Comment #12 on issue 2106 by Vinzent.Steinberg: Matrix of shape (1,1) and a number can't be added
http://code.google.com/p/sympy/issues/detail?id=2106
Well, you could define the addition componentwise, this makes sense. And this is what numpy/mpmath are doing.
I thinks it's fine to let the user do the 1x1-matrix <-> scalar conversion explicitly. (It's different from a scalar, you could also have an 1x1x1-object for instance.)
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