University COVID-19 update

The University of Waterloo is constantly updating our most Frequently Asked Questions.

Questions about buildings and services? Visit the list of Modified Services.

Please note: The University of Waterloo is closed for all events until further notice.

Events by month

May 2021

Sun Mon Tue Wed Thu Fri Sat
25
26
27
28
29
30
1
 
 
 
 
 
 
 
2
3
4
5
6
7
8
 
 
 
 
 
 
 
9
10
11
12
13
14
15
 
 
 
 
 
16
17
18
19
20
21
22
 
 
 
 
23
24
25
26
27
28
29
 
 
 
 
 
 
30
31
1
2
3
4
5
 
 
 
 
 
 
Monday, May 10, 2021 — 11:30 to 11:30 AM EDT

Title: Quantum independence number

Speaker: Mariia Sobchuk Affiliation: University of Waterloo Zoom: Contact Soffia Arnadottir

Abstract:

From this talk you will be able to learn what quantum independence number is and how it is different from the classical independence number. I will provide both known individual and infinite families of the graphs where classical and quantum independent numbers are different, as well as some of our generalisations of these examples.  

Friday, May 14, 2021 — 3:30 PM EDT

Title: Interlacing methods in Extremal Combinatorics

Speaker: Hao Huang Affliliation: Emory University Zoom: Contact Emma Watson

Abstract:

Extremal Combinatorics studies how large or how small a collection of finite objects could be, if it must satisfy certain restrictions. In this talk, we will discuss applications of spectral graph theory, more specifically eigenvalue interlacing, to prove various interesting results in Extremal Combinatorics. We will discuss the Erdos-Ko-Rado Theorem and its degree version, an isodiametric inequality for discrete cubes, and the resolution of a thirty-year-old open problem in Theoretical Computer Science, the Sensitivity Conjecture of Nisan and Szegedy. Several open problems will also be mentioned during this talk.

Monday, May 17, 2021 — 11:30 PM EDT

Title: Minimum eigenvalue of nonbipartite graphs

Speaker: Bojan Mohar Affiliation: Simon Fraser University Zoom: Contact Soffia Arnadottir

Abstract:

Let \rho and \lambda be the largest and the smallest eigenvalue of a connected graph G. It is well-known that \rho + \lambda \geq 0 and that equality occurs if and only if G is bipartite. The speaker will discuss what else can we say when G is not bipartite.

Thursday, May 20, 2021 — 1:00 PM EDT

Title: q-Whittaker functions, finite fields, and Jordan forms

Speaker: Steven Karp Affiliation: UQAM Zoom: Contact Steve Melczer

Abstract:

The q-Whittaker symmetric function associated to an integer partition is a q-analogue of the Schur symmetric function. We give a new formula for the q-Whittaker function in terms of partial flags compatible with a nilpotent endomorphism over the finite field of size 1/q.

Friday, May 21, 2021 — 3:30 PM EDT

Title: Positivity Problems for Linear Recurrences

Speaker: Steve Melczer Affliliation: University of Waterloo Zoom: Contact Emma Watson

Abstract:

Although sequences satisfying linear recurrence relations have been studied for centuries, and appear as some of the first examples of combinatorial sequences encountered in an introductory combinatorics class, there are natural examples of simply stated problems related to their basic behaviour whose decidability is unknown. In this talk we survey some open computability and complexity questions related to the positivity of linearly recurrent sequences, before examining a new approach to proving positivity using rigorous numerical methods for functions satisfying linear differential equations.

Friday, May 28, 2021 — 3:30 PM EDT

Title: Algebraic formulations of Zauner's conjecture

Speaker: Jon Yard Affliliation: University of Waterloo Zoom: Contact Emma Watson

Abstract:

Tight complex projective 2-designs are simultaneously maximal sets of equiangular lines and minimal complex projective 2-designs. In quantum information theory, they define optimal measurements known as SIC-POVMs (Symmetric Informationally Complete Positive Operator-Valued Measures).  They are conjectured by Zauner to exist in every dimension, even as specific group orbits. 

Monday, May 31, 2021 — 11:30 to 11:30 AM EDT

Title: An algebraic framework for twualities of embedded graphs

Speaker: Jo Ellis-Monaghan Affiliation: Korteweg-de Vries Instituut voor Wiskunde, Universiteit van Amsterdam Zoom: Contact Soffia Arnadottir

Abstract:

We develop algebraic tools to identify and generate new surface embeddings of graphs with various forms of self-twuality including geometric duality, Petrie duality, Wilson duality, and both forms of triality (which is like duality, but of order three instead of two).  These operations are of particular interest because of their interplay with graph symmetries and graph polynomials.

S M T W T F S
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
2
3
4
5
  1. 2021 (58)
    1. June (11)
    2. May (7)
    3. April (9)
    4. March (13)
    5. February (8)
    6. January (10)
  2. 2020 (119)
    1. December (5)
    2. November (12)
    3. October (12)
    4. September (12)
    5. August (11)
    6. July (17)
    7. June (11)
    8. May (6)
    9. March (11)
    10. February (11)
    11. January (11)
  3. 2019 (167)
  4. 2018 (136)
  5. 2017 (103)
  6. 2016 (137)
  7. 2015 (136)
  8. 2014 (88)
  9. 2013 (48)
  10. 2012 (39)
  11. 2011 (36)
  12. 2010 (40)
  13. 2009 (40)
  14. 2008 (39)
  15. 2007 (15)