Comment #15 on issue 2039 by asmeurer: Mul.eval_subs problems http://code.google.com/p/sympy/issues/detail?id=2039
sqrt(A) doesn't even make sense for non-commutative (at least in the general case). Maybe someone who knows more about group theory could come up with a better answer, but I am tempted to say that that one should not even work.
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