# Events

### Joint Colloquium Pure Math and C&O - John Baez

Friday, February 26, 2016 — 3:30 PM EST

Title: My favorite number

Speaker: John Baez Affiliation: University of California, Riverside Room: DC 1302

Abstract: The number 24 plays a central role in mathematics thanks to a series of "coincidences" that is just beginning to be understood. One of the first hints of this fact was Euler's bizarre "proof" that

1\^ + 2\^ + 3\^ + 4\^ + … = -1/12\^

### Graph Theory Seminar - Ahmad Abdi

Thursday, February 25, 2016 — 4:30 PM EST

Title: The Replication Conjecture

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

Abstract: In 1972, Lovasz proved a key lemma that was the piece of the puzzle Fulkerson missed to prove the weak perfect graph theorem. This important lemma, called the Duplication Lemma, simply states that vertex duplication preserves graph perfection.

### C&O Reading Group - Yan Xu

Monday, February 22, 2016 — 4:15 PM EST

Title: Counting walks on graphs

### Matroid Theory Seminar - Iian Moffatt

Thursday, February 18, 2016 — 4:00 PM EST

Title: Matroid perspectives and graph polynomials

### Graph Theory Seminar - Luke Postle

Thursday, February 11, 2016 — 4:30 PM EST

Title: Claw decompositions of random 4-regular graphs

### Algebraic Graph Theory - Harmony Zhan

Thursday, February 11, 2016 — 3:30 PM EST

Title: Quantum walks and graph embeddings

### Seminar - Karen Yeats

Wednesday, February 10, 2016 — 9:00 AM EST

Title: Trees, chord diagrams and the renormalization group equation

Speaker: Karen Yeats Affiliation: Simon Fraser University Room: MC 5417

Abstract: How far can we get in understanding perturbative expansions in quantum field theory combinatorially?

### Seminar - Michaela Rombach

Monday, February 8, 2016 — 9:00 AM EST

Title: Graph representatives of positroid strata (juggling meets quantum physics)

### Tutte Colloquium - Ashwin Nayak

Friday, February 5, 2016 — 3:30 PM EST

Title: Sampling quantum states

### Matroid Theory Seminar - Jim Geelen CANCELLED

Thursday, February 4, 2016 — 4:00 PM EST

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 result

### Seminar - Hamza Fawzi

Wednesday, February 3, 2016 — 9:00 AM EST

Title: Understanding and improving convex formulations via lifted representations

### February 2016

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