Updates:
Labels: -NeedsReview PassedReview
Comment #6 on issue 1735 by ondrej.certik: Use expr.func to get the head of
expressions.
http://code.google.com/p/sympy/issues/detail?id=1735
I am +0 on both patches (e.g. one argument for isinstance() is that it is
easy for
the new user to use it, since it's pythonic, while .func is sympy specific).
But if this makes things easier for you (or some other patches), let's put
it in. I
don't have an opinion on "==" vs "is".
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