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I have a TikZ figure whose code I don't want to modify. I want some parts of this figure not to be displayed. So, I add a clipping code at the beginning. However, the texts in the clipped sections are still visible in the produced PDF if selected by mouse.

Consider the following minimal code ...

Thanks for the answer.

I want to overload a definition with three variations using arguments in parenthesis. Something like the non-working code below:
\documentclass{article}

\def\f{F}
\def\f(#1){F(#1)}
\def\f(#1,#2){F_{#1}^{#2}}

\begin{document}

$\f$
$\f(1)$
$\f(1,2)$

\end{document}
Any ideas on how to do such a ...

Are there any means to write appendices in the middle of the document, yet they will be appended at the end of document?

What I want to achieve is something like this:


\documentclass{article}
\begin{document}

\section{Section A}
See Appendix A.

\begin{appendix} %%%
\section{Appendix A ...

I want to produce a document consisting of a single tikZ figure.

\documentclass{article}
\usepackage{tikz}
\begin{document}
\pagestyle{empty}
\centering
\begin{tikzpicture}
\draw (0,0) arc (0:360:3cm);
\draw (0,0) arc (0:360:2cm);
\draw (-2,0) arc (0:360:2cm);
\draw (-1,-1) arc (0:360:2cm);
\draw ...

Stefan's solution works well. Thanks a lot.

Consider the the following expression:


\begin{equation}
A = \left( \sum_{\substack{i<B\\i<C\\i<D}}{i} \right)
\end{equation}


When latex renders it, there is significant empty space above the sigma sum that is covered by the parentheses. Any ideas on how to reduce the vertical size of the ...

That did the trick. Thanks Stefan, both for the welcome and the answer.

I want to write a multi-lined equation where the lines are aligned to the equal sign on the first line. I can do this with align*, for example:
\begin{align*}
a = & b + c + \\
& d + e
\end{align*}
Yielding to
a = b + c +
d + e
However, the result is horizontally centered on the page. I want the ...