Mathematics – Number Theory
Scientific paper
2008-12-31
Journal de Th\'eorie des Nombres de Bordeaux 22 (2010), 353-358
Mathematics
Number Theory
6 pages, to appear in Journal de Th\'eorie des Nombres de Bordeaux
Scientific paper
A well known theorem of Mestre and Schoof implies that the order of an
elliptic curve E over a prime field F_q can be uniquely determined by computing
the orders of a few points on E and its quadratic twist, provided that q > 229.
We extend this result to all finite fields with q > 49, and all prime fields
with q > 29.
Cremona John E.
Sutherland Andrew V.
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