Richard Thomas - Vafa-Witten Invariants of Projective Surfaces 4/5
Channel: Institut des Hautes Études Scientifiques (IHÉS)
Date: 2021-07-08

This course has 4 sections split over 5 lectures. The first section will be the longest, and hopefully useful for the other courses.

 1. Sheaves, moduli and virtual cycles
 2. Vafa-Witten invariants: stable and semistable cases
 3. Techniques for calculation --- virtual degeneracy loci, cosection localisation and a vanishing theorem
 4. Refined Vafa-Witten invariants