Updates:
        Status: WontFix

Comment #13 on issue 420 by [email protected]: matrix: why Matrix is not a subclass of Symbol - m + x should work
http://code.google.com/p/sympy/issues/detail?id=420

Recently matrices module got expressions submodule, so now the following:

In [1]: A = MatrixSymbol('A', 5, 5)

In [2]: 2*A + A**2 + A
Out[2]:
       2
3⋅A + A

In [3]: _.shape
Out[3]: (5, 5)

is possible. I consider this issue as not valid anymore. Instead of using plain symbols that don't have shape, one should use MatrixSymbol (as in the example).

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