Comment #8 on issue 2848 by [email protected]: Failing test in
sympy/solvers/test/test_solvers.py
http://code.google.com/p/sympy/issues/detail?id=2848
Actually, you don't need to restart the session, clearing the cache is
enough, fortunately.
After some single-stepping in WinPdb, I've narrowed it down further again
to:
clear_cache()
simplify(I*pi)
I*pi
(pi*I).is_positive
True
But note that even in that case,
(I*pi).is_positive
False
and yet,
pi*I == I*pi
True
This explains why the wrong assumptions propagate only some times - it
depends on whether I*pi or pi*I is used (evaluating log(-2) uses pi*I).
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