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Isogenies of prime degree over number fields

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Nicolas Billerey
U Duisburg-Essen
Wed, 2010-04-07 14:15 - 15:15
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Let K be a number field and E an elliptic curve defined over K. The so-called exceptional set for (E,K) consisting of prime numbers p such that E has a p-isogeny defined over K is finite iff E does not have CM over K. In this talk, I will state a criterion which allows, in various situations, to explicitly determine the exceptional set when it is finite.

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