This might be more of a typography question.
Say have two equations, and I put them in an aligned environment.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
The following equations are true:
\begin{align*}
a^2 + b^2 & = c^2 \\
x^2 + y^2 & = z^2.
\end{align*}
\end{document}
Do I need to add a semicolon or a comma after c^2? I know that in the case of a cases environment it is recommended to do so.
Best Answer
Short answer: add punctuation after your
c^2.Long answer:
In general maths is punctuated just as normal text is. The following is a short extract from a document I've been preparing for many years, eventually to be submitted to TUG.
It is called Mathematics with Style and deals in general terms the accepted typeset appearance of mathematics, but not as a "How to do it with (La)TeX".