# Events

### Matroid Theory Seminar - Jim Geelen

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

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.

### Algebraic Graph Theory - Krystal Guo

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

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.

### Algebraic Graph Theory - Krystal Guo

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

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.

### Algebraic Combinatorics Seminar- Christin Bibby

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

Title: Representation stability for the cohomology of arrangements

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

Tuesday, March 22, 2016 — 4:15 PM EDT

Title: Gallai's path decomposition conjecture

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

Monday, March 21, 2016 — 4:30 PM EDT

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!

### Tutte Colloquium - Jim Geelen

Friday, March 18, 2016 — 3:30 PM EDT

Title: Recognizing frame matroids

### Matroid Theory Seminar - Peter Nelson

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

Title: The matroid secretary problem for minor-closed classes

### Algebraic Combinatorics Seminar- Eric Katz

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

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

### C&O Reading Group - Xingliang David Lou

Monday, March 14, 2016 — 4:30 PM EDT

Title: Principal angles and vectors of two subspaces

### Tutte Colloquium - Iian Moffatt

Friday, March 11, 2016 — 3:30 PM EST

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

### Graph Theory Seminar - Ahmad Abdi

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

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.

### Algebraic Graph Theory - Krystal Guo

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

Title: Strongly regular subconstituents of strongly regular graphs

### Algebraic Combinatorics - Carolina Benedetti

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

Title: Hopf algebras, colorings and simplicial complexes

Monday, March 7, 2016 — 4:30 PM EST

Title: The perfect matching polytope and solid graphs

### Tutte Colloquium - Gerard Cornuejols

Friday, March 4, 2016 — 3:30 PM EST

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

### Matroid Theory Seminar - Tony Huynh

Thursday, March 3, 2016 — 4:00 PM EST

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

### Algebraic Graph Theory - Krystal Guo

Thursday, March 3, 2016 — 3:00 PM EST

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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