Updates:
Labels: NeedsReview smichr
Comment #2 on issue 3393 by smi...@gmail.com: Equals passing None to Evalf
/ Evalf errors
http://code.google.com/p/sympy/issues/detail?id=3393
equals tries randomly evaluating the expression. Without a good way to know
the domain in which to guess, sometimes it guesses in an invalid domain for
which evalf fails. In this case, when a negative value for n is chosen,
evalf fails. A hack is to watch for this in _random and just bail when this
happens.
https://github.com/sympy/sympy/pull/1540
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