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Events

Thursday, December 8, 2016 — 2:00 PM EST

Title: Interpretations of the strong Arnold hypothesis

Speaker: Dr. Chris Godsil Affiliation: University of Waterloo Room: MC 6486

Abstract: I will discuss two interpretations of the strong Arnold hypothesis, indicating connections to bounds on sizes of cocliques, and to embedding graphs in quadrics.

Wednesday, December 7, 2016 — 3:30 PM EST

Title: Universal Newton Method

Speaker: Dr. Yurii Nesterov Affiliation: CORE/INMA UCL, Belgium Room: MC 5501

Abstract

Friday, December 2, 2016 — 3:30 PM to 5:00 PM EST

Title: On the Douglas-Rachford algorithm

Speaker: Dr. Heinz Bauschke Affiliation: University of British Columbia Room: MC 5501

Abstract:

The Douglas-Rachford algorithm is a popular splitting method for finding a minimizer of the sum of two convex (possibly nonsmooth) functions; or, more generally, a zero of the sum of two maximally monotone operators.

Thursday, December 1, 2016 — 3:30 PM EST

Title: On excluded minors for real-representability

Speaker: Rutger Campbell Affiliation: University of Waterloo Room: MC 5479

Abstract:

We show that any real representable matroid is a minor of an excluded-minor (for real-representability) that is complex-representable.

Thursday, December 1, 2016 — 2:00 PM EST

Title: Non positive eigenvalues and cographs

Speaker: John Sinkovic Affiliation: University of Waterloo Room: MC 6486

Abstract:

Friday, November 25, 2016 — 3:30 PM to 5:00 PM EST

Title: Stabilizing network bargaining games by blocking players.

Speaker: Dr. Laura Sanita Affiliation: University of Waterloo Room: MC 5501

Abstract:

Wednesday, November 23, 2016 — 4:00 PM EST

Title: Toward a Conjecture of Thomassen

Speaker: Michelle Delcourt Affiliation: University of Illinois, Urbana-Champaign Room: MC 6486

Abstract:

Friday, November 18, 2016 — 3:30 PM EST

Title: Towards a possible resolution of the flowing conjecture 

Speaker: Dr. Bertrand Guenin Affiliation: University of Waterloo Room: MC 5501

Abstract:

Thursday, November 17, 2016 — 1:30 PM to 2:20 PM EST

Title: Inversion arrangements and coessential sets

Speaker: Alex Woo Affiliation: University of Idaho & Fields Institute Room: MC 5417

Abstract:

Wednesday, November 16, 2016 — 4:30 PM EST

Title: Four Dimensional Polytopes of Minimum Positive Semidefinite Rank

Speaker: Kanstantsin Pashkovich Affiliation: University of Waterloo Room:  MC 2034

Abstract

Friday, November 11, 2016 — 3:30 PM EST

Title:

Speaker: Dr. Michele Mosca Affiliation: IQC, Perimeter Institute for Theoretical Physics, University of Waterloo Room:  MC 5501

Abstract:

Thursday, November 10, 2016 — 3:30 PM EST

Title: The two-point Fano

Speaker:  Ahmad Abdi Affiliation: University of Waterloo Room: MC 5479

Abstract:

Let F be a minimally non-ideal binary clutter, different from the three known examples of such clutters. We prove that through every element, either F or its blocker has the two-point Fano as a minor.

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

Title: The probability that a random subgraph contains a circuit

Speaker: Dr. Peter Nelson Affiliation:  University of Waterloo Room:  MC 6486

Abstract:

Thursday, November 10, 2016 — 1:30 PM to 2:20 PM EST

Title: Effective Analytic Combinatorics in Several Variables

Speaker: Steve Melczer Affiliation: University of Waterloo & ENS Lyon Room:  MC 5417

Abstract:

Friday, November 4, 2016 — 3:30 PM EDT

Title: From classical to quantum information

Speaker: Dr. Jon Yard Affiliation: Combinatorics & Optimization, Institute for Quantum Computing (IQC), University of Waterloo & Perimeter Institute for Theoretical Physics (PI), Room: MC 5501

Abstract:

Thursday, November 3, 2016 — 3:30 PM EDT

Title: Recognizing even-cycle and even-cut matroids

Speaker: Dr. Bertrand Guenin Affiliation: University of Waterloo Room: MC 6486

Abstract:

Thursday, November 3, 2016 — 2:00 PM EDT

Title: The trace inner product of projected matrices

Speaker: Gabriel Coutinho Affiliation:  University of São Paulo Room:  MC 6486

Abstract

Friday, October 28, 2016 — 3:30 PM EDT

Title: Quantum walks on irregular graphs

  Speaker: Gabriel Coutinho Affiliation: University of São Paulo Room: MC 5501

Abstract:

Thursday, October 27, 2016 — 3:30 PM EDT

Title: The probability that a random subgraph contains a circuit

Speaker: Dr. Peter Nelson Affiliation: University of Waterloo Room: MC 5479

Abstract:

Thursday, October 27, 2016 — 2:00 PM EDT

Title: A Looped 4-Vertex Path Never Has Perfect State Transfer

Speaker: Christopher van Bommel Affiliation: University of Waterloo Room: MC 6486

Abstract:

Thursday, October 20, 2016 — 3:30 PM EDT

Title: Dense PG(t-1,2)-free binary matroids

Speaker: Rutger Campbell Affiliation:  University of Waterloo Room:  MC 5479

Abstract:

Thursday, October 20, 2016 — 1:30 PM EDT

Title: Asymptotics for terminal chords in rooted chord diagrams

Speaker:  Dr. Karen Yeats Affiliation: University of Waterloo Room:  MC 5417

Abstract

Friday, October 14, 2016 — 4:00 PM EDT

Title: Quantum walks on regular graphs

Speaker: Krystal Guo Affiliation: University of Waterloo Room: MC 5501

Abstract:

Thursday, October 13, 2016 — 3:30 PM EDT

Title: Circle Graph Obstructions (Part 3 of 3)

Speaker: Edward Lee Affiliation: University of Waterloo Room: MC 5479

Abstract:

A circle graph is the intersection graph of a set of chords drawn on a circle.  In this talk we complete out graphic proof of Bouchet's characterization of the class of circle graphs.

Friday, October 7, 2016 — 3:30 PM EDT

Title: Some prime indexed graph invariants inspired by Feynman integrals

Speaker: Dr. Karen Yeats Affiliation: University of Waterloo Room: MC-5501

Abstract:

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