Updates:
        Status: Fixed
        Labels: -NeedsBetterPatch -WrongResult

Comment #11 on issue 1560 by ronan.l...@gmail.com: -2**-2 gives -1/4;  
should give 1/4
http://code.google.com/p/sympy/issues/detail?id=1560

This has been fixed, and the tests got in as well. Apparently with this  
commit (see
issue 1358):

commit 4e5195d303eca6997c77b57144ee45829b70a2ba
Auteur :        Bill Flynn <wfly...@gmail.com>  sam. août 22 19:55:47 2009
Commiteur :     Ondrej Certik <ond...@certik.cz>  sam. août 22 20:39:17 2009

Fixes Mul's substitution

Lots of tests written. Previously it was essentially broken, now it works  
both
for commutative and noncommutative symbols

Signed-off-by: Ondrej Certik <ond...@certik.cz>

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