# Seminars and colloquia

E.g., Jan. 28, 2022

### Antonio Alfieri

UQAM
Heegaard Floer invariants of webs, two components links, and strongly invertible knots.

January 28, 2022

https://ubc.zoom.us/j/63532469289?pwd=b0RJYi9oOHAxRTY1QW5BOEdnMUU5Zz09

I will outline the construction of numerical invariants of embedded webs based on Heegaard Floer homology. This is motivated by some questions regarding the four-dimensional topology of strongly invertible knots, embedded theta-shaped graphs, and linking number zero two- ... Read more
• Topology

### Farid Aliniaeifard

UBC
Modular relations between chromatic symmetric functions

February 1, 2022

Zoom - https://ubc.zoom.us/j/62676242229?pwd=RURtUC9UYXEweVZTMTNGT1EvY1FLZz09

In 1995, Stanley introduced the chromatic symmetric functions. The study of chromatic symmetric functions of graphs inspired two main research directions. The first research direction is to prove the Stanley-Stembridge conjecture: if a poset is $(3+1)$-free, then the chromatic ... Read more
• Discrete mathematics

### Alexander Sivatski

Universidade Federal do Rio Grande do Norte
Nonstandard quadratic forms over rational function fields

February 2, 2022

• Algebra and Algebraic geometry

### Gal Kronenberg

University of Oxford
Independent sets in random subgraphs of the hypercube

February 2, 2022

The number of independent sets in the hypercube {0,1}^d was estimated precisely by Korshunov and Sapozhenko in the 1980s and recently refined by Jenssen and Perkins. In this talk we will discuss new results on the number of independent sets in a random subgraph of the ... Read more
• Probability

Fred Bauer Minisymposium

February 2, 2022

Zoom - contact Katie Faulkner for link

• Mathematical Biology

### Kelly Isham

Colgate University
Zeta functions and asymptotics related to subrings in $\mathbb{Z}^n$

February 2, 2022

1984 Mathematics Rd

We can define a zeta function of a group (or ring) to be the Dirichlet series associated to the sequence that counts the number of subgroups (or subrings) of a given index. The subgroup zeta function over $\mathbb{Z}^n$ is well-understood, as is the asymptotic growth of ... Read more
• Number Theory

### Cihan Okay

Bilkent University
Simplicial techniques in quantum foundations

February 2, 2022

ESB 4133

Probability distributions produced by quantum measurements are more general than the ones produced by classical measurements. This is due to the fact that only commuting observables, for example represented by a set of commuting unitaries, can be simultaneously measured. ... Read more
• Topology

### Daniel Massatt

University of Chicago
PIMS/UBC Rising Stars Colloquium

February 4, 2022

1984 Mathematics Rd

### Hemanshu Kaul

Illinois Institute of Technology
Chromatic polynomial and counting DP-colorings of graphs : Problems and progress

February 8, 2022

Zoom - https://ubc.zoom.us/j/62676242229?pwd=RURtUC9UYXEweVZTMTNGT1EvY1FLZz09

In 1912, Birkhoff, introduced the chromatic polynomial of a graph G that counts the number of proper colorings of G. List coloring, introduced in the 1970s by Erdos among others, is a natural generalization of ordinary coloring where each vertex has a restricted list of colors ... Read more
• Discrete mathematics

### Frédéric Paquin-Lefebvre

École Normale Supérieure de Paris
Math Bio Seminar - Paquin-Lefebvre

February 9, 2022

Zoom - contact Katie Faulkner for link

• Mathematical Biology