【摘 要】
：
We obtain a function field version of Birchs Lemma, which reveals non-torsion points in quadratic twists of an elliptic curve over a global function field, where the quadratic twists have many prime f
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We obtain a function field version of Birchs Lemma, which reveals non-torsion points in quadratic twists of an elliptic curve over a global function field, where the quadratic twists have many prime factors. The proof is based on Browns Euler system for Heegner points of function fields and Vignis result.
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