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Torsion points of elliptic curves over large algebraic extensions of finitely generated fields
Authors:Wulf-Dieter Geyer  Moshe Jarden
Institution:1. Mathematisches Institut, Universit?t Erlangen-Nürnberg, Bismarckstr. 1 1/2, 852, Erlangen, BRD
2. Department of Mathematics, Tel Aviv University Ramat Aviv, Tel Aviv, Israel
Abstract:The following Theorem is proved:Let K be a finitely generated field over its prime field. Then, for almost all e-tuples (σ)=(σ 1, …,σ e)of elements of the abstract Galois group G(K)of K we have:
  1. If e=1,then E tor(K(σ))is infinite. Morover, there exist infinitely many primes l such that E(K(σ))contains points of order l.
  2. If e≧2,then E tor(K(σ))is finite.
  3. If e≧1,then for every prime l, the group E(K(σ))contains only finitely many points of an l-power order.
HereK(σ) is the fixed field in the algebraic closureK ofK, ofσ 1, …,σ e, and “almost all” is meant in the sense of the Haar measure ofG(K).
Keywords:
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