> The problem with matrix(n,n,c) is that it's actually coming from matrix > rings! Scalars should probably coerce in there to make A - 1 work. It's > something supported on a level below. > > I don't understand this. I just traced matrix(2,2,x) and this is handled by _matrix_constructor. I don't see why matrix(2,2,x) needs to return a diagonal matrix. Could you please explain what you mean with "matrix(n,n,c) is coming from matrix rings"?
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