| Date: | February 4, 2019 |
| Time: | 2:00pm |
| Location: | BLOC 628 |
| Speaker: | Nicolas Matte Bon, ETH Zurich |
| Title: | An introduction to group actions on the circle be homeomorphism |
|
| Date: | March 1, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 246 |
| Speaker: | James O'Quinn |
| Title: | The Ornstein-Weiss Quasitiling Theorem |
| Abstract: | The Ornstein-Weiss Quasitiling Theorem roughly states that
approximately invariant finite subsets of a group can almost be tiled by
translates of finitely many subsets of the group with nice invariance
properties. I will discuss the ideas behind this theorem and give a
proof for it. |
|
| Date: | March 8, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 506A |
| Speaker: | Krzysztof Święcicki |
| Title: | Some remarks on FLp actions |
| Abstract: | I will discuss property FLp - an analog of property (T). I'll sketch an argument that property (T) implies measure preserving property FLp. Based on a work in progress with Alan Czuron.
|
|
| Date: | March 22, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 506A |
| Speaker: | Alex Weygandt |
| Title: | A crash course in operator K-Theory |
| Abstract: | Operator K-Theory is a pair of functors, associating to each
C^*-algebra A a pair of abelian groups K_0(A) and K_1(A), containing
information about the structure of A. In this talk, I will show how
these groups are constructed, some basic computational tools, and (time
permitting) the calculation of K-groups of C*-algebras associated to
groups and dynamics. |
|
| Date: | April 5, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 605AX |
| Speaker: | James O'Quinn |
| Title: | The Ornstein-Weiss Quasitower theorem and an application |
|
| Date: | April 12, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 506A |
| Speaker: | Amanda Hoisington |
| Title: | Coarse embeddings under group extensions |
| Abstract: | I will be going over a paper by Arzhantseva and Tessera (2017)
which proves, by construction, that admitting a coarse embedding into
Hilbert space is not preserved under group extension." |
|
| Date: | April 26, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 506A |
| Speaker: | Konrad Wrobel |
| Title: | Mixing Properties and Comeager Subsets of Act(G,X,\mu) |
| Abstract: | One of the early results in measurable dynamics, due to Halmos, is the fact that ergodic transformations form a comeager subset of the set of Aut(X,\mu). I will discuss several similar results when the group acting is not $\mathbb{Z}$. In particular, I will be concerned with groups that have property (T) or the Haagerup Approximation Property. |
|
| Date: | May 8, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 506A |
| Speaker: | Justin Cantu |
| Title: | Thin Orbital Graphs and Periodic Groups |
| Abstract: | I will discuss the periodicity for some finitely generated groups of homeomorphisms of a Cantor set with certain dynamical properties, and give examples if time allows. |
|
| Date: | May 15, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 624 |
| Speaker: | Konrad Wrobel |
| Title: | Amalgamated Free Products |
|
| Date: | May 22, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 624 |
| Speaker: | Jintao Deng |
| Title: | Trees |
|
| Date: | May 24, 2019 |
| Time: | 3:00pm |
| Location: | BLOC 624 |
| Speaker: | Alex Weygandt |
| Title: | Trees and Free Groups |
|
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