Mdtop April 2019

mdtop@mathdept.okstate.edu

1 participants
3 discussions

Today in Topology
by Hoffman, Neil 23 Apr '19

23 Apr '19

Today we are happy to welcome Michelle Chu back. She is stopping by here before going off to redbud this weekend. Also, today after seminar we can organize redbud travel as best as possible. Title: Coxeter groups, arithmetic reflection groups, and Vinberg’s algorithm Speaker: Michelle Chu, UCSB Date: Apr 23, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: Coxeter groups and arithmetic reflection groups are broad classes of groups relevant to the study of hyperbolic manifolds. To make this connection more concrete we can build a fundamental domain for a hyperbolic reflection group using Vinberg’s algorithm. In this expository talk I will introduce and discuss these ideas, which will serve to give some of the important background for my talk at Redbud later in the week. ______________________ 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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Birch today
by Hoffman, Neil 16 Apr '19

16 Apr '19

Hello everyone, Today we are very happy to have Birch speaking in seminar. His title and abstract are below. Also, we have two more talks this semester. Michelle Chu from UCSB next week and Hailey Bodiford in three weeks. Title: Prime Decomposition of Surfaces by Crushing Speaker: Birch Bryant, Oklahoma State University Date: Apr 16, 2019 Time: 3:30 PM Room: MSCS 5109 Abstract: Joint project with William Jaco. Following the steps for the prime decomposition of 3-manifolds laid out in the Jaco & Rubinstein paper “0- Efficient Triangulations of 3- Manifolds” we construct the analogous (and well known) result for surfaces. That being the torus and real projective plane are the prime surfaces with respect to the connect sum operation on surfaces. Further the decomposition of surfaces into prime elements can be written uniquely up to homeomorphism. ______________________ 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 topology
by Hoffman, Neil 02 Apr '19

02 Apr '19

Today, I will be speaking in topology. Title: Restricting covers and symmetries of Dehn fillings Speaker: Neil Hoffman, Oklahoma State University Date: Apr 2, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: This talk will focus on the thick/thin decomposition of hyperbolic 3-manifolds and 3-orbifolds. I will describe how it relates to joint work in progress with Millichap and Worden. ______________________ 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 April 2019