Navinraj schrieb:
> It is working, but when I am using
> \usepackage{amsmath} \cases is not working. Is there
> any other way to make both work?
amsmath has an own environment cases. Choose this one.
f.ex.:
\[
f(x)=\begin{cases}
7 & \text{for } x\le 3\\
x^2-4 & \text{for } x>3
\end{cases}
\]
Herbert