Comment #3 on issue 3618 by [email protected]: Assumptions on replacement symbols created by cse
http://code.google.com/p/sympy/issues/detail?id=3618
Good point. We might be able to fix that with issue 3613, though it would be messy.
Wouldn't it be the best to just make a separate NonCommutativeMul class, and make Symbol(commutative=False) just change the definition of __mul__ and __rmul__ (I guess the implementation will need to be a little more complicated than that, because you can have a commutative scalar part, but you get the idea: separate the classes)?
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