Speakers: Dr. Mikhail Malakhaltsev, and Dr. Fabian Antonio Arias Amaya, Universidad de los Andes, Colombia
Abstract: A principal G-bundle with singularities is a principal bundle P-M with structure group G', which reduces to the subgroup G of G' outside a submanifold S of the base manifold M. The aim of this talk is to give some examples of G-structures with singularities and explain how construct topological and differential invariants of such structures.