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Thursday, December 8, 2016 — 2:00 PM EST
Title: Interpretations of the strong Arnold hypothesis
| Speaker: | 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: | 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: | 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: | 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: | 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: | 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: | 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: | 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: | 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: | 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: | 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: | Karen Yeats |
| Affiliation: | University of Waterloo |
| Room: | MC-5501 |
Abstract: