Seminar series
Date
Tue, 09 Feb 2016
Time
14:00 -
15:00
Location
L4
Speaker
Richard Thomas
Organisation
Imperial College London
I will describe 5 definitions of Euler characteristic for a space with perfect obstruction theory (i.e. a well-behaved moduli space), and their inter-relations. This is joint work with Yunfeng Jiang. Then I will describe work of Yuuji Tanaka on how to this can be used to give two possible definitions of Vafa-Witten invariants of projective surfaces in the stable=semistable case.