Stavros Macrakis <macrakis <at> alum.mit.edu> writes:
>
> Sorry, the second line should of course be
>
> df : diff( f, x )
>
functions is a way to avoid things like ev, at, subst and s.o.
I see a bug in this behaviour, because I found that
define(df(x),diff(f(x),x));
df(1); %, numer;
works fine...
Gru? HW