Re: Efficient way to store an isomorphism?

This is only a commentary, and this requires a little algebra to be
understood.
If you are working with finite sets you can store the image of the
generators of some subgroups of A (I am supposing that you are working
with groups), and then, if required, reconstruct the image of the other
elements, exploiting the fact that you have an isomorphism (actually,
this also works for a morphism).

Good luck

.

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