amsl: startcases/stopcases

[David Munger <mungerd@users.sourceforge.net>]

Hello Giuseppe,


I'm having a little trouble with the cases in amsl.

Compiling this:

\[
  f(x) =
  \startcases
    0        & \text{if $x < -\epsilon$} \\
    \frac12  & \text{if $x >  \epsilon$}
  \stopcases
\]

results in an error around the \frac. Changing it to \dfrac makes the  
input compile ok, but typesets the cases in an ugly manner with really  
narrow spacing.

Is there some way of telling startcases/stopcases to behave in display  
mode?

Thanks in advance,


David