Mdtop October 2019

mdtop@mathdept.okstate.edu

1 participants
2 discussions

Today in Topology Semianr
by Hoffman, Neil 15 Oct '19

15 Oct '19

I am speaking. My title and abstract are below: Title: Three sphere recognition modulo GRH Speaker: Neil Hoffman Date: Oct 15, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: In this largely expository talk, I will discuss the interplay between the Generalized Riemann Hypothesis and the problem of producing a relatively small sized certificate that a 3-manifold is not the three sphere. ______________________ Neil R. Hoffman Assistant Professor Department of Mathematics 523 Math Science Building Oklahoma State University Stillwater, OK 74078-1058 405-744-7791 http://math.okstate.edu/people/nhoffman

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Today in Seminar
by Hoffman, Neil 08 Oct '19

08 Oct '19

We have Andrew Yarmola visiting. His title and abstract are below. See you there. Title: Volumes and filling collections of simple multicurves Speaker: Andrew Yarmola, Princeton University Date: Oct 8, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: Consider a link L in the trivial circle bundle N over a surface S of negative Euler characteristic. If the fiber-wise projection of L to S is a collection C of closed curves in minimal position, then N L is hyperbolic if and only if C is filling and N L is acylindrical. We would like to understand the behavior of vol(N L) in terms of the topology of C. When C is a composed of simple closed curves and L is stratified, as we will define, we show that vol(N L) is quasi-isometric to expressions involving distances in the pants graph. When S is a punctured torus or a four punctured sphere and N = P T1 (S), we show that the tangent field lift of C is always stratified and that the volume is quasi-isometric to curve complex distance. In this talk, we will outline our proofs and give several natural examples of stratified links. This is joint work with T. Cremaschi and J. A. Rodriguez-Migueles. ______________________ Neil R. Hoffman Assistant Professor Department of Mathematics 523 Math Science Building Oklahoma State University Stillwater, OK 74078-1058 405-744-7791 http://math.okstate.edu/people/nhoffman

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Mdtop October 2019