# Zoom

### Algebra/Topology Seminar – Austin Christian (Georgia Tech)

ZoomTitle: Symplectic fillings of lens spaces Abstract: Many contact 3-manifolds arise as boundaries of symplectic 4-manifolds, and we are often interested in the filling problem for a given contact 3-manifold. That is, how many symplectic 4-manifolds have the given contact boundary? This problem has previously been solved for standard contact structures on lens spaces. We use

### AWM Seminar – Nick Michalowski-Longo (MathWorks)

ZoomNick Michalowski-Longo of MathWorks is giving the department talk tomorrow from 11:00 - 12:15 pm. (via Zoom). We would like to encourage you to attend his talk and stay afterwards for the more informal discussion.

### Analysis Seminar – Walton Green (Washington University)

ZoomTitle: Wavelet Representation of Smooth Calderón-Zygmund Operators Abstract: We represent a bilinear Calderón-Zygmund operator at a given smoothness level as a finite sum of cancellative, complexity zero operators, involving smooth wavelet forms, and continuous paraproduct forms. This representation results in a sparse T(1)-type bound, which in turn yields directly new sharp weighted linear and mutlilinear

### Colloquium – David Goldberg (Math Alliance, Purdue University)

ZoomAbstract: The National Alliance for Doctoral Studies in the Mathematical Sciences, more commonly known as the Math Alliance, grew out of an earlier NSF Funded project, The Alliance for the Production of African American PhDs in the Mathematical Sciences. In 2006 this project transformed itself to have a national scope, and it has been growing

### Algebra/Topology Seminar – Surena Hozoori (Georgia Tech)

ZoomTitle: On Anosovity, divergence and bi-contact surgery Abstract: I will revisit the relation between Anosov 3-flows and invariant volume forms, from a contact geometric point of view. Consequently, I will give a contact geometric characterization of when a flow with dominated splitting is Anosov based on its divergence, as well as a Reeb dynamical interpretation

### Analysis Seminar – David Cruz-Uribe (University of Alabama)

ZoomTitle: Matrix weights, the convex-set valued maximal operator, and Rubio de Francia extrapolation part 4. Abstract: In this series of talks, I want to talk about the theory of matrix weights: its history and motivation, and some recent results by myself, Kabe Moen, and others. The ultimate goal is to give an overview of my

### Algebra/Topology Seminar – Jonathan Simone (Georgia Institute of Technology)

ZoomTitle: The non-orientable 4-ball genus of torus knots Abstract: The non-orientable 4-ball genus of a knot $K$ in $S^3$ is the minimal first Betti number of any smoothly embedded non-orientable surface in $B^4$ bounded by K. This is the non-orientable analog of the 4-ball genus of $K$ (i.e. the minimal genus of any smooth orientable surface

### Analysis Seminar – David Cruz-Uribe (University of Alabama)

ZoomTitle: Matrix weights, the convex-set valued maximal operator, and Rubio de Francia extrapolation part 3. Abstract: In this series of talks, I want to talk about the theory of matrix weights: its history and motivation, and some recent results by myself, Kabe Moen, and others. The ultimate goal is to give an overview of my

### Colloquium – Rosa Orellana (Dartmouth College)

ZoomTITLE: Products of characters of the symmetric group ABSTRACT: One of the main open problems in combinatorial representation theory of the symmetric group is to obtain a combinatorial interpretation for what are known as the Kronecker coefficients. The Kronecker coefficients are obtained when we decompose the tensor product of two irreducible representations of the symmetric

### Analysis Seminar – David Cruz-Uribe (University of Alabama)

ZoomTitle: Matrix weights, the convex-set valued maximal operator, and Rubio de Francia extrapolation part 2. Abstract: In this series of talks (I project three), I want to talk about the theory of matrix weights: its history and motivation, and some recent results by myself, Kabe Moen, and others. The ultimate goal is to give an