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247 discussions

Topology seminar this week
by Hoffman, Neil 23 Oct '17

23 Oct '17

Hello everyone, There isn't a formal topology seminar this week. But we do have two really good geometry/topology talks by Sabetta Matsumoto, a colloquium on Thursday (in the building) and a public lecture (in the union) on Friday. The details are below (abstracts on the main page): Title: Programmable Matter: using 3D printed elastic anisotropy to direct shape transformation Speaker: Elisabetta Matsumoto (Georgia Tech.) Date: Oct 26, 2017 Time: 3:30 PM Room: MSCS 514 Title: Non-euclidean virtual reality Speaker: Elisabetta Matsumoto (Georgia Tech.) Date: Oct 27, 2017 Time: 3:30 PM Room: Student Union, Rm. 416 ______________________ 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 lunch, seminar, dinner, lunch
by Hoffman, Neil 18 Oct '17

18 Oct '17

Hello everyone, Brandy Doleshal will be speaking in seminar today. Her title and abstract are below. We are going to Cafe 88 for lunch now, if anyone is interested. Seminar is at 3:30 and we will be going out to dinner at 5:30 at Hideaway. Everyone is welcome. Also, we will probably be going out tomorrow for lunch as well. Email me if you are interested in that. Title: Surgery equivalent primitive/Seifert knots Abstract: The primitive/primitive and primitive/Seifert knots are families of knots on the genus 2 surface with the property that surgery at the surface slopes yields lens space and Seifert fibered space surgeries. We call two knots from this class surgery equivalent if they have the same surgery at the surface slope. In this talk, we will discuss what is known about surgery equivalent primitive/Seifert knots. This is joint work with Jeffrey Meier. ______________________ 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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I am speaking today
by Hoffman, Neil 11 Oct '17

11 Oct '17

Hello everyone, I am speaking today in seminar. Title: Infinite geometric triangulations of hyperbolic 3-manifolds Abstract: It is an open question if every cusped hyperbolic 3-manifold supports a geometric triangulation. More generally, one could ask which hyperbolic 3-manifolds support a infinite number number of geometric triangulations. Dadd and Duan showed that the figure 8 knot complement is one such example of this. After reviewing the background, I will discuss how to construct new examples of this phenomenon while dealing with some special cases involving two cusped manifolds. This is joint work with Jessica Purcell ______________________ 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, lunch and dinner with speaker
by Hoffman, Neil 27 Sep '17

27 Sep '17

Hello everyone, Today, Michelle Chu will be speaking in seminar. We will also be going to lunch today at Fuzzy's. Let's meet at the mailboxes on the 4th floor at noon. Robert is organizing that, but I will catch up with everyone after my office hours end. We are going to take Michelle to hideaway tonight at 5:30. Everyone is welcome to come to that as well. Finally, here are the title and abstract for today's talk: Title: Special subgroups of Bianchi groups Speaker: Michelle Chu, University of Texas at Austin Date: Sep 27, 2017 Time: 3:30 PM Room: MSCS 509 Abstract: The study of virtually special groups played a key role in the resolutions of some important conjectures in 3-manifold theory. In this talk I will motivate and introduce virtual properties of 3-manifold groups. I will also discuss some new results on quantifying these virtual properties for the class of Bianchi groups. ______________________ 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's talk
by Hoffman, Neil 20 Sep '17

20 Sep '17

Hello everyone, Our own Robert Haraway will be speaking today. His title and abstract are below: Title: Representing handle structures Speaker: Robert Haraway, OSU Date: Sep 20, 2017 Time: 3:30 PM Room: MSCS 509 Abstract: I’ll review a combinatorial representation of handle structures used in the work of Gabai, Meyerhoff, and Milley, which we use in our project to resolve the strong Gordon conjecture. ______________________ 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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Working Seminar today
by Hoffman, Neil 13 Sep '17

13 Sep '17

Hello everyone, Henry and I are giving a working seminar today. Our title and abstract are below: What is the Pachner graph? Speaker: Henry Segerman, Neil Hoffman, OSU Date: Sep 13, 2017 Time: 3:30 PM Room: MSCS 509 Abstract: This is the first in a series of working seminars. Henry and I will introduce some of the background for triangulations in order to state and motivate open problems in the field. ______________________ 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 Haraway today
by Hoffman, Neil 06 Sep '17

06 Sep '17

Today Robert is speaking in seminar his title and abstract are below: Title: Decompositions of 3-manifolds Time: 3:30 PM Room: MSCS 509 Abstract: In this introductory, expository talk, we motivate and review classical theorems of 3-manifold topology dealing with the decomposition of compact 3-manifolds along ”interesting” embedded surfaces. ______________________ 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 30 Aug '17

30 Aug '17

The department calendar is might be out sick today*, so I figured I would pass along the announcement for topology seminar today. We are very excited to have Andy speak. His title and abstract are below: Title: CAT(0) Extensions of Right-angled Coxeter Groups Abstract: CAT(0) spaces are spaces that model non-negatively curved behavior, and CAT(0) groups are those that act on such spaces in a sufficiently nice way. The CAT(0) property is not known to be preserved by abstract commensurability. Right angled Coxeter groups (RACGs) are an important class of examples with a variety of nice geometric, algebraic and algorithmic properties. I’ll discuss joint work with Charles Cunningham, Adam Piggott, and Kim Ruane in which we show that certain split extensions of RACGs are CAT(0), but for very different reasons depending on the type of extension. Time permitting, I’ll mention some interesting extensions for which the CAT(0) property has not been proved or disproved. This talk will be entirely accessible for grad students; I’ll give all necessary background. * At least for my mac with OSX 10.11.6 and google chrome Version 60.0.3112.101. ______________________ 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 tomorrow, Friday
by Hoffman, Neil 03 May '17

03 May '17

Hello everyone, There are 3 topology talks this week. Also, it looks like we will be organizing dinners tonight and Friday, but we will figure that out today after seminar. Today we have Kim Ruane: A Convex "Un-Combination" Theorem with Applications Room: MSCS 428 (not the tea room) 3:30 Abstract: https://www.mathdept.okstate.edu/announce/pdf/769.pdf Tomorrow we have Josh Howie: Hyperbolic geometry of weakly generalised alternating knots Room: MSCS 428 Abstract: <https://www.mathdept.okstate.edu/announce/viewpdf.php?talkid=755> https://www.mathdept.okstate.edu/announce/pdf/755.pdf Friday we have Kim Ruane's colloquium: Some Interesting Automorphism Groups Room: MSCS 514 Abstract: https://www.mathdept.okstate.edu/announce/pdf/760.pdf ______________________ 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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Jing Tao today, and the schedule for the end of the semester
by Hoffman, Neil 20 Apr '17

20 Apr '17

Hello topology group, Today begins a flurry of topology activity to close out the semester. April 19, 3:30pm in MSCS 428: Jing Tao (OU) - Thurston metric on Teichmuller space She will be sticking around for dinner, but we can organize that after seminar. Tuesday April 25, 3:30 pm in MSCS 428: Joseph Maher (CUNY) - Random walks on groups with negative curvature The following week we will have two visitors: Josh Howie (Monash) and Kim Raine (Tufts). Josh will be giving a seminar talk (see below) and Kim will be giving a seminar talk (Wednesday May 3) and a colloquium talk (Friday May 2). On Thursday, May 4 are people free at 2:30 for a seminar? 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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