Mdtop

mdtop@mathdept.okstate.edu

247 discussions

Hempel/3-Manifolds
by Pavelescu, Andrei 24 Mar '14

24 Mar '14

Hello Topologists and Friends Thereof, I need to take a look at the following book: “3-Manifolds” by John Hempel. It is checked out of the library. I wonder if I could borrow it for a day. Best, Andrei Pavelescu

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Hempel/3-Manifolds
by Pavelescu, Andrei 24 Mar '14

24 Mar '14

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ride to Redbud
by Sean Bowman 12 Mar '14

12 Mar '14

Dear friends, I am driving to the Redbud conference the evening of April 11 and returning sometime after the talks are finished on April 13th. Note that I will not be arriving in time for the talks on Friday afternoon. I have an extra two spots in my car, let me know if you'd like a ride! best regards, Sean

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Topology Seminar 3:30pm Thursday
by Henry Segerman 12 Mar '14

12 Mar '14

Dear topologists and friends of topology, Ahmad Issa (University of Texas at Austin) will give the topology seminar at 3:30pm on Thursday. Title: Non-geometric veering triangulations Abstract: In 2010 Ian Agol introduced a class of "veering" ideal triangulations for mapping tori of pseudo-Anosov homeomorphisms of surfaces punctured along the singular points of the invariant foliations. These triangulations have very special combinatorial properties, and Agol asked if these are "geometric", i.e. realised in the complete hyperbolic metric with all tetrahedra positively oriented. In this talk I'll describe Agol's elegant construction of these triangulations using train tracks on surfaces, and give the first examples of non-geometric veering triangulations.

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Topology Seminar Thursday
by Odonnol, Danielle Odonnol 05 Mar '14

05 Mar '14

Hello Topologist and Friends of Topology, We are please to have Topology Seminar this Thursday (MSCS 514 at 3:30) given by Maggy Tomova form The University of Iowa. Title: Obtaining topological information from knot diagrams Abstract: Knots and links are most easily visualized via a projection diagram. However, obtaining topological and geometric information from such a presentation has proven to be difficult. In this talk I will discuss conditions on the diagram that allow us to show that any closed essential surface in the knot complement has high genus. This is joint work with Ryan Blair and David Futer.

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Redbud spring conference
by Henry Segerman 03 Mar '14

03 Mar '14

Dear topologists and friends of topology, The Redbud Topology conference will be April 11-13 at the University of Oklahoma. http://www.math.ou.edu/redbud/ It's time to register for the conference and make hotel arrangements. The plan is for partial support for graduate students and junior researchers. The deadline for full support consideration is March 14th. The budget is going to be tight, so we are asking graduate students to share hotel rooms, and we should of course carpool if possible. Note that the Friday afternoon talks (April 11) are meant for a graduate student audience, so we hope students will be able to come for that. These talks will begin at 2:30 pm, so it should be possible to drive over that day. If you are planning to attend, please let me know so we can plan carpooling etc. Henry

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Topology Seminar Thursday
by Odonnol, Danielle Odonnol 24 Feb '14

24 Feb '14

Hello Topologist and Friends, We are please to have Topology Seminar this Thursday (MSCS 514 at 3:30) given by Jeremy Van Horn-Morris form University of Arkansas. Title: A survey of the mapping class group in contact and symplectic topology Abstract: The past roughly twenty years in the study of contact 3-manifolds and symplectic 4-manifolds has been strongly influenced by work of Donaldson, Gompf and Giroux. These tools encode the differential geometric, and differential topological information coming from a contact or symplectic structure through the topological structure of an open book decomposition -- that is, a nicely fibered link. Many interesting properties of a contact structure are detectable in the monodromy maps of these fibrations. We'll introduce some of these properties (such as tight, and fillable) and connect their monodromy characterizations to properties of mapping classes previously studied in topology, and survey some of the recent applications and current interesting questions.

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Topology Seminar Thursday the 20th
by Odonnol, Danielle Odonnol 17 Feb '14

17 Feb '14

Hello Topologists and Friends of Topology, We will have a seminar this Thursday (MSCS 514 at 3:30) given by our very own Trent Schirmer. Title: Splittings of 3-manifolds versus splittings of groups. Abstract: Recent work of mine and Jesse's has shown that "high distance" free decomposing surfaces properly embedded in 3-manifolds with non-empty boundary exert considerable control over the appearance of other incompressible surfaces and Heegaard splittings in the manifold. These incompressible surfaces induce presentations of the fundamental group of the three manifold as a free product amalgamated over a subgroup whose word length is ``persistently" large with respect to a minimal generating set of each of the factors. I discuss the meaning of this.

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No Seminar this Thrusday
by Odonnol, Danielle Odonnol 10 Feb '14

10 Feb '14

Hello Topologists and Friends, There will be no Topology Seminar this week. There is a Thursday Colloquium. Cheers, Danielle

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Topology Seminar: Change of speaker this Thursday
by Odonnol, Danielle Odonnol 05 Feb '14

05 Feb '14

Hello Topologist and Friends, Shelly Harvey has cancelled her visit, due to illness. Henry has graciously offered to speak. We will have a seminar this Thursday (MSCS 514 at 3:30) given by our own Henry Segerman. Title: Structure on the set of triangulations

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