Intercity Seminar 2026

The organisers of the seminar are:
- Carel Faber, Universiteit Utrecht;
- Luca Giovenzana, University of Antwerp;
- Zhelun Chen, Leiden University.

Program:

Program available here!

The main reference is the preprint of Philip Engel, Olivier de Gaay Fortman and Stefan Schreieder Matroids and the integral Hodge Conjecture for Abelian Varieties.

Meetings:

We plan to have 4 meetings on 4 Fridays. Talks schedule might slightly change from day to day, see the program below for more info.

27th February, University of Antwerp;
27th March, Leiden University;
24 April 17th April, Utrecht University;
5th June, Radboud University, Nijmegen (To Be Confirmed).

27th February- Antwerp

All talks will take place in the Stadscampus S.C.002, around 15 minutes on foot from Antwerpen Centraal. Here is a map. The building can be accessed via Prinsstraat

13:00-14:00 Overview of the paper;
14:00-14:30 CoffeBreak;
14:30-15:45 Introduction to matroids;
16:15-17:30 Hodge Theory of Abelian Varieties.

27th March - Leiden
All talks will take place in the room BE.0.08 in the Gorlaeus Building

13:15 - 14:30 (tropical) theta-functions, A_g and its compactifications
15:00 - 16:15 At the core of Mumford Construction: Examples
16:30 - 17:45 From a Matroid to a degeneration and back

24th April 17th April- Utrecht
All talks will take place in the lecture hall Pangea in the Koningsberger (KBG) building

13:00-14:15 (Olivier de Gaay Fortman) The resolution of the base change.
14:45-16:00 (Philip Engel) From algebraicity to quadratic splittings of matroids.
16:15-17:30 (Wouter Fransen) Matroids arising from families of Prym varieties.

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