A Local-global principle for isogenies of composite degree

preprint2022arXivOpen access

Abstract

Let EE be an elliptic curve over a number field KK. If for almost all primes of KK, the reduction of EE modulo that prime has rational cyclic isogeny of fixed degree, we can ask if this forces EE to have a cyclic isogeny of that degree over KK. Building upon the work of Sutherland, Anni, and Banwait-Cremona in the case of prime degree, we consider this question for cyclic isogenies of arbitrary degree.

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