Abstract
Let E be an elliptic curve over a number field K which admits a cyclic p-isogeny with p ⩾ 3 and semistable at primes above p. We determine the root number and the parity of the p-Selmer rank for E / K , in particular confirming the parity conjecture for such curves. We prove the analogous results for p = 2 under the additional assumption that E is not supersingular at primes above 2.
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