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An isogeny is a surjection of algebraic groups that has a finite kernel. For abelian varieties, this is equivalently a rational map between groups of the same dimension that preserves the neutral element (which implies that it is a group homomorphism).
This Stack Exchange discussion, What is isogeny?
Wikipedia, Isogeny
Examples of sporadic (exceptional) isogenies from spin groups onto orthogonal groups are discussed in
Last revised on October 17, 2023 at 12:39:14. See the history of this page for a list of all contributions to it.