# Events

Thursday, March 31, 2016 — 4:00 PM EDT

## Matroid Theory Seminar - Jim Geelen

Title: Presenting a tangle

 Speaker: Jim Geelen Affiliation: University of Waterloo Room: MC 5417

Abstract: A tangle of order $k$ in a matroid is an abstract notion that describes a “$k$-connected component” of a matroid. Tangles are very useful in theoretical applications, but in practice they suffer from being difficult to describe succinctly. In this talk we try to address that issue and present some negative results.

Thursday, March 31, 2016 — 3:00 PM EDT

## Algebraic Graph Theory - Krystal Guo

Title: Arc-transtive cubic graphs

 Speaker: Krystal Guo Affiliation: University of Waterloo Room: MC 6486

Abstract: We will look at a classical result of Tutte in his seminal paper "A Family of Cubic Graphs"; every cubic arc-transitive graph is s-arc-regular for some s between 1 and 5.

Thursday, March 31, 2016 — 3:00 PM EDT

## Algebraic Graph Theory - Krystal Guo

Title: Arc-transtive cubic graphs

 Speaker: Krystal Guo Affiliation: University of Waterloo Room: MC 6486

Abstract: We will look at a classical result of Tutte in his seminal paper "A Family of Cubic Graphs"; every cubic arc-transitive graph is s-arc-regular for some s between 1 and 5.

Thursday, March 24, 2016 — 2:00 PM EDT

## Algebraic Combinatorics Seminar- Christin Bibby

Title: Representation stability for the cohomology of arrangements

Tuesday, March 22, 2016 — 4:15 PM EDT

## Graph Theory Seminar - Marthe Bonamy ** NOTE Change in Time**

Title: Gallai's path decomposition conjecture

Monday, March 21, 2016 — 4:30 PM EDT

## C&O Reading Group - Gabriel Gauthier-Shalom

Title: The mathematics of juggling

 Speaker: Gabriel Gauthier-Shalom Affiliation: University of Waterloo Room: MC 6486

Abstract: Siteswap is a mathematical notation for juggling patterns that is
natural, simple, and useful in practice. I will be presenting an overview of
this topic and its connections with other areas of mathematics. There will be demonstrations!

Friday, March 18, 2016 — 3:30 PM EDT

## Tutte Colloquium - Jim Geelen

Title: Recognizing frame matroids

Thursday, March 17, 2016 — 4:00 PM EDT

## Matroid Theory Seminar - Peter Nelson

Title: The matroid secretary problem for minor-closed classes

Thursday, March 17, 2016 — 2:00 PM EDT

## Algebraic Combinatorics Seminar- Eric Katz

Title: McMullen's proof of the g-theorem for polytonal spheres

Monday, March 14, 2016 — 4:30 PM EDT

## C&O Reading Group - Xingliang David Lou

Title: Principal angles and vectors of two subspaces

Friday, March 11, 2016 — 3:30 PM EST

## Tutte Colloquium - Iian Moffatt

Title: Graphs are to matroids as embedded graphs are to what?

Thursday, March 10, 2016 — 4:30 PM EST

## Graph Theory Seminar - Ahmad Abdi

Title: The replication conjecture II

 Speaker: Ahmad Abdi Affiliation: University of Waterloo Room: MC 5417

Abstract: In 1993, Conforti and Cornuejols conjectured that replicating the vertex of a clutter preserves the packing property. I will present some tools that will be helpful in tackling this conjecture. The upshot is to take advantage of the fact that clutters with the packing property exclude delta minors, as well as some other small minors.

Thursday, March 10, 2016 — 3:00 PM EST

## Algebraic Graph Theory - Krystal Guo

Title: Strongly regular subconstituents of strongly regular graphs

Thursday, March 10, 2016 — 2:00 PM EST

## Algebraic Combinatorics - Carolina Benedetti

Title: Hopf algebras, colorings and simplicial complexes

Monday, March 7, 2016 — 4:30 PM EST

Title: The perfect matching polytope and solid graphs

Friday, March 4, 2016 — 3:30 PM EST

## Tutte Colloquium - Gerard Cornuejols

Title: On some polytopes contained in the 0,1 hypercube that have a small
chvatal rank

Thursday, March 3, 2016 — 4:00 PM EST

## Matroid Theory Seminar - Tony Huynh

Title: A unified Erd\H os-P\'osa theorem for constrained cycles

Thursday, March 3, 2016 — 3:00 PM EST

## Algebraic Graph Theory - Krystal Guo

Title: Introduction to association schemes

 Speaker: Krystal Guo Affiliation: University of Waterloo Room: MC 6486

Abstract: The theory of association schemes is an important toolbox for algebraic graph theory. We will give an introduction to association scheme, distance regular graphs and the clique-coclique bound.

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