sympy/sympy — pull request #1670 by rlamy (2012-11-23 20:01:52+00:00)
Title: Remove auto-evaluation in MatrixExpr

After the lengthy discussions surrounding `sympy.rules` and `sympy.unify`, I've come to the conclusion that the only clean way for them to work is to avoid any form of auto-evaluation in their constructors.

For now, I've only dealt with Adjoint and Transpose. The rest will follow.

NB: this depends on #1667.