Mdtop February 2022

mdtop@mathdept.okstate.edu

1 participants
2 discussions

Today in topology seminar
by Hoffman, Neil 21 Feb '22

21 Feb '22

Hello everyone, Today we are happy to have Joan Licata. Her title, abstract and the zoom link can be found below. Title: Diagrams for Three-Manifold Spines Speaker: Joan Licata, Australia National University/ICERM Date: Feb 22, 2022 Time: 3:00 PM Link: https://zoom.us/j/94529451960?pwd=ekkxYUsrRGt5bVdEQWJRN0JOZ04wZz09 Join our Cloud HD Video Meeting<https://zoom.us/j/94529451960?pwd=ekkxYUsrRGt5bVdEQWJRN0JOZ04wZz09> Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom Rooms is the original software-based conference room solution used around the world in board, conference, huddle, and training rooms, as well as executive offices and classrooms. Founded in 2011, Zoom helps businesses and organizations bring their teams together in a frictionless environment to get more done. Zoom is a publicly traded company headquartered in San Jose, CA. zoom.us Abstract: To study knots in R^3 , it’s natural to analyse the combinatorics of their projections to some plane. To generalise this to arbitrary three-manifolds, one can consider projections to spines, two-complexes which play an important role in computational topology. In addition to describing some results about spine projections of isotopic links, I’ll explain a connection to an open result about shadows of four-manifolds. The work I’ll describe is joint with Brand, Burton, Dancso, He, and Jackson. ______________________ 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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Tomorrow in Topology seminar
by Hoffman, Neil 14 Feb '22

14 Feb '22

Hello everyone, You are receiving this email because you signed up for the topology list some time before now. If you would like to be left off the list let me know and I can do that for you. If not, then this week I will be speaking in seminar. The zoom link for my talk is (full zoom info is at the end of the email): https://zoom.us/j/94529451960?pwd=ekkxYUsrRGt5bVdEQWJRN0JOZ04wZz09 Title: Fully Augmented Link complements and Bianchi Groups Speaker: Neil Hoffman, Oklahoma State Date: Feb 15, 2022 Time: 3:00 PM Room: Virtual Abstract: A Bianchi group is $PSL(2,O_d)$ for some $O_d$, the ring of integers in a quadratic imaginary field. These are some of the first and most well-studied Kleinian groups. A fully augmented link (FAL) is a natural diagrammatic object and its complement tends to have nice geometric properties as well. Some of the simplest FAL complements also cover the quotients of $H^3$ by Bianchi groups. In some sense, both objects give standard examples in 3-manifold topology. Two natural questions are then: 1) which fully augmented link complements have this property? 2) which Bianchi groups contain a fully augmented link group? As part of joint work (in progress) with Will Worden, we can answer both of these questions save a few boundary cases. An interesting corollary of our work so far is that no FAL complement decomposes into regular ideal tetrahedra. Topic: Okstate Topology Seminar Time: This is a recurring meeting Meet anytime Join Zoom Meeting https://zoom.us/j/94529451960?pwd=ekkxYUsrRGt5bVdEQWJRN0JOZ04wZz09 Meeting ID: 945 2945 1960 Passcode: JSJDecomp Join by Skype for Business https://zoom.us/skype/94529451960 ______________________ 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 February 2022