> sage: m = matrix(ZZ,2,[1,2,3,4])
> sage: d = m.det(); d
> -2
> sage: d.__init__(389)
> sage: m

> [1 2]
> [3 4]
> sage: m.det()
> 389

This problem would not occur if m.det() were to return a copy
of the cached determinant of m.

Michel






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