It is a classical result (apparently due to Tate) that all elliptic curves with a torsion point of order n ð44n410; or n ¼ 12Þ lie in a one-parameter family. However, this fact does not appear to have been used ever for computing the torsion of an elliptic curve. We present here an extremely down-to
5-Torsion in the Shafarevich–Tate Group of a Family of Elliptic Curves
✍ Scribed by Cheryl DeLorme Beaver
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 192 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0022-314X
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✦ Synopsis
We compute the ,-Selmer group for a family of elliptic curves, where , is an isogeny of degree 5, then find a practical formula for the Cassels Tate pairing on the ,-Selmer groups and use it to show that a particular family of elliptic curves have non-trivial 5-torsion in their Shafarevich Tate group.
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