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# Events for 11/06/2020 from all calendars

## Student Working Seminar in Groups and Dynamics

## Spectral Theory Reading Seminar

## Mathematical Physics and Harmonic Analysis Seminar

## Algebra and Combinatorics Seminar

## Open Teaching with Technology Forum

## Student/Postdoc Working Geometry Seminar

**Time: ** 11:00AM - 12:00PM

**Location: ** Zoom

**Speaker: **Konrad Wrobel

**Title: ***Cofinite equivariance and wreath products*

**Abstract: **We show all wreath products of cyclic groups with a given free group as the base space are orbit equivalent. In order to show this, we define the notion of a cofinitely equivariant and study how this property is preserved under free products. This is joint work with Robin Tucker-Drob.

**Time: ** 11:00AM - 11:50AM

**Location: ** Zoom

**Speaker: **Rodrigo Matos, TAMU

**Title: ***Shnol's Theorem*

**Time: ** 1:50PM - 2:50PM

**Location: ** Zoom

**Speaker: **Mengxuan Yang, Northwestern

**Title: ***Wave Diffraction on Cones and The Aharonov-Bohm Effect*

**Abstract: **Hormander's classic theorem shows the singularities of solutions to the wave equation propagate along the geodesic flow. This is generalized by Cheeger-Taylor and Melrose-Wunsch to manifolds with conic singularities, where the singularities propagate along the so-called diffractive geodesics. In this talk, we will discuss the finer structure of the diffractive wave on cones as well as propagation of singularities for the wave equation with a singular magnetic Laplacian. This latter equation, closely analogous to wave equations with conic singularities, is the setting of the celebrated Aharonov-Bohm effect.

**Time: ** 3:00PM - 4:00PM

**Location: ** Zoom

**Speaker: **Lauren Snider, Texas A&M

**Title: ***On 2-dimensional parking functions*

**Abstract: **A 2-dimensional U-parking function is a pair of integer sequences whose order statistics are bounded by certain weights along lattice paths in the plane. U-parking functions are natural higher-dimensional generalizations of classical parking functions. Other interesting generalizations include (p,q)-parking functions (Cori and Poulalhon) and graphical parking functions (Postnikov and Shapiro) . In this talk, we will show that (p,q)-parking functions are in fact U-parking functions for a particular node-set U, as well as explicitly describe the overlap between U-parking functions and graphical parking functions when U is affine. Along the way, we will discuss some results regarding the enumeration of increasing U-parking functions. This is based on joint work with Catherine Yan.

**Time: ** 3:30PM - 5:00PM

**Location: ** Zoom

**Speaker: **Vanessa Coffelt

**Description: **Join Zoom Meeting: https://tamu.zoom.us/j/93142718312?pwd=c2x5Zm5RZWdheEJ4SU40N3VYMlFpdz09 Meeting ID: 931 4271 8312

**Time: ** 10:00PM - 11:00PM

**Location: ** zoom

**Speaker: **JM Landsberg, TAMU

**Title: ***Mukai: moduli of rank 2 vector bundles on curves I*