When I have equations, as in
\begin{equation} ... \end{equation}
Can I arbitrarily assign the numbers to the equations? Instead of the usual order (1), (2), (3), ..., I'd like something like (1), (2.1), (2.2), (2.3), (3.1), (3.2), (4), ...
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2Is there some logic behind the numbering, or is it purely arbitrary?– Werner ♦Feb 8, 2013 at 3:56
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@Werner Thanks for your question. They are the equations under Theorem 1, Theorem 2, and so on. Is there a convenient way to do the numbering?– Paul S.Feb 8, 2013 at 4:06
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1 Answer
Yes, absolutely, using the amsmath package and its \tag command.
A little example
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
y=mx+b\tag{1.2}
\end{equation}
or
\begin{equation}
y=mx+b\tag{duck}
\end{equation}
\end{document}
After reading your comment, if you want the equation number to inherit the theorem number, then you can use, for example,
\newtheorem{mytheorem}{Theorem}
\numberwithin{equation}{mytheorem}
and then you don't have to tag equations manually.
