English

On the Lambda-cotorsion subgroup of the Selmer group

Number Theory 2020-10-13 v3

Abstract

Let EE be an elliptic curve defined over a number field KK with supersingular reduction at all primes of KK above pp. If K/KK_{\infty}/K is a Zp\mathbb{Z}_p-extension such that E(K)[p]E(K_{\infty})[p^{\infty}] is finite and H2(GS(K),E[p])=0H^2(G_S(K_{\infty}), E[p^{\infty}])=0, then we prove that the Λ\Lambda-torsion subgroup of the Pontryagin dual of Selp(E/K)\text{Sel}_{p^{\infty}}(E/K_{\infty}) is pseudo-isomorphic to the Pontryagin dual of the fine Selmer group of EE over KK_{\infty}. This is the Galois-cohomological analog of a flat-cohomological result of Wingberg.

Keywords

Cite

@article{arxiv.1812.00207,
  title  = {On the Lambda-cotorsion subgroup of the Selmer group},
  author = {Ahmed Matar},
  journal= {arXiv preprint arXiv:1812.00207},
  year   = {2020}
}

Comments

made a slight change to the introduction

R2 v1 2026-06-23T06:27:53.701Z