I'd like to get exactly the output generated by
\begin{gather}
\left\{
\begin{aligned}
a &= b,\\ c & = d.
\end{aligned}
\right.
\end{gather}
except that I'd like separate numbers for each of the two equations. How do I achieve this?
(edit: in response to comments)
Numcases does what I want, thank you all for your help! The surprising thing is that numcases does what I want it to do, but it is a poor substitute for the cases environment. Just compile the document below and look at the symbol sizes and spacing! In other words, the answer in the linked post answers my question, but not the question in the linked post!
\documentclass[12pt,reqno]{amsart}
\usepackage{cases}
\begin{document}
\begin{gather}
\left\{
\begin{aligned}
\frac{a}{b} &= b,\\ c & = d.
\end{aligned}
\right.
\end{gather}
\begin{numcases}{}
\frac{a}{b} = b,\\ c = d.
\end{numcases}
\begin{gather}
\begin{cases}
\frac{a}{b} = b,\\ c = d.
\end{cases}
\end{gather}
\end{document}
