Title: Covering of 3manifold by Three open solid tori
Speaker: Dongxu Wang
Abstract: We consider the problem of obtaining a list of compact manifold that can be covered by a union of given sets. The classical Lusternik- Schnirelmann Category number for a manifold is generalized by the concept of A-category. As a first step, J.C Gomez, F. Gonzalez and Wolfgang Hei classified 3-manifolds that can be covered by 3 solid Tori.