Hi Alex!

On 17 Nov., 22:12, Alex Ghitza <[email protected]> wrote:
...
> I'm not sure I understand this paragraph.  Mathematically, 0*M is
> always the zero matrix and never the number 0.  So it seems to me that
> maple screws up if it returns the number 0.  

I don't know whether maple returns the number 0. But even in Sage,
although 0*M is a matrix and not a number, this matrix is equal to the
number 0:

sage: M = Matrix([[1,2],[3,4]])
sage: 0*M==0
True
sage: type(0*M)
<type 'sage.matrix.matrix_integer_dense.Matrix_integer_dense'>


Cheers,
Simon

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