All,
Try:
\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\label{func}
P_{r-j}=
\begin{cases}
0, & \text{if $r-j$ is odd}\\
r!(-1)^{(r-j)/2}, & \text{if $r-j$ is even.}
\end{cases}
\end{equation}
\end{document}
Then try:
\usemodule[amsl]
\starttext
\placeformula[func]
\startformula
P_{r-j}=
\startcases
0, & \text{if $r-j$ is odd}\\
r!(-1)^{(r-j)/2}, & \text{if $r-j$ is even.}
\stopcases
\stopformula
\stoptext
You'll note that the spacing in the latter is not as good.
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