The average 6-torsion

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• Peter Koymans (Utrecht University)
• Tuesday 10 February 2026, 14:30-15:30
• MR14.

If you have a question about this talk, please contact Tim Santens.

Cohen and Lenstra made influential conjectures regarding the average value of the n-torsion of class groups of quadratic fields. So far these conjectures have been proven only for a very select number of values of n, namely n = 2^k or n = 3. In this talk, we sketch how to obtain asymptotics for the average 6-torsion. This is joint work with Robert Lemke Oliver, Efthymios Sofos and Frank Thorne.

This talk is part of the Number Theory Seminar series.

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