Updates:
Summary: is_zero should default to None, not False
Comment #15 on issue 2052 by [email protected]: is_zero should default to
None, not False
http://code.google.com/p/sympy/issues/detail?id=2052
I agree it should default to None, rather than False. What are some good
ways to tell for sure that it is not zero (i.e., the False case)?
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