Mdtop January 2018

mdtop@mathdept.okstate.edu

4 participants
5 discussions

Henry's talk today
by Hoffman, Neil 30 Jan '18

30 Jan '18

Henry is speaking today in seminar. His title and abstract are below: >From veering triangulations to dynamic pairs Speaker: Henry Segerman, Oklahoma State University Date: Jan 30, 2018 Time: 3:30 PM Room: MSCS 509 Abstract: This is joint work with Saul Schleimer. Agol and Guéritaud show that if we take a closed manifold admitting a pseudo-Anosov flow without perfect fits, drilling the singular orbits of the flow give a cusped manifold that admits a veering triangulation. We prove the converse. Part of our proof goes through the theory of dynamic pairs, due to Lee Mosher. In this talk I will focus on this part of the proof. ______________________ 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

1 0

Topology seminar
by Henry Segerman 29 Jan '18

29 Jan '18

This week I will be speaking, 3:30 MSCS 509. Title: From veering triangulations to dynamic pairs Abstract: This is joint work with Saul Schleimer. Agol and Guéritaud show that if we take a closed manifold admitting a pseudo-Anosov flow without perfect fits, drilling the singular orbits of the flow give a cusped manifold that admits a veering triangulation. We prove the converse. Part of our proof goes through the theory of dynamic pairs, due to Lee Mosher. In this talk I will focus on this part of the proof.

1 0

SnapPy session
by Robert Haraway 16 Jan '18

16 Jan '18

Dear all, Next week we have planned a working session introducing the Python module SnapPy, for investigating hyperbolic 3-manifolds. Please install this (free) software on your laptop to participate. Installation instructions follow. 0.) Point your favorite web browser to the following link: https://www.math.uic.edu/t3m/SnapPy/installing.html 1.) Follow the instructions there based on your computer's operating system. You may also want to visit the tutorial page after installation, at https://www.math.uic.edu/t3m/SnapPy/tutorial.html See you next week. Best regards, Robert Haraway

1 0

Fwd: talk on Dehn-Kneser
by William Jaco 16 Jan '18

16 Jan '18

FYI. I plan to attend; if anyone needs a ride, let me know. William H. "Bus" Jaco Regents Professor, Grayce B. Kerr Chair, and Head Department of Mathematics ---------- Forwarded message ---------- From: Rubin, Leonard R. <lrubin(a)ou.edu> Date: Tue, Jan 16, 2018 at 12:48 PM Subject: talk on Dehn-Kneser To: "william.jaco(a)okstate.edu" <william.jaco(a)okstate.edu> Cc: "rowe(a)mathematik.uni-mainz.de" <rowe(a)mathematik.uni-mainz.de>, "Forester, Max B." <mf(a)ou.edu> Bus: I just noticed on your math website that you are getting a very nice award of recognition from your department. My congratulations. I wanted to call your attention to a talk that will be given here in our topology seminar on Wednesday, February 14 (see attached). David Rowe has been studying correspondence that had occurred between Kneser and Dehn I guess around 1929. It was at this time that Kneser had discovered a huge gap in Dehn’s proof of what we call Dehn’s lemma. David is going to talk about this. We are getting a great scoop because he has been invited by Cameron Gordon to speak at the UT colloquium in March on this very same topic. I hope that you and some of your colleagues would be able to attend. Our seminar usually begins at 3:45, but often when we have an outside speaker, it starts at 4:00, leaving time before it to have tea and cookies. The actual schedule has not yet been set. I kind of suggested to David that this might be a little less formal and a little bit free-form in the sense that some people might be there who could say at least a little bit about how and why such a lemma has an impact on the topology of 3-manifolds. It would be of interest to say something about why the loop theorem is superior to Dehn’s lemma (I do not know these things), which I found out by having a glance at John Hempel’s book. OK, so let me know what you think about all this. I certainly hope that you and others can attend. As usual, we would go out for dinner after the talk. Lenny

1 0

Organizational meeting today
by Hoffman, Neil 16 Jan '18

16 Jan '18

Happy start to the semester everyone! We will be holding our organizational meeting for the topology seminar today. As a reminder, the seminar will be held on Tuesdays from 3:30-4:30. Everyone is welcome to come. Graduate students are especially welcome. ______________________ 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

1 0

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

Mdtop January 2018