Mdtop

mdtop@mathdept.okstate.edu

247 discussions

Topology Seminar on Thursday
by Odonnol, Danielle Odonnol 03 Feb '14

03 Feb '14

Dear Topologists and Friends of Topology, We will have a seminar this Thursday (MSCS 514 at 3:30) given by Shelly Harvey, from Rice University. Title: Metric Aspects of Knot Concordance Abstract: We are interested in the set of knot up to concordance, denoted C. C is an abelian group but its structure is not very well understood. We propose a new approach to understanding C, namely considering C as a metric space on which there exists many natural operators. Since one example of such an operator is connected-sum with a fixed knot, this approach is arguably more general than focusing on C as an abelian group. In fact, it was previously suggested by the authors along with C. Leidy that C is a fractal space and the proposed self-similarities of C are classical satellite operations. Very recently, Cochran-Davis-Ray proved that many of these satellite operators (strong winding number 1) are indeed injective, modulo the smooth 4-dimensional Poincare Conjecture . We show that that these operators are, in fact, isometric embeddings while winding number zero satellite operators are, by contrast, approximate contractions. This is joint work with Tim Cochran.

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No Topology Seminar This week
by Odonnol, Danielle Odonnol 27 Jan '14

27 Jan '14

Hello, There will be no Topology Seminar this week, due to the conflict with the Colloquium on Thursday 4-5pm. Cheers, Danielle

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Topology Seminar this Thursday
by Odonnol, Danielle Odonnol 21 Jan '14

21 Jan '14

Hello Topologists and Friends, Sean has graciously offered to speak this Thursday. There will be a few more free spots throughout the semester, about one a month. Please let me know if you would like to give a talk. Our next open slot is Feb. 20th. Seminar will be at 3:30 on Thursday in MSCS 514. Speaker: Sean Bowman Title: The generalized wrapping number Abstract: The wrapping number of a knot in a solid torus is the minimum number of times the knots meets a meridian disk. I'll describe a generalization of this notion for knots in handlebodies and construct an infinite family of knots distinguished by this invariant.

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Organizational Meeting this Thursday 3:30 in 514
by Odonnol, Danielle Odonnol 14 Jan '14

14 Jan '14

Hello Topologists and Friends, I hope that you had a good break. Please come with your Thursdays schedules, or email it to me if you cannot come. We may need to move the seminar on some days because of Faculty Interview talks. I would like to find a time that will still work for everyone. Cheers, Danielle

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Spring Topology Seminar
by Odonnol, Danielle Odonnol 02 Jan '14

02 Jan '14

Hello Topologists and Friends, I hope you are having a good break! I am going to be organizing the topology seminar this spring. Please let me know if you have someone lined up for the seminar or would like me to invite someone on your behalf. We have a few people lined up and I have put them on the calender: https://www.math.okstate.edu/announce/ Cheers, Danielle

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Seminar tomorrow
by Jesse Johnson 13 Nov '13

13 Nov '13

Dear Topologists and Friends of Topology, The topology seminar tomorrow (MSCS 514 at 3:30) will be by Ken Baker from the University of Miami. Title: On non-looseness of non-loose knots Abstract: A contact structure on a 3-manifold is called overtwisted if there is a certain kind of embedded disk called an overtwisted disk; it is tight if no such disk exists. A Legendrian knot in an overtwisted contact 3-manifold is loose if its complement is overtwisted and non-loose if its complement is tight. We define and compare two geometric invariants, depth and tension, that measure how far from loose is a non-loose knot. This is joint work with Sinem Onaran.

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CANCELLATION!!!
by Schirmer, Trent 30 Oct '13

30 Oct '13

Hello Everyone, The reading seminar is cancelled this week because of a visitor. However, next week it is on, and I will be presenting. Best, Trent

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Seminar dinner on Wednesday (not Thursday)
by Jesse Johnson 29 Oct '13

29 Oct '13

Dear Topologists and Friends of Topology, Our seminar speaker this week, Cheryl Balm from Kansas State, is getting in on Wednesday afternoon, but won't be able to stay for dinner after the seminar on Thursday. So I'd like to organize a pre-seminar dinner on Wednesday (time and place to be determined). If you're interested in joining us, let me know. Jesse

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Seminar and weekend conference
by Jesse Johnson 24 Oct '13

24 Oct '13

Dear Topologists and Friends of Topology, Weiping will give the topology seminar this afternoon at 3:30 in MSCS 514. The title is "Systolic Freedom on 3-manifolds". Also, the web page for the Redbud conference this weekend is now up, including a schedule: https://www.math.okstate.edu/~jjohnson/redbud2013/ (Thanks go to Sean for the lovely job making the web page.) Jesse

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Redbud Fall Conference this Saturday (at OSU)
by Jesse Johnson 23 Oct '13

23 Oct '13

Dear Topologists and Friends of Topology, The Fall Redbud conference will be this Saturday, here at OSU. (I announced this at the seminar a few times, though I probably should have sent out some e-mails sooner as well.) I hope to have a web page and schedule up soon. In the mean time, if you plan to attend, please register using the link below. You can attend whether or not you register, but the data from registration will be used to report to the NSF on the success of the conference, which will make it easier for us to renew the funding next year. http://math.uark.edu/6738.php Jesse

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