citingequations
Suppose I have an equation at some point in my document say
\begin{equation}
equation 1
\end{equation}
and latter in my document I reference the equation writing (1). Is there a way to reference this equation so that if I add a new equation before it my reference will automatically update to (2)?
You shouldn't add the references inside the equation IMO, but outside as in this code:
% arara: pdflatex: {synctex: yes}
% arara: biber
% arara: pdflatex: {synctex: yes}
% arara: pdflatex: {synctex: yes}
%
\documentclass{article}
\usepackage{filecontents}
\usepackage[backend=biber]{biblatex}
\addbibresource{biblatex-examples.bib}
\begin{document}
From the famous inequality math relation~\cite{companion}
\begin{equation}
y \neq x
\end{equation}
%
Or you can also say:
\begin{equation}
y \neq x
\end{equation}
as proved by~\cite{companion}
\printbibliography
\end{document}
Thus leaving equations to themselves. This reduces the confusion between the parameters and the citation number. (Equations are equations - Don't put something else inside :-))
Since you want a cheat sheet, I'd recommend the extract package. With a slightly different MWE:
\documentclass{article}
\usepackage[
active,
header=false,
copydocumentclass=true,
generate=\jobname-Cheatsheet,
extract-env={equation},
extract-cmdline={synopsis},
]{extract} % http://ctan.org/pkg/extract
\begin{extract*}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
\end{extract*}
\begin{extract}
% Items executed only in extracted document
\def\synopsis#1{#1}
\end{extract}
\def\synopsis#1{}
\begin{document}
First Euler observed that
\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%
\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}
Then, Gauss discovered the normal distribution:
\synopsis{Normal distribution}%
\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}
Finally, Einstein proclaimed:
\synopsis{Equivalence of mass and energy}%
\begin{equation}
E = m C^2
\end{equation}
\end{document}
you get an original document of:
and an extracted document of:
\documentclass{article}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
% Items executed only in extracted document
\def\synopsis#1{#1}
\begin{document}
\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%
\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}
\synopsis{Normal distribution}%
\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}
\synopsis{Equivalence of mass and energy}%
\begin{equation}
E = m C^2
\end{equation}
\end{document}
and:
This also works with your original \caption command.
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