Hey all,
   We ended up needing to compute the determinant of a 0x0 matrix in 
#17030.Sage currently says the following:

sage: mat = matrix(ZZ, 0, 0)
sage: mat.det()
1

However, the code (and myself) was expecting this to be 0 as the sum in the 
definition is vacuous.

Although, in a sense, the 0x0 matrix is its own inverse, so this might be an 
argument for having it be 1.

Thoughts?

Best,
Travis

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