Updates:
Blockedon: -sympy:2196 sympy:2196
Comment #2 on issue 2877 by [email protected]: Contradictory facts
about infinities in the new assumptions
http://code.google.com/p/sympy/issues/detail?id=2877
The old system is susceptible to similar problems. For example, just add
the following rules to the gamma function:
def _eval_is_positive(self):
return True
def _eval_is_negative(self):
return True
gamma(x).is_posiitve
True
gamma(x).is_negative
False
*new session*
gamma(x).is_negative
True
gamma(x).is_positive
False
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