Generalizing results of Lemmermeyer, we show that the 2-ranks of the Tate Shafarevich groups of quadratic twists of certain elliptic curves with a rational point of order 2 can be arbitrarily large. We use only quadratic residue symbols in a quadratic field to obtain our results.
On the variation of Tate–Shafarevich groups of elliptic curves over hyperelliptic curves
✍ Scribed by Mihran Papikian
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 368 KB
- Volume
- 115
- Category
- Article
- ISSN
- 0022-314X
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✦ Synopsis
Let E be an elliptic curve over
] be an irreducible polynomial of odd degree, and let K =F ( √ d). Assume (p) remains prime in K. We prove the analogue of the formula of Gross for the special value L(E⊗ F K, 1). As a consequence, we obtain a formula for the order of the Tate-Shafarevich group I(E/K) when L(E⊗ F K, 1) = 0.
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