Interactions between symplectic geometry, combinatorics and number theory (14722.0068)


The "ColMar" Interactions




The seminar "Interactions" joins the teams of two universities: that of Cologne, and that of Marburg, therefore the name "ColMar* Interactions". The goal is to explain some very recent developments in the field of equivariant topology and equivariant symplectic geometry.

The organisers are:

Oliver Goertsches (

Panagiotis Konstantis (

myself (

This semester the seminar is organised by the University of Marburg only. Here you can find the link to the seminar website for this semester:

Below you can find some of the previous talks:

21.10.21, 14:30-16:00: Nicholas Lindsay (U. of Cologne), "Hamiltonian S^1-actions on complete intersections"

17.11.21, 12:30-14:00: Anton Ayzenberg (HSE University), "Face posets of equivariantly formal torus actions"

09.12.21, 14:30-16:00: Chris McDaniel (Endicott College), "A GKM Description for the Equivariant Coinvariant Ring of a Pseudo Reflection Group"

16.12.21, 14:30-16:00: Lisa Jeffrey (U. of Toronto), "Poisson maps between character varieties: gluing and capping"

Please note that the time zone above is GMT+1  

* It is also worth noticing that in Italian "colmare" means "to bridge", and we like bridges, because they allow interactions...


Link to our seminar in the past year: