Events tagged with webnotice

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.

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