# Seminars and colloquia

E.g., Jan. 29, 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

### 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

### Neha Malik

Indian Institute of Science Education and Research
Stiefel-Whitney Classes of Representations of Some Finite Groups of Lie Type

February 9, 2022

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

Orthogonal representations $\pi$ of a finite group $G$ have invariants $w_i(\pi)$ living in the $i$th degree cohomology group $H^i(G,Z/2Z)$, called Stiefel-Whitney Classes (SWCs). The sum $w(\pi)=1+w_1(\pi)+w_2(\pi)+\dots$ is called the total SWC of $\pi$. It seems there are ... Read more
• Topology

### Toni Annala

UBC
Topology Seminar - TBA

February 16, 2022

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

• Topology

### Jim Bryan

UBC
Topology Seminar - TBA

February 23, 2022

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

• Topology

### Peter Kropholler

University of Southampton
TBA

March 28, 2022

• Topology