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The Quarterly Journal of Mathematics Advance Access published online on February 1, 2009

The Quarterly Journal of Mathematics, doi:10.1093/qmath/hap001
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© 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

TATE–SHAFAREVICH GROUPS AND FROBENIUS FIELDS OF REDUCTIONS OF ELLIPTIC CURVES

Igor E. Shparlinski{dagger}

Department of Computing, Macquarie University, Sydney, NSW 2109, Australia

{dagger} E-mail: igor{at}ics.mq.edu.au

Received 16 September 2008; Accepted for publication 5 January 2009.


   Abstract

Let E/Q be a fixed elliptic curve over Q which does not have complex multiplication. Assuming the Generalized Riemann Hypothesis, Cojocaru and Duke have obtained an asymptotic formula for the number of primes p≤x such that the reduction of E modulo p has a trivial Tate–Shafarevich group. Recent results of Cojocaru and David lead to a better error term. We introduce a new argument in the scheme of the proof, which gives a further improvement.


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