Dual Isogeny

Some articles on dual isogeny, isogeny:

Dual Abelian Variety - Construction of The Dual Isogeny
... Often only the existence of a dual isogeny is needed, but it can be explicitly given as the composition where is the group of divisors of degree 0 ... by To see that, note that the original isogeny can be written as a composite and that since is finite of degree, is multiplication by on Alternatively, we can use the ...

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