The Selmer converse for elliptic curves at every prime
We prove the Selmer converse in coranks zero and one for every elliptic curve over ℚ and every prime p : if the full p -power Selmer group has ℤ p -corank $r\in\{0,1\}$, then the analytic and Mordell–Weil ranks both equal r , and the entire Tate–Shafarevich group is finite. As an application at the additive prime 3, we prove that for every prime $\ell\equiv4,7,8\pmod9$, the cubic $X^3+Y^3=\ell Z^3$ has analytic and Mordell–Weil rank one and finite Tate–Shafarevich group. In particular, every such ℓ is a sum of two rational cubes.
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