paper and book).
Jul
14
comment Is there any way to specify a “TO DO” in LaTeX?
To generate the requested warning you can use \usepackage{etoolbox} \makeatletter \pretocmd{\@todo}{\GenericWarning{}{There's sometthing to do here}}{}{} \makeatother