isogeny noun2 •The condition of being isogenous. •An epimorphism of group schemes that is surjective and has a finite kernel.Lemma 2.2 Let E be an elliptic curve such that Z [π] is maximal at 𝓁. If there exists an 𝓁-isogeny of E, then this 𝓁-isogeny is an horizontal 𝓁-isogeny. — 2002 formsisogenies
