Previous Conferences & Workshops

Feb
05
2025

Mathematical Conversations

The Unfinished Story of the Mahler Conjecture.
6:00pm|Simons Hall Dilworth Room

The polar body is a fundamental concept in functional and convex analysis, representing a special convex set associated with any convex subset of Euclidean space. One can think of the polar operation as, roughly speaking, the "inverse" of convex...

Feb
05
2025

Workshop on Combinatorics of Enumerative Geometry

Chow Quotients of Toric and Schubert Varieties by $\mathbb{C}^*$-actions
2:30pm|Simonyi Hall 101

Abstract: Chow quotients of projective varieties by affine torus actions provide alternative constructions of interesting geometric objects. For example, the moduli space of stable genus 0 curves with $n$ marked points arises as the Chow quotient of...

Feb
05
2025

Workshop on Combinatorics of Enumerative Geometry

Invariants of Lattice Polytopes and Matroids
Eric Katz
12:00pm|Simonyi Hall 101

Abstract: We will discuss invariants of lattice polytopes and their subdivisions arising from Ehrhart and Hodge theory and introduce their matroid theoretic analogues which are enriched versions of the characteristic and Tutte polynomials.

Feb
05
2025

Workshop on Combinatorics of Enumerative Geometry

Permutahedral Subdivisions and Class Formulas from Coxeter Elements
Melissa Sherman-Bennett
10:00am|Simonyi Hall 101

Abstract: I will discuss some regular subdivisions of the permutahedron, one for each Coxeter element in the symmetric group. These subdivisions are "Bruhat interval" subdivisions, meaning that each face is the convex hull of the permutations in a...

Feb
04
2025

Joint IAS/PU Groups and Dynamics Seminar

Short Curves on Expander Surfaces
Jenya Sapir
4:30pm|314 Fine Hall

We discuss what a "typical" short curve on a random large genus hyperbolic surface looks like. In particular, for each $L$, there are finitely many curves of length at most $L$. We find length scales at which such a curve chosen at random is highly...

Feb
04
2025

Workshop on Combinatorics of Enumerative Geometry

Tropical psi Classes and Tropicalizations of psi Classes
Renzo Cavalieri
4:30pm|Simonyi Hall 101

Abstract: The general rule for the interactions between tropical geometry and moduli spaces of course is the following: everything you may wish is going to work like a charm in genus zero, and break down horribly in higher genus. This is the case...

Feb
04
2025

Workshop on Combinatorics of Enumerative Geometry

Grothendieck Shenanigans: Algebra Meets Integrable Probability
2:30pm|Simonyi Hall 101

Abstract: In his 2018 paper "Some Schubert shenanigans" Richard Stanley asked for the asymptotic behavior of the maximal principle specialization of a Schubert polynomial. Motivated by this, still open, question we explore the generalization to...

Feb
04
2025

Symplectic Geometry Seminar

Spectral Capacity of Symplectic Ellipsoids
Habib Alizadeh
1:00pm|Rubenstein Commons | Meeting Room 5

The spectral norm on the group of Hamiltonian diffeomorphisms of a symplectic manifold is defined via a homological min-max process on the filtered Floer homology. Based on the spectral norm one defines the spectral capacity of domains which is...

Feb
04
2025

Workshop on Combinatorics of Enumerative Geometry

Quilts of Alternating Sign Matrices
Sara Billey
12:00pm|Simonyi Hall 101

Abstract: We present new objects called quilts of alternating sign matrices with respect to two given posets. Quilts generalize several commonly used concepts in mathematics. For example, the rank function on submatrices of a matrix gives rise to a...

Feb
04
2025

Computer Science/Discrete Mathematics Seminar II

Lower Bounds for Local Codes from Induced Subgraphs of Cayley Graphs
10:30am|Rubenstein Commons | Meeting Room 5

We present a new method to solve algorithmic and combinatorial problems by (1) reducing them to bounding the maximum, over x in {-1, 1}^n, of homogeneous degree-q multilinear polynomials, and then (2) bounding the maximum value attained by these...