Comment #12 on issue 2696 by julien.r...@gmail.com: Assumptions fail for non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2696
Well, that's one example. It could also represent a differential operator. Anyway, I always took this real=True assumption to mean conjugate(x)==x and nothing else. I would be interested to know, where in the code does real imply commutative.
MatrixSymbol looks like a relatively recent addition. Maybe I ought to use that, as you say, but up to now I never needed anything else then Symbol. I can't seem to assume conjugate(x)==x when I use MatrixSymbol.
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