Events - July 2018

Friday, July 27, 2018 — 3:30 PM EDT

Title: Algorithms for Rank-1 Bimatrix Games

Speaker: Bernhard von Stengel
Affiliation: London School of Economics
Room: MC 5501

Abstract:

The rank of a bimatrix game is the matrix rank of the sum of the two payoff matrices.

Thursday, July 26, 2018 — 3:30 PM EDT

Title: Acyclic Colouring of Graphs on Surfaces

Speaker: Shayla Redlin
Affiliation: University of Waterloo
Room: MC 5479

Abstract: An acyclic k-colouring of a graph G is a proper k-colouring of G with no

Friday, July 20, 2018 — 3:30 PM EDT

Title: Claw-free matroids

Speaker: Peter Nelson
Affiliation: University of Waterloo
Room: MC 5501

Abstract: A simple binary matroid is claw-free if it has no independent rank-3 flat. I will discuss a structure theorem, obtained jointly with Kazuhiro Nomoto, that classifies these objects exactly.

Thursday, July 19, 2018 — 3:30 PM EDT

Title: Density and Structure of Homomorphism-Critical Graphs

Speaker: Evelyne Smith-Roberge
Affiliation: University of Waterloo
Room: MC 5417

Abstract: 

Let H be a graph. A graph G is H-critical if every proper subgraph of G admits a homomor-
phism to H, but G itself does not.

Tuesday, July 17, 2018 — 3:00 PM EDT

Title: Using Linear Algebra to do Matching Theory

Speaker: Justin Toth
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

A matching in a graph is a set of edges with each vertex contained in at most one edge. A perfect matching is a matching in which each vertex is contained in some edge.

Thursday, July 12, 2018 — 3:30 PM EDT

Title: Gaps in the crossing numbers of drawings of the complete graph

Speaker: Bruce Richter
Affiliation: University of Waterloo
Room: MC 5479

Abstract: In the late 1990’s, a 5-author manuscript circulated proving the existence of intervals of integers that connot occur as the crossing number of a “good” drawing of the complete graph. 

Thursday, July 12, 2018 — 1:30 PM EDT

Title: Periodicity on Oriented Graphs by way of Transcendental Number Theory

Speaker: Sabrina Lato
Affiliation: University of Waterloo
Room: MC 6486

Abstract: Using the adjacency matrix of a graph, it is straightforward to show that perfect state transfer between two vertices at some time t implies that both vertices will be periodic at time 2t.

Friday, July 6, 2018 — 3:30 PM EDT

Title: The coloring problem for restricted graph classes

Speaker: Chinh T. Hoang
Affiliation: Wilfred Laurier University
Room: MC 5501

Abstract:

Let L be a set of graphs. Free(L) is the set of graphs that do not contain any graph in L as an induced subgraph.

Thursday, July 5, 2018 — 3:30 PM EDT

Title:Generalizing the problem of packing disjoint cycles

Speaker: Paul Wollan
Affiliation: University of Rome "La Sapienza"
Room: MC 5479

Abstract: A classic result of Erdos and Posa states that there exists a function f such that for all k,

Thursday, July 5, 2018 — 1:30 PM EDT

Title: Edge State Transfer

Speaker: Tina Chen
Affiliation: University of Waterloo
Room: MC 6486

Abstract: Most research about quantum state transfer on graphs use adjacency matrices as their Hamiltonians and investigate the transfers between single vertex states.

S M T W T F S
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
  1. 2019 (129)
    1. September (15)
    2. August (9)
    3. July (17)
    4. June (18)
    5. May (16)
    6. April (9)
    7. March (24)
    8. February (13)
    9. January (8)
  2. 2018 (138)
    1. December (2)
    2. November (18)
    3. October (14)
    4. September (9)
    5. August (2)
    6. July (10)
    7. June (13)
    8. May (17)
    9. April (9)
    10. March (19)
    11. February (14)
    12. January (11)
  3. 2017 (103)
  4. 2016 (137)
  5. 2015 (136)
  6. 2014 (88)
  7. 2013 (48)
  8. 2012 (39)
  9. 2011 (36)
  10. 2010 (40)
  11. 2009 (40)
  12. 2008 (39)
  13. 2007 (15)