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An elliptic curve is an algebraic curve of genus one with some additional properties. Questions with this tag will often have the top-level tags nt.number-theory or ag.algebraic-geometry. Note also the tag arithmetic-geometry as well as some related tags such as rational-points, abelian-varieties, heights. Please do not use this tag for questions related to ellipses; instead use conic-sections.

3 votes

Example of a diophantine application of an open image theorem

Well, this isn't explicitly diophantine, but here goes: If $f$ is a level one weight $k$ eigenform with rational coefficients, the image of the attached Galois representation $\rho_f:G_{\mathbb{Q}} …
Kevin Ventullo's user avatar
3 votes

The significance of modularity for all Galois representations

Proving modularity of finite image Galois representations seems to be the most feasible way of proving the Artin conjecture. In fact, this was one of Langlands' original motivations.
Kevin Ventullo's user avatar
7 votes

Isogenous elliptic curve with integral j-invariant

This will never be the case. By the criterion of Neron-Ogg-Shafarevich, an elliptic curve has good reduction if and only if its $\ell$-adic Tate module is unramified for $\ell\neq p$, where $p$ is t …
Kevin Ventullo's user avatar