Comment #4 on issue 3991 by [email protected]: Conjugate transpose of
scalar exponential treated like matrix
http://code.google.com/p/sympy/issues/detail?id=3991
1) Add and Mul should probably be able to give better results for
the .is_complex assumption. transpose() still works on Add and Mul, though,
because these classes explicitly redefine _eval_transpose() instead of
relying on Expr._eval_transpose().
2) I think it is fair to say that Function defines scalar functions. One
could imagine such a thing like a MatrixFunction: if it existed we should
set .is_complex to False on such an object.
The trace function is a bit different, because if you pass it a
MatrixSymbol, it returns an instance of the Trace class instead of an
instance of the Function class. So it's not affected by the PR. We could
probably set .is_complex to True on the Trace class, except when it
represents a partial trace.
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