Local-global principle for isogenies of elliptic curves over quadratic fields
In this paper, we prove that the local-global principle of $11$-isogenies for elliptic curves over quadratic fields does not fail. This gives a positive answer to a conjecture by Banwait and Cremona. The proof is based on the determination of the set of quadratic points on the modular curve $X_{D_{10}}(11)$.
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Number Theory
Primary 14G05, 11G18, Secondary 11G05