Comment #14 on issue 2222 by lefschet...@gmail.com: Matrix([Matrix, ...])
should check the row length of empty matrices
http://code.google.com/p/sympy/issues/detail?id=2222
Interesting what google will come up with.
The mathematics treatment in comment #12 is correct. The fact that this
does not currently work out in SymPy makes it very hard to write code for
large parts of pure
mathematics, essentialy everything involving chain complexes (commutative
algebra, parts of algebraic geometry, group theory, algebraic topology,
with their applications to data mining etc.), where matrices of size [0,k]
and [l,0] occur all the time and have to be multiplied correctly.
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