sympy/sympy — pull request #1412 by mrocklin (2012-07-12 16:38:19+00:00)
Title: Distributed transpose logic

Distributed logic of sympy.matrices.expressions.transpose.Transpose.

I.e. before the Transpose constructor knew that `(X + Y).T == X.T + Y.T` .
Now the MatAdd._eval_transpose() method knows this