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Dinner tonight
by Hoffman, Neil 14 Apr '17

14 Apr '17

Dear Andy, Andreas, and Eric, (cc Bus and Bob) Tonight, we will be taking the colloquium speaker out for dinner around 6pm. If you guys are free, I would highly encourage you to come. See you at colloquium. -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 today
by Henry Segerman 12 Apr '17

12 Apr '17

Location: MSCS 428 Date and Time: Wednesday, April 12, 2017 - 3:30pm to 4:30pm Henry Segerman (Oklahoma State University) Connectivity of the set of triangulations of a 3- or 4-manifold Abstract: This is joint work with Hyam Rubinstein. Matveev and Piergallini independently show that the set of triangulations of a three-manifold is connected under 2-3 and 3-2 Pachner moves, excepting triangulations with only one tetrahedron. We give a more direct proof of their result which (in work in progress) allows us to extend the result to triangulations of four-manifolds.

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Two schedule changes for topology seminar
by Hoffman, Neil 06 Sep '16

06 Sep '16

Hello everyone, This week topology seminar will be from 4-5 (in MSCS 509) as opposed to 3:30-4:30. I will be speaking. Next month there are two colloquiums scheduled for the week of October 17. Consequently, our seminar is scheduled for Wednesday October 19th from 4-5 in MSCS 405. Ken Baker (University of Miami) will be visiting the department that week. 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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Reminder: Maria Trnkova will speak in the topology seminar 3:30 today, MSCS 422
by Henry Segerman 20 Apr '16

20 Apr '16

Title: Length spectrum of a hyperbolic 3-manifold Abstract: Every geodesic in hyperbolic 3-manifold has a naturally defined complex length. All geodesics in a manifold can be ordered by their length lexicographically and create a length spectrum. There is a one-to-one correspondence between fundamental group of a hyperbolic 3-manifold and its length spectrum. In the first part of the talk we will describe some facts about length and ortholength spectra of hyperbolic 3-manifolds and demonstrate the working algorithm for the spectra. In the second part we'll consider applications of this algorithm to the proof of Exceptional Manifolds Conjecture and Dehn parental test.

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Maria Trnkova will speak in the topology seminar, MSCS 422, Wed 3:30-4:30
by Henry Segerman 17 Apr '16

17 Apr '16

Title: Length spectrum of a hyperbolic 3-manifold Abstract: Every geodesic in hyperbolic 3-manifold has a naturally defined complex length. All geodesics in a manifold can be ordered by their length lexicographically and create a length spectrum. There is a one-to-one correspondence between fundamental group of a hyperbolic 3-manifold and its length spectrum. In the first part of the talk we will describe some facts about length and ortholength spectra of hyperbolic 3-manifolds and demonstrate the working algorithm for the spectra. In the second part we'll consider applications of this algorithm to the proof of Exceptional Manifolds Conjecture and Dehn parental test.

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Fwd: redbud registration
by Henry Segerman 09 Mar '16

09 Mar '16

Last chance to register for Redbud with funding is Friday. http://www.math.ou.edu/redbud/ April 1-3, 2016, OU. Henry ---------- Forwarded message --------- From: Max Forester <forester(a)math.ou.edu> Date: Wed, Mar 9, 2016 at 3:35 PM Subject: redbud registration To: Matthew T. Clay <mattclay(a)uark.edu>, Henry Segerman < segerman(a)math.okstate.edu> Hi Matt and Henry, We have passed our registration deadline for people requesting funding, but we can still handle a few more if they are quick. Could you let people in your departments know one more time that they should register if they plan to come? We need registrations by this Friday at the latest. We have had a large number of graduate students from all over registering, and we are having to make decisions about who gets funding and how much we can give them. This is the reason for the urgency. We need to tell people what they can expect so they can plan accordingly. thanks, Max

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Spring Redbud conference, April 1-3, 2016 University of Oklahoma
by Henry Segerman 12 Feb '16

12 Feb '16

Deadlines for funding/hotel decisions are coming up!: http://www.math.ou.edu/redbud/ Henry

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Reading seminar on Matveev's proof of connectivity of triangulations under 2-3 moves
by Henry Segerman 27 Jan '16

27 Jan '16

Hi all, Trent and I will be reading Matveev's proof that the set of (one vertex, or ideal) triangulations of a given 3-manifold are connected under 2-3 moves, 4:30-5:30 on Wednesdays. Let me know if anyone else is interested in joining in. Henry

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Kenji Kozai visiting
by Henry Segerman 22 Apr '15

22 Apr '15

Kenji Kozai will be visiting from Berkeley this Thursday and Friday. Let me know if you would like to join us for lunch on Thursday. Kenji will speak in the topology seminar on Thursday: Hyperbolic structures from Sol Abstract: Thurston's hyperbolization theorem states that the mapping torus of a surface homeomorphism is a hyperbolic 3-manifold if and only if the homeomorphism is pseudo-Anosov. On the other hand, the stretch-squeeze dynamics of the pseudo-Anosov define a natural (singular) Sol metric on the mapping torus, where the singular locus is the orbit of the singular points of the stable and unstable foliations. In the case where the surface is a punctured torus, it is known from results of Hodgson and Heusener-Porti-Suarez that the Sol structure can be obtained as a rescaled limit of hyperbolic cone structures -- in other words, hyperbolic structures can be regenerated from Sol. Using different methods, the result is generalized to pseudo-Anosov maps on higher complexity surfaces, as long as the invariant foliations of the pseudo-Anosov are orientable and the first Betti number of the mapping torus is 1.

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Topology Seminar Today
by Odonnol, Danielle 16 Apr '15

16 Apr '15

Hello, Just a reminder we will have Pengcheng Xu speaking in Topology Seminar this afternoon. Title: P-moves between pants block decompositions of 3-manifolds Room: MSCS 514 Time: 3:30

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