Comment #5 on issue 2696 by ronan.l...@gmail.com: Assumptions fail for non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2696
The problem is that 'commutative' is special-cased in Symbol, which prevents it from being handled correctly by the assumption system (this was briefly discussed in issue 2446). I think that the solution is to remove this special-casing.
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