# Events

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

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

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\^

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

## Graph Theory Seminar - Ahmad Abdi

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.

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

## C&O Reading Group - Yan Xu

Title: Counting walks on graphs

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

## Matroid Theory Seminar - Iian Moffatt

Title: Matroid perspectives and graph polynomials

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

## Graph Theory Seminar - Luke Postle

Title: Claw decompositions of random 4-regular graphs

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

## Algebraic Graph Theory - Harmony Zhan

Title: Quantum walks and graph embeddings

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

## Seminar - Karen Yeats

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?

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

## Seminar - Michaela Rombach

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

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

## Tutte Colloquium - Ashwin Nayak

Title: Sampling quantum states

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

## Matroid Theory Seminar - Jim Geelen CANCELLED

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

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

## Seminar - Hamza Fawzi

Title: Understanding and improving convex formulations via lifted representations

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