### TBA by Angela Wu

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, February 20, 2023 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Angela Wu – Lousiana State University – awu@lsu.edu

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- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, February 20, 2023 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Angela Wu – Lousiana State University – awu@lsu.edu

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, February 6, 2023 - 12:30 for 1 hour (actually 50 minutes)
- Location
- Speaker
- Tam Cheetham-West – Rice University – tcw@rice.edu

The finite index subgroups of a finitely presented group generate a topology on the group. We will discuss using examples how this relates to the organization of a group's finite quotients, and introduce the ideas of profinite rigidity and flexibility.

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, December 5, 2022 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Gabriel Islambouli – UC Davis

We show how to obtain a decomposition of an arbitrary closed, smooth, orientable 4-manifold from a loop of Morse functions on a surface or as a loop in the pants complex. A nice feature of all of these decompositions is that they can be encoded on a surface so that, in principle, 4-manifold topology can be reduced to surface topology. There is a good amount to be learned from translating between the world of Morse functions and the world of pants decompositions. We will allude to some of the applications of this translation and point the interested researcher to where they can learn more. No prior knowledge of these fields is assumed and there will be plenty of time for questions.

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, November 14, 2022 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Speaker

We will talk a little about realizing automorphisms of a free group as graph maps and how to use Stallings folds to study them.

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, September 19, 2022 - 13:00 for 1 hour (actually 50 minutes)
- Location
- Speaker
- Abdalrazzaq (Abdul) Zalloum – University of Toronto

A geodesic metric space is said to be CAT(0) if triangles are at most as fat as triangles in the Euclidean plane. A CAT(0) cube complex is a CAT(0) space which is built by gluing Euclidean cubes isometrically along faces. Due to their fundamental role in the resolution of the virtual Haken's conjecture, CAT(0) cube complexes have since been a central object of study in geometric group theory and their study has led to ground-breaking advances in 3–manifold theory. The class of groups admitting proper cocompact actions on CAT(0) cube complexes is very broad and it includes hyperbolic 3-manifolds, most non-geometric 3 manifold groups, small cancelation groups and many others.

A revolutionary work of Sageev shows that the entire structure of a CAT(0) cube complexes is encoded in its hyperplanes and the way they interact with one another. I will discuss Sageev's theorem which provides a recipe for constructing group actions on CAT(0) cube complexes using some very simple and purely set theoretical data.

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, March 22, 2021 - 13:00 for 1 hour (actually 50 minutes)
- Location
- ONLINE
- Speaker
- Tyrone Ghaswala – CIRGET, Université du Québec à Montréal – tyrone.ghaswala@cirget.ca

This pre-talk will be an introduction to infinite-type surfaces and big mapping class groups. I will have a prepared talk, but it will be extremely informal, and I am more than happy to take scenic diversions if the audience so desires!

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, April 20, 2020 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Michelle Chu – University of Illinois at Chicago – michu@uic.edu

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, April 13, 2020 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Maggie Miller – Princeton University – maggiem@math.princeton.edu

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, March 30, 2020 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skile 006
- Speaker
- Anthony Conway – Max Planck Institut für Mathematik – anthonyyconway@gmail.com

- Series
- Geometry Topology Seminar Pre-talk
- Time
- Monday, March 9, 2020 - 12:45 for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Allison Miller – Rice University – allison.miller@rice.edu

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