A note on the Mordell-Weil rank modulo n

Details A note on the Mordell-Weil rank modulo n A note on the Mordell-Weil rank modulo n

2009-10-23

arxiv.org/abs/0910.4588v1

Mathematics

Number Theory

7 pages

Scientific paper

Conjecturally, the parity of the Mordell-Weil rank of an elliptic curve over a number field K is determined by its root number. The root number is a product of local root numbers, so the rank modulo 2 is conjecturally the sum over all places of K of a function of elliptic curves over local fields. This note shows that there can be no analogue for the rank modulo 3, 4 or 5, or for the rank itself. In fact, standard conjectures for elliptic curves imply that there is no analogue modulo n for any n>2, so this is purely a parity phenomenon.

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