Contact Info
Combinatorics & Optimization
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1
Phone: 519-888-4567, ext 33038
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Tuesday, May 24, 2022 — 9:00 AM to Friday, May 27, 2022 — 4:30 PM EDT
A celebration of Goulden and Jackson's combined 90 years of insight and inspiration that have shaped the fields of algebraic and combinatorial enumeration.
Registration
To register, click here.
Thursday, May 26, 2022 — 11:30 AM EDT
Title: Faster Algorithms for Isogeny Problems using Torsion Point Images.
| Speaker: | Dinesh Valluri |
| Affiliation: | University of Waterloo |
| Attend: | Contact Jesse Elliott |
Abstract:
In this talk, we will discuss cryptanalysis of some SIDH-type protocols due to Christophe Petit: https://eprint.iacr.org/2017/571.pdf. While finding isogenies between supersingular elliptic curves remains computationally hard to solve, knowledge of images of specific torsion points by the unknown isogeny helps build faster attacks.
Friday, May 27, 2022 — 3:30 PM EDT
Title: Early Work
| Speaker: | Ian Goulden |
| Affiliation: | University of Waterloo |
| Location: | QNC 0101 or please contact Emma Watson for Zoom link |
Abstract:
I will talk briefly and informally about my work in the last century.
Title: At It and In It
| Speaker: | David Jackson |
| Affiliation: | University of Waterloo |
| Location: | QNC 0101 or please contact Emma Watson for Zoom link |
Abstract:
I have selected seven Research Themes to talk about very briefly and informally. They are reflections upon key moments and surprising revelations over the past forty years.
Monday, May 30, 2022 — 11:30 AM EDT
Title: An overview of complex unit gain graphs and their spectra
| Speaker: |
Aniruddha Samanta |
| Affiliation: |
Indian Statistical Institute Bangalore |
| Zoom: | Contact Sabrina Lato for link |
Abstract:
In this talk, we will study complex unit gain graphs via the spectra of various classes of matrices associated with them. A complex unit gain graph (or T-gain graph), Φ = (G, φ) is a graph where the function φ assigns a unit complex number to each orientation of an edge of G, and its inverse is assigned to the opposite orientation. We will give an overview of several spectral properties of T-gain graphs.
Tuesday, May 31, 2022 — 2:30 PM EDT
Title: Colouring binary matroids
| Speaker: | Jim Geelen |
| Affiliation: | University of Waterloo |
| Room: | MC 5417 |
Abstract:
I will give an introduction to critical number for binary matroids and will discuss two of my favourite conjectures on the topic. No prior knowledge of matroids will be assumed.
Thursday, June 2, 2022 — 12:00 PM EDT
Title: Cyclic sieving with focus on open problems
| Speaker: |
Per Alexandersson |
| Affiliation: |
Stockholm University |
| Room/Zoom: | MC5479 or for Zoom link contact Logan Crew or Olya Mandelshtam |
Abstract:
The cyclic sieving phenomenon (CSP) connects a cyclic group action on a family of combinatorial objects with some q-analog of that set. We discuss some recent results and open problems for standard and semistandard tableaux, as well as some other families of combinatorial objects.
Several open problems with various levels of difficulty will be presented.