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September 20, 2025Journal de Théorie des Nombres de BordeauxOpen Access

Explicit 7-torsion in the Tate–Shafarevich groups of genus 2 Jacobians

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Authors

SFSam Frengley

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Overview

An algorithm reveals non-trivial order 7 elements in Tate–Shafarevich groups of genus 2 jacobians, indicating unique elliptic curve relationships.

Key Points

  • Non-trivial elements of order 7 exist in the Tate–Shafarevich groups of some genus 2 jacobians, indicating unique properties.
  • The algorithm generates twists of the Klein quartic curve related to genus 2 jacobians, revealing remarkable Galois representations.
  • Genus 2 curves with small conductor from Bending and Elkies–Kumar families demonstrate interesting order 7 torsion.
  • An abelian three-fold reveals the visibility of these non-trivial order 7 group elements, enhancing understanding of elliptic curves.

Cite This Study

Sam Frengley (2025) studied this question.

synapsesocial.com/papers/68d469ce31b076d99fa66c4fhttps://doi.org/10.5802/jtnb.1340
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