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247 discussions

Redbud registration
by Hoffman, Neil 15 Mar '19

15 Mar '19

Hello everyone, If you haven't registered for Redbud, do it today, because the first registration deadline is TODAY: The registration link is here: http://www.math.ou.edu/conferences/redbud/spring-2019/ The last time I check I was the lone OSU person registered. If that holds, I suppose I will be driving to Norman with Eric Carmen on repeat. Obviously, I would just assume not do that. 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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Seminar today
by Hoffman, Neil 12 Mar '19

12 Mar '19

Title: Which hyperbolic knot complements have hidden symmetries? Speaker: Jason Deblois, University of Pittsburgh Date: Mar 12, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: Neumann and Reid asked the titular question in the early 1990’s, and it remains unresolved. I’ll survey what we have learned to this point, then discuss joint work with Eric Chesebro and Priyadip Mondal on exhibiting many families that lack hidden symmetries. ______________________ 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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redbud registration
by Hoffman, Neil 07 Mar '19

07 Mar '19

Hello everyone, The spring Redbud 2019 conference has been announced. It will be held at Norman this year April 26-28. If you are planning on going, please register by March 15 so it will help organizers* get a sense on numbers. It looks to be a good conference and I would encourage everyone to consider attending. Best, Neil * The real organizers are Max, Jing and Justin. I don't want to take any credit that is rightfully theirs. ---------- Forwarded message --------- From: Max Forester <mf(a)ou.edu<mailto:mf@ou.edu>> Date: Tue, Jan 22, 2019 at 12:20 PM Subject: 2019 Redbud Topology Conference: First Announcement To: <geometry(a)listserv.utk.edu<mailto:geometry@listserv.utk.edu>> Dear Colleagues, We are pleased to announce the Spring 2019 Redbud Topology Conference, which will be held at the University of Oklahoma, April 26-28, 2019. Website: http://www.math.ou.edu/conferences/redbud/spring-2019/ RedbudCon'Sp19™<http://www.math.ou.edu/conferences/redbud/spring-2019/> www.math.ou.edu Juliette Bavard (Rennes) &bullet; Mladen Bestvina (Utah) &bullet; Michelle Chu (Santa Barbara) Jingyin Huang (Ohio State) &bullet; Kasia Jankiewicz (Chicago) &bullet; Dan Margalit (Georgia Tech) Email: RedbudConSp19(a)gmail.com<mailto:RedbudConSp19@gmail.com> Speakers: Juliette Bavard (Rennes) Mladen Bestvina (Utah) Michelle Chu (Santa Barbara) Jingyin Huang (Ohio State) Kasia Jankiewicz (Chicago) Dan Margalit (Georgia Tech) Andy Putman (Notre Dame) Yulan Qing (Toronto) Balázs Strenner (Georgia Tech) The Redbud conference is a regional conference in topology and related areas, with participants from the University of Arkansas, the University of Oklahoma, Oklahoma State University, and elsewhere. This year's conference is centered on topics in geometric group theory and low dimensional topology. Friday April 26 will be a graduate workshop with introductory talks and lightning talks by students. The main conference will take place Saturday and Sunday, April 27-28. Some funding is available; please register at the conference website by March 15, 2019 to receive full consideration. Graduate students, recent Ph.D.s, and mathematicians in underrepresented groups are especially encouraged to apply. Best regards, the Redbud organizers (Noel Brady, Matt Clay, Max Forester, Neil Hoffman, Justin Malestein, Henry Segerman, Jing Tao) ______________________ 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 seminar
by Hoffman, Neil 05 Mar '19

05 Mar '19

Today in Topology we have Alex Casella visiting the department. His title and abstract are below. Title: Cauchy Riemann Structures Of Once-Punctured Torus Bundles Speaker: Alex Casella, Florida State University Date: Mar 5, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: The Cauchy-Riemann geometry (CR in short) is modelled on the three sphere and the group of its biholomorphic transformations. In 2008, Falbel makes use of ideal triangulations to shows that the figure eight knot complement admits a (branched) CR structure. This three manifold belongs to a larger class of important three manifolds that are fiber bundles over the circle, with fiber space the once-punctured torus. In this talk we introduce the audience to these manifolds and show that almost every once-punctured torus bundle admits a (branched) CR structure. ______________________ 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 26 Feb '19

26 Feb '19

Hello everyone, Today in topology we have Christine Ruey Shan Lee from the University of South Alabama. Contact Henry if you are interested in going out to lunch with the speaker. Her title and abstract are below: Title: A surface construction for colored Khovanov homology Speaker: Christine Ruey Shan Lee, University of South Alabama Date: Feb 26, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: Colored Khovanov homology is a categorification of the colored Jones polynomial. To each integer n ≥ 2 and a diagram D of a link, it assigns a bigraded chain complex {C^{Kh}_{ i,j} (D, n)}. The graded Euler characteristic of the homology groups {H^{Kh}_{ i,j} (D, n)} gives the nth colored Jones polynomial. It has typically been difficult to extract topological information from colored Khovanov homology due to its dependence on the combinatorics of link diagrams. Inspired by Bar-Natan’s formulation of Khovanov homology for tangles and other approaches to topological formulations for Khovanov homology by McDougall and Seidel-Smith, we will give a construction of colored Khovanov homology of a knot in terms of embedded surfaces in the complement to more intrinsically motivate it using topology, and we will discuss potential applications. ______________________ 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
by Hoffman, Neil 20 Feb '19

20 Feb '19

Hello everyone, Due to the snow day, Bo-hyun's talk from yesterday was postponed until today. Apologies on the short notice on the change, we had to find a room and a time which was free. The seminar will be at 2:30 today in MSCS 422. If anyone is interested in joining Bo-hyun and me for lunch meet at the mailboxes at noon. Title: On weak reducing disks for the unknot in 3-bridge position Speaker: Bo-hyun Kwon, Korea University Date: Feb 20, 2019 Time: 2:30 PM Room: MSCS 422 Abstract: In this talk, we show that the complex of weak reducing disks for the unknot in 3-bridge position is contractible. This is joint work with Dr. Jung Hoon Lee. ______________________ 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 seminar
by Hoffman, Neil 12 Feb '19

12 Feb '19

Hello everyone, Today we have an OSU alum Bo-hyun Kwon speaking in seminar today. He is visiting from Korea University. He will be visiting for the next two weeks and using the spare office on the fifth floor. His title and abstract are below: Title: The Rectangle condition and its applications Speaker: Bo-hyun Kwon, Korea University Date: Feb 12, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: In this talk, we define the rectangle condition and connecting rectangle condition to check whether or not a Heegaard splitting is strongly irreducible which is a variation of the rectangle condition by Casson and Gordon. Moreover, with a similar condition defined on a n-bridge decomposition, we can check whether or not the Hempel distance of a n-bridge decomposition is greater than or equal to two. Then, we can define a generalized rectangle condition. We also give specific examples for Heegaard splitting of 3-manifolds and n-bridge decomposition of knots which satisfy the connecting rectangle condition. ______________________ 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 05 Feb '19

05 Feb '19

Today (Tuesday) Henry will be giving a VR demonstration in MSCS 421 at 3:30. ______________________ 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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Robert speaking today
by Hoffman, Neil 29 Jan '19

29 Jan '19

Hello everyone, Today Robert is finishing up his talks on polynomial pinching. Title: Polynomial pinching (Part 2) Speaker: Robert Haraway, Oklahoma State University Date: Jan 29, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: In joint work with Neil Hoffman, we use the algorithm of Agol, Hass, and Thurston to give a construction of an ideal triangulation of the exterior of a normal surface S in a triangulation T that is polynomial in space and time of order |T| ∗ log |S|, where |T| is the number of tetrahedra and |S| is the total weight |S ∧ T|. (Part 2 of 2) ______________________ 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 today
by Hoffman, Neil 22 Jan '19

22 Jan '19

Hello everyone, Just a reminder that Robert is presenting in topology seminar today. This kicks off a rather busy semester for seminar. Right now, we only have April 9 and 16 open. Robert's title and abstract are below: Title: Polynomial pinching Speaker: Robert Haraway, Oklahoma State University Date: Jan 22, 2019 Time: 3:30 PM Room: MSCS 509 Abstract: In joint work with Neil Hoffman, we use the algorithm of Agol, Hass, and Thurston to give a construction of an ideal triangulation of the exterior of a normal surface S in a triangulation T that is polynomial in space and time of order |T| ∗ log |S|, where |T| is the number of tetrahedra and |S| is the total weight |S ∧ T|. (part 1 of 2) ______________________ 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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