Vafa-Witten Invariants of Projective Surfaces 1/5
This course has 4 sections split over 5 lectures. The first section will be the longest, and hopefully useful for the other courses.
Sheaves, moduli and virtual cycles Vafa-Witten invariants: stable and semistable cases Techniques for calculation --- virtual degeneracy loci, cosection localisation and a vanishing theorem Refined Vafa-Witten invariants