Comment #5 on issue 3226 by asmeu...@gmail.com: high-order derivatives should be cse-simplified
http://code.google.com/p/sympy/issues/detail?id=3226
I'm curious how csesimp() actually simplifies the expression. Are things just canceling in intermediate steps? Or does cse() do some simplification?
It seems like a true csesimp() would actually call simplify() on e[0] and [i[1] for i in r]. It is a clever way of getting around some of the limitations in simplify(), though.
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