Comment #1 on issue 2222 by [email protected]: Matrix([Matrix, ...]) should check the row length of empty matrices
http://code.google.com/p/sympy/issues/detail?id=2222
Personally for me all matrices with zero let's say rows are the same regardless the number of columns, thus an above example should either ignore empty building blocks (like in sum: a + b + 0 = a + b) or raise an exception (like in product: a * b * 0 = 0). The choice is just a matter of personal taste (I'd prefer first option).
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