Mdtop

mdtop@mathdept.okstate.edu

247 discussions

Reading seminar cancelled!
by Schirmer, Trent 15 Oct '13

15 Oct '13

Hello Everyone, Just letting you know that I'm unilaterally cancelling the reading seminar, since Ben Burton is talking at the same time, and because, as the seminar organizer, I'm drunk with power. --Trent

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Seminar this afternoon.
by Jesse Johnson 03 Oct '13

03 Oct '13

Dear Topologists and Friends of Topology, Henry will be giving the seminar this afternoon (in about 20 minutes) on "Regular triangulations and the index of a cusped hyperbolic 3-manifold". (Sorry I forgot to send this reminder earlier!) Jesse

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Seminar this afternoon
by Jesse Johnson 19 Sep '13

19 Sep '13

Dear Topologists and Friends of Topology, This is a reminder that we have a topology seminar this afternoon. I'll be the speaker, and it will have something to do with Heegaard splittings and hyperbolic geometry. Usual time and place: MSCS 519 at 3:30. Jesse

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Seminar this afternoon
by Jesse Johnson 12 Sep '13

12 Sep '13

Dear Topologists and Friends of Topology, Danielle O'Donnol will give the seminar this afternoon, at 3:30 in MSCS 514. Title: Graph Floer Homology. Jesse

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Topology reading seminar
by Schirmer, Trent 05 Sep '13

05 Sep '13

Hello Everyone, The first topology reading seminar will be held next wednesday in room 509, 4:30-5:30. None today though. Here is the mathscinet link to the paper that will be the main focus of our seminar: http://www.ams.org/mathscinet/search/publdoc.html?pg1=IID&s1=155620&vfpref=… For some reason I am not allowed to download the pdf today even though I logged in through the university. Maybe you will have better luck. My talk next week will be general background on the problem. I will discuss property R stuff too, as it's important to this paper. Also, we might spend some time going over a paper Sean sent me before the semester is out. Best, Trent

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Seminar this afternoon
by Jesse Johnson 29 Aug '13

29 Aug '13

Dear Topologists and Friends of Topology, The first topology seminar of the semester will be this afternoon at 3:30 in MSCS 514. The speaker is Sean Bowman and the title is "Bridge numbers of twisted torus knots". We will also discuss times for the reading seminar, so if you plan to participate in the reading seminar, please bring your calendar. Jesse

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Meeting times
by Schirmer, Trent 28 Aug '13

28 Aug '13

Hello Everyone, Right now I'm putting together some material on the slice-ribbon conjecture. My plan is to find some kind of survey paper on slice knots and knot cobordisms and spend the first session or two just sort of familiarizing ourselves with the problem and stuff that is known about it. There are two big papers on the subject recently. One is the Gompf-Scharlemann-Thompson paper which exhibits a class of potential counter-examples to the conjecture, another is a paper by somebody else whose name I've forgotten which verifies the conjecture for all Montesinos knots. I'm thinking that it might be better to focus on the Gompf-etc paper because I find it distasteful to have to think about Montesinos knots. And besides, I really am hoping to sort of familiarize myself with more 4 dimensional type theory, and view the whole subject as sort of a natural bridge into 4-d topology for 3-manifold people like me. So the tentative plan is that after the first two weeks of introduction, every week somebody covers some section of the Gompf-etc. paper thoroughly. The idea being that they even track down references and explain things in detail, so that all the attendant 4-manifold theory is sort of talked about as well. But I'm totally open to suggestions Could everyone who's interested e-mail me the meeting times that work for them? Thanks. Also e-mail me with good ideas for making the seminar useful to everyone. Best, --Trent

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Topology Seminar Organizational Meeting
by Jesse Johnson 20 Aug '13

20 Aug '13

Dear Topologists and Friends of Topology: We will have an organizational meeting for the topology seminar this Thursday at 3:30 in MSCS 514. We'll be looking for both volunteers who can give a talk some time in the Fall, and suggestions for outside speakers to invite. Jesse

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Seminar today
by Jesse Johnson 18 Apr '13

18 Apr '13

Dear Topologists and Friends of Topology, Bo-hyun will be giving today's seminar talk at 3:30 in MSCS 514. Title: An Algorithm to detect three bridge knots which are in bridge positions Abstract: The Bracket Polynomial is invariant under a regular isotopy but it is not isotopy invariant because it is not invariant under a type I Reidemeister move. Kauffman, however, found Kauffman Polynomial by that would make the polynomial isotopy invariant and make the polynomial equivalent to the Jones Polynomial. I would like to present a way to calculate the Kauffman Polynomial of two bridge presentation knots and three bridge presentation knots by using four $2\times 2$ matrices and eight $5\times 5$ matrices respectively. This one can help us to detect three bridge knots which are in three bridge position.

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Seminar Tomorrow
by Jesse Johnson 10 Apr '13

10 Apr '13

Dear Topologists and Friends of Topology, Will Cavendish from Oxford University will be giving the seminar talk tomorrow (Thursday) at 3:30 in MSCS 514. Title: Topological methods for engulfing subgroups Abstract: Given a group $G$ and a subgroup $H$, $H$ is said to be engulfed in $G$ if $H$ can be distinguished from $G$ by looking at maps to finite groups, i.e. if there exists a homomorphism $\phi:G \to F$ where $F$ is finite and $\phi(H)\ne \phi(G)$. In this talk, we will discuss some of the topological applications of engulfing in the context of 3-manifold theory, and then demonstrate how engulfing can be understood in terms of the cohomology of interesting topological spaces called solenoids.

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