Another example, still in the homset context, is isomorphisms. They typically require a specific method, __invert__(), which has no meaning for generic homset elements. So, what is the general policy regarding the treatment of isomorphisms in Sage ? For automorphisms, things are different, because one may implement a specific parent for them (e.g. the general linear group for module automorphisms). One has also to implenent some coercion between this specific parent and the parent of generic morphisms.
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