Comment #1 on issue 2134 by renato.c...@gmail.com: Derivative of Lambda
does not work
http://code.google.com/p/sympy/issues/detail?id=2134
The error above doesn't show up anymore in master.
I'm not sure what Lambda(x, expr).diff(y) should be, because Lambda is not
an expression, but a function - sin.diff(x) raises an error. But maybe it
could simply mean Lambda(x, expr.diff(y)) (*if* x != y).
What Lambda certainly should implement if .fdiff().
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