Comment #10 on issue 3814 by [email protected]: Relations on MatrixElements are broken.
http://code.google.com/p/sympy/issues/detail?id=3814

https://github.com/sympy/sympy/pull/2095

Part of the introduction:

"MatrixExprs make different assumptions about their trees than Exprs. They are both more and less strict in different ways."

I actually find value in the differences between MatrixExprs and Exprs. I think it has been an interesting experiment. The unfortunate side-effect is that classes that span the two like MatrixElement cause rough connection points.

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