The ι-adic and p-adic Representations of Deuring
Part of the Graduate Texts in Mathematics book series (GTM, volume 112)
It was first proved by Hasse that even in characteristic p > 0, if N is an integer prime to p, then the points of order N on an elliptic curve A form a cyclic group of type Z/NZ x Z/NZ.
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© Springer-Verlag New York Inc. 1987