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ISOGENY
Etymology
Noun
isogeny (countable and uncountable, plural isogenies)
The condition of being isogenous.
(algebraic geometry, category theory) An epimorphism of group schemes that is surjective and has a finite kernel.
,
so that is in turn the dual isogeny of its dual . Isogeny of complex tori, rather than isomorphism, will turn out to be the appropriate equivalence relation in the context of modular forms.
Usage notes
In some contexts, (e.g, universal algebra), an epimorphism may be defined as a surjective homomorphism, and the definition of isogeny may change accordingly. In the broader context of category theory, however, this substitution is not made, because the definitions are not precisely identical. (A surjective homomorphism is always an epimorphism, but the reverse is not always true. See )
Source: Wiktionary
Recent Word Finds
Word of the Day
31 March 2025
IMPROVISED
(adjective) done or made using whatever is available; “crossed the river on improvised bridges”; “the survivors used jury-rigged fishing gear”; “the rock served as a makeshift hammer”
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