Am 20.03.2015 um 13:56 schrieb Sudhanshu Mishra:
I have a question.This one is fine. In [9]: x = Symbol('x', zero=True) In [10]: (x*y).is_zero ------------------------------ Here we didn't give facts about y then why ask returned True? In [3]: ask(Q.zero(x*y), Q.zero(x)) Out[3]: True
I'd assume that x*zero is always zero regardless of the value of x, so this result seems correct. This assumes that x is a number, of course. If we allow anything involving limits for x, then the result should not be True.
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