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247 discussions

Organizational Meeting today
by Hoffman, Neil 15 Jan '19

15 Jan '19

Hello everyone, The organizational meeting for the topology seminar will be held today at 3:30 in MSCS 509. Hope to see you there. If you can't make it today, but are interested in speaking this semester. We have open dates of: January 29 February 5 February 26 March 26 April 2, 9, 16, 30 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 time and job talks
by Hoffman, Neil 04 Jan '19

04 Jan '19

Hello everyone, Our seminar will be on Tuesdays from 3:30-4:30 in MsCS 509. We will be holding an organizational meeting once the semester starts, but please keep this time free when scheduling office hours and other appointments. Also, this semester there will be a number of job talks on Mondays and Fridays at 3:30. Please try to keep these times free as it is important to have a good audience for these events. 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 04 Dec '18

04 Dec '18

Hello everyone, Today Duncan McCoy will be speaking in seminar. His title and abstract are below: Title: Characterizing slopes for hyperbolic and torus knots Speaker: Duncan McCoy, University of Texas Date: Dec 4, 2018 Time: 2:30 PM Room: MSCS 405 Abstract: Given a knot $K$ in $S^3$, we say that $p/q$ is a characterizing slope if the oriented homeomorphism type of $p/q$-surgery on $K$ is sufficient to uniquely determine the knot $K$. It is known that for a given torus knot all but finitely many non-integer slopes are characterizing and that for hyperbolic knots all but finitely many slopes with $q> 2$ are characterizing. I will discuss the proofs of both results, which have a surprising amount in common. ______________________ 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 13 Nov '18

13 Nov '18

Hello everyone, I am speaking today in seminar. I will speak about Knot complements covering orbifolds I will speak about when hyperbolic knot complements cover orbifolds. This will be a gentle introduction to these ideas. The seminar is today at 2:30 in MSCS 405. ______________________ 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 23 Oct '18

23 Oct '18

Hello everyone, We have seminar today. Amey Kaloti will be speaking on "Embedding questions for Weinstein and contact manifolds" His title and abstract are below. Also, we will be taking Amey out for dinner tonight at hideaway. Meet at my office around 5:15 if you are interested in that. Embedding questions for Weinstein and contact manifolds. Speaker: Amey Kaloti, University of Arkansas Date: Oct 23, 2018 Time: 2:30 PM Room: MSCS 405 Abstract: We describe a framework for embedding Weinstein 4-manifolds into Weinstein 6-manifolds using Lefschetz fibrations. The process also reframes the ”spun embeddings” of Etnyre and Lekili used to describe embeddings of contact 3-manifolds into contact 5-manifolds. We’ll discuss obstructions as well as examples including Weinstein 6-manifolds which contain all Weinstein 4-manifolds as properly embedded Weinstein submanifolds. Joint work with Jeremy Van Horn-Morris. ______________________ 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 09 Oct '18

09 Oct '18

Hello everyone, Seminar is today in 405. Nick Castro from UArk is speaking his title and abstract are below: Lefschetz Fibrations and Relative Trisections Speaker: Nickolas Castro, University of Arkansas Date: Oct 9, 2018 Time: 2:30 PM Room: MSCS 405 Abstract: A relative trisection of a smooth 4-manifold with boundary is a decomposition into three diffeomorphic, codimension zero subspaces whose pairwise intersections are 3-dimensional cobordisms, and triple intersection is a surface with boundary. Such a decomposition can be uniquely described by a collection of curves on this surface, called a relative trisection diagram. From this diagram, we can algorithmically determine the structure induced on the bounding 3-manifold(s), called an open book decomposition. A Lefschetz fibration on a smooth 4-manifold is a map which is locally a surface bundle away from its isolated critical points. Lefschetz fibrations can also be described by curves on a surface and, in the case of manifolds with boundary, also induce an open book decomposition on the boundary. In this talk, I will define these structures and discuss how to obtain a trisection from a Lefschetz fibration. I will present an alternate proof on the existence of trisection of closed 4-manifolds by way of Lefschetz fibrations and the gluing theorem. Finally, I will discuss the uniqueness of relative trisections which induce different open book decompositions. ______________________ 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 11 Sep '18

11 Sep '18

Hello everyone, Today Henry will be speaking at 2:30 in room 405. His title and abstract are here: Title: Dehn surgery by shearing Abstract: I’ll talk about a new (to me) way to think about Dehn surgery. We implement (p,q) Dehn surgery within a solid torus by slicing along an annulus from the boundary to the core curve, then regluing with a varying amount of shear around the annulus. ______________________ 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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Max Forester Today
by Hoffman, Neil 04 Sep '18

04 Sep '18

Hello everyone, Today Max Forester will be speaking in seminar (2:30 in room 405). His title and abstract are here: Title: Genus bounds in right-angled Artin groups Abstract: I will discuss how to find lower bounds for stable commutator length in rightangled Artin groups. The method has two parts: an easy topological argument, and an argument involving properties of CAT(0) cube complexes. ______________________ 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
by Henry Segerman 04 Sep '18

04 Sep '18

Max Forester will speak in the topology seminar (2:30-3:30 today, MSCS 405). Title: Genus bounds in right-angled Artin groups. Abstract: I will discuss how to find lower bounds for stable commutator length in right- angled Artin groups. The method has two parts: an easy topological argument, and an argument involving properties of CAT(0) cube complexes. Henry

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Topology seminar this semester
by Hoffman, Neil 17 Aug '18

17 Aug '18

Hello everyone, This semester our topology seminar will be held on Tuesdays from 2:30-3:30 in MSCS 405/428. We will have our first organizational meeting Tuesday August 28 and go from there. ______________________ 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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