> Having immutability by default would be particuarly annoying in the
> following case
>
> sage: a = identity_matrix(ZZ, 3)
> sage: b = a + a   # immutable
> sage: b[0,1] = 2  # niet

Why would identity_matrix return an immutable matrix ? Or did I miss
something ? All that we need is that the sum/product of immutable
matrices return an immutable matrix, and that does not seem in
conflict with your example.

Nathann

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