Comment #12 on issue 2020 by jensen.oyvind: Symbols & Matrices
http://code.google.com/p/sympy/issues/detail?id=2020
About "a - sympy.Matrix(...)":
It would be a well defined operation if the Indexed framework got support
for broadcasting. I think it would be cool to implement exactly the same
broadcasting rules as Numpy, so that Indexed can be used to work
symbolically with Numpy array expressions.
About the substitution:
Once the broadcasting rules are implemented, the resulting expression will
be well defined, so then it would make sense to support it.
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