January 2018 February 2018 |

4:00 pm Monday, February 19, 2018 Topology Seminar: Homomorphisms of pure mapping class groups to the integersby Priyam Patel (UCSB) in HBH 427- A classical theorem of Powell (with roots in the work of Mazur and Birman) states that the pure mapping class group of a connected, orientable, finite-type surface of genus at least 3 is perfect, that is, it has trivial abelianization. We will discuss how this fails for infinite-genus surfaces and give a complete characterization of all homomorphisms from pure mapping class groups of infinite-genus surfaces to the integers. This is joint work with Javier Aramayona and Nicholas Vlamis.
Submitted by neil.fullarton@rice.edu |