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247 discussions

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.

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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

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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

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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

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Seminar today postponed
by Hoffman, Neil 13 Dec '17

13 Dec '17

Hello everyone, Seminar today is postponed until next semester. So mark your calendars for Tuesday, January 16th as Bus will be giving part 2 of his talk from last week then. Best, Neil ______________________ 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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Three events to round out the end of the semester
by Hoffman, Neil 01 Dec '17

01 Dec '17

Hello everyone, I wanted to call to your attention three events that are happening before the end of finals. First, Bus is giving two talks: Thursday December 6 at 3:30 in 514 Wednesday December 12 at 3:30 in 509 Also Dave Bachman is visiting the department for the final colloquium of the semester on Friday December 7th at 3:30 in 514. Hope to see everyone there! Best, Neil ______________________ 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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Topology seminar tomorrow at 3:00
by Hoffman, Neil 27 Nov '17

27 Nov '17

Hello everyone, Tomorrow we will have topology seminar at 3:00 pm in the 405/423 classroom. The title and abstract are below: Title: A local to global argument on low dimensional manifolds Speaker: Sam Nariman, Northwestern Date: Nov 28, 2017 Time: 3:00 PM Room: MSCS 423 Abstract: We describe a local to global method by cutting a manifold into simpler pieces in a ”contractible spaces of choices”. In doing so, we give a simpler approach to Thurston’s theorem on homeomorphisms, Cerf’s theorem on comparing diffeomorphisms and homeomorphisms of three manifolds. If time permits I will describe how this approach could possibly give a different proof of Smale’s conjecture (Gabai’s theorem) for hyperbolic 3 manifold M which says that the group Isom(M) is homotopy equivalent to Diff(M). (Note the special day.) ______________________ 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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Henry is speaking today
by Hoffman, Neil 08 Nov '17

08 Nov '17

Hello everyone, Henry will be speaking today in seminar. His title and abstract are below: >From veering triangulations to pseudo-Anosov flows Speaker: Henry Segerman, OSU Date: Nov 8, 2017 Time: 3:30 PM Room: MSCS 509 Abstract: Agol introduced veering triangulations of mapping tori, whose combinatorics are canonically associated to the pseudo-Anosov monodromy. Guéritaud and Agol generalised an alternative construction to any closed manifold equipped with a pseudo-Anosov flow without perfect fits. We prove the converse, showing that veering triangulations are a perfect combinatorialisation of such flows. ______________________ 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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Fw: fall redbud
by Hoffman, Neil 03 Nov '17

03 Nov '17

Hello everyone, If you are planning on going to redbud, fill out the travel authorization form and email it to Matt Clay <mattclay(a)uark.edu>. Here are instructions about the vendor ID form. >If they participated in the Spring Redbud at UArk, we should have their >vendor id form on file and there is no need to send another. Else, or if >they moved, they will need to complete this form as well. If they are only >updating an address, they can skip the SSN. If you want a per diem or mileage reimbursement, fill out the form. Also, Henry is driving out in his car to redbud. We have two other passengers in that car. Robert and Henry you guys are speaking so let me know which one of you is driving. Anyone else who plans on going let me know when you send in the form. Best, Neil ______________________ 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 ________________________________ From: Matt Clay <mattclay(a)uark.edu> Sent: Friday, November 3, 2017 2:49 PM To: Hoffman, Neil Subject: Re: fall redbud Hi Neil, I attached the travel authorization form, please forward to folks at OSU planning to go to Redbud. We will definitely pay mileage and might be able to pay per diem, we’ll have to see how far the funds strecth. Drivers should complete the form and if non-drivers want the possibility of per diem, they should complete too. Have OSU participants email this back to me quickly. If they participated in the Spring Redbud at UArk, we should have their vendor id form on file and there is no need to send another. Else, or if they moved, they will need to complete this form as well. If they are only updating an address, they can skip the SSN. People can emial me with questions. Also, I’m glad to see that you are visiting here in a couple of weeks. I put your title/abstract online. Let me know if it looks wrong: http://comp.uark.edu/~mattclay/TopologySeminar/Fall2017/171116.html Best Regards, Matt ------------------------------------ Matthew T. Clay Associate Professor Department of Mathematical Sciences University of Arkansas 479-575-5195 ------------------------------------ On Oct 30, 2017, at 1:56 PM, Hoffman, Neil <neil.r.hoffman(a)okstate.edu<mailto:neil.r.hoffman@okstate.edu>> wrote: Hi Matt, I think we are probably going to drive out for one day. I will try to pin down a list of cars, but probably 2 or 3 are going out. Best, Neil ______________________ 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<https://urldefense.proofpoint.com/v2/url?u=http-3A__math.okstate.edu_people…> ________________________________ From: Matt Clay <mattclay(a)uark.edu<mailto:mattclay@uark.edu>> Sent: Monday, October 30, 2017 9:21:19 AM To: Hoffman, Neil Subject: fall redbud Hi Neil, Do you know how many cars you’ll be taking down to Norman for the fall redbud? Are you all planning on making it a one day deal or is anyone planning to stay overnight? Best Regards, Matt ------------------------------------ Matthew T. Clay Associate Professor Department of Mathematical Sciences University of Arkansas 479-575-5195 ------------------------------------

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Redbud Fall 2017 in Norman
by Hoffman, Neil 30 Oct '17

30 Oct '17

Hello everyone, On November 18th, OU is hosting the fall redbud conference. Andy and Robert are speaking. It would be great to have a strong presence out there. 1) Could you let me know if you are interested coming? 2) Would you be able to drive there? If so, how many people can you fit in your car? ______________________ 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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