Comment #7 on issue 2020 by [email protected]: Symbols & Matrices
http://code.google.com/p/sympy/issues/detail?id=2020

I like the idea of adapting the Indexed class. Is there any description available what Indexed should be used for? Is the interaction with Matrix and Symbol a part of it?

To make it work properly, one might have to add the shape attribute eventually, since things like

A = Indexed('A', shape=(2,3))
B = Indexed('B', shape=(2,3))
s = (A+B).shape

should work which requires Add to return a shape. Is there a better alternative?

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