PAPER / ARXIV:2609.09509

Models of Elliptic Curves with Maximal 2-adic Image Subject to a Rational 2-Isogeny

Roberto Hernandez

RESUMO

Let $E$ be a non-CM elliptic curve defined over $\mathbb{Q}$. We present models of curves that have 2-adic image as large as possible, given the constraint that they have a rational 2-isogeny. These curves are known to be generic, and one of the aims of this article is to make that fact explicit. Our techniques make use of modular curves and their $j$-maps, as well as classification results on isogeny-graphs that have appeared in the literature recently.

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