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Autumn Semester 2026

Date / Time Speaker Title Location
24 August 2026
11:15-12:15 		Dr. Eric Ahlqvist
University of Stockholm
Details

Number Theory Seminar

Title Schur $\sigma$-groups of type $(3,3)$
Speaker, Affiliation Dr. Eric Ahlqvist, University of Stockholm
Date, Time 24 August 2026, 11:15-12:15
Location HG G 43
Abstract Fix an odd prime $p$. For any imaginary quadratic field $K$, the Galois group $G_K$ of its maximal unramified pro-$p$-extension is a Schur $\sigma$-group. If the minimal number of generators of $G_K$ is at least two, then work of Golod–Shafarevich and many others implies that $G_K$ is infinite unless it has Zassenhaus type $(3,3)$, $(3,5)$, or $(3,7)$. In these three remaining cases, there is no characterization of the pairs $(K,p)$ for which $G_K$ is finite. In most cases when the Zassenhaus type is $(3,3)$, we already know that $G_K$ is $p$-adic analytic and should therefore be finite according to the Fontaine-Mazur conjecture. Regardless of that, it is an interesting problem to classify all Schur $\sigma$-groups of type $(3,3)$. In this talk, I will present recent and ongoing joint work with Richard Pink towards such a classification.
Schur $\sigma$-groups of type $(3,3)$read_more
HG G 43
9 October 2026
14:15-15:15 		Prof. Dr. Johannes Sprang
Duisburg-Essen
Details

Number Theory Seminar

Title Title TBA: Johannes Sprang
Speaker, Affiliation Prof. Dr. Johannes Sprang, Duisburg-Essen
Date, Time 9 October 2026, 14:15-15:15
Location HG G 43
Title TBA: Johannes Sprang
HG G 43
16 October 2026
14:15-15:15 		Dr. Romain Branchereau
MPIM, Bonn
Details

Number Theory Seminar

Title Title TBA: Romain Branchereau
Speaker, Affiliation Dr. Romain Branchereau, MPIM, Bonn
Date, Time 16 October 2026, 14:15-15:15
Location HG G 43
Title TBA: Romain Branchereau
HG G 43
30 October 2026
Details

Number Theory Seminar

Title Arithmetica Transalpina
Speaker, Affiliation
Date, Time 30 October 2026,
Location
Arithmetica Transalpina
6 November 2026
14:15-15:15 		Dr. Eric Yen-Yo Chen
EPFL
Details

Number Theory Seminar

Title Title TBA: Eric Yen-Yo Chen
Speaker, Affiliation Dr. Eric Yen-Yo Chen, EPFL
Date, Time 6 November 2026, 14:15-15:15
Location HG G 43
Title TBA: Eric Yen-Yo Chen
HG G 43
13 November 2026
14:15-15:15 		Dr. Lennart Gehrmann
Universität Bielefeld
Details

Number Theory Seminar

Title Title TBA: Lennart Gehrmann
Speaker, Affiliation Dr. Lennart Gehrmann, Universität Bielefeld
Date, Time 13 November 2026, 14:15-15:15
Location HG G 43
Title TBA: Lennart Gehrmann
HG G 43
4 December 2026
Details

Number Theory Seminar

Title Swiss Number Theory Days
Speaker, Affiliation
Date, Time 4 December 2026,
Location
Swiss Number Theory Days
11 December 2026
14:15-15:15 		Prof. Dr. François Loeser
IMJ-PRG
Details

Number Theory Seminar

Title Title TBA: François Loeser
Speaker, Affiliation Prof. Dr. François Loeser, IMJ-PRG
Date, Time 11 December 2026, 14:15-15:15
Location HG G 43
Title TBA: François Loeser
HG G 43

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