General Mathematics Colloquium

This colloquium takes place every other Wednesday afternoon, 16:00-17:00, in room WN-M143 . For more information, please contact one of the organizers Joost Hulshof and Dennis Dobler.

A database of earlier years' talks can be found here.

Upcoming talks in 2018:


Wed 21 Februari: Gijs Heuts (UU), Room WN-M143, 16:00-17:00

Title: Lie algebras and periodicity in homotopy theory

Abstract: Homotopy theory is the study of continuous deformations of spaces. The general problem of classifying such deformations is notoriously hard. However, if one is only interested in rational invariants of spaces then there are good algebraic tools available: Quillen constructed for every space a Lie algebra from which such invariants can be calculated, whereas Sullivan built a commutative algebra (much like the algebra of differential forms on a manifold) that retains essentially the same information. I will discuss a modern viewpoint of homotopy theory called the "chromatic perspective": much like a ray of white light is broken into different colours through a prism, a space can be decomposed into pieces corresponding to various "frequencies". The rational invariants correspond to one of these pieces. It turns out that Lie algebras may also be used to give models for the others.

 

Wed 07 Maart: Nelly Litvak, Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 21 Maart: Peter Grunwald (CWI, Leiden), Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 04 April: geen colloquium

Wed 18 April: Sjoerd Verduyn Lunel (UU), Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 02 Mei: TBA, Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 16 Mei: Viresh Patel (UvA), Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 30 Mei: TBA, Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA

Wed 13 Juni: TBA, Room WN-M143, 16:00-17:00
Title: TBA
Abstract: TBA


Previous talks in 2018:


Wed 07 Februari: Damaris Schindler (UU), Room WN-M143, 16:00-17:00

Title:Systems of quadratic forms

Abstract: In this talk we discuss some aspects concerning the arithmetic of systems of quadratic forms. Our focus will be on the local-global principle for the existence of rational or integral solutions and we will discuss some failures of this principle.