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Friday, June 7, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Colloquium - Ting Kei Pong

Title: Deducing Kurdyka-Łojasiewicz exponent of optimization models

Speaker: Ting Kei Pong
Affiliation:

The Hong Kong Polytechnic University

Room: MC 5501

Abstract:

Kurdyka-Łojasiewicz (KL) exponent is an important quantity for determining the qualitative convergence behavior of many first-order methods.

Wednesday, June 12, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Graphs and Matroids Seminar - David Wagner

Title: Spanning trees and electrical networks... and what about matroids?

Speaker: David Wagner
Affiliation: University of Waterloo
Room: MC 5479

Abstract:

The relevance of spanning trees to the theory of electrifcal networks goes all the way back to Kirchhoff in 1847.

Friday, June 14, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Colloquium - Jochen Koenemann

Title: Matching Games: From Bargaining to the Nucleolus

Speaker: Jochen Koenemann
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

Cooperative matching games were first introduced in seminal work by Shapley and Shubik in their classic 1971 paper. In this talk, I will first review some of the key concepts and results in this area. I will then use these tools to (re-)derive several facts and algorithms for network generalizations of the famous Nash bargaining concept.

Thursday, June 20, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Algebraic Combinatorics Seminar - Pierre Clavier

Title: Arborified zeta values and shuffles of rooted trees

Speaker: Pierre Clavier
Affiliation: Potsdam University
Room: MC 6483*

*Please note room change

Abstract:

Arborified zeta values are a generalisation to rooted trees of the usual multizeta values.

Thursday, June 20, 2019 4:00 pm - 4:00 pm EDT (GMT -04:00)

PMath/C&O Joint Colloquium - Eric Thomas Boulter

Title: The Parallel Postulate: a 2000-year controversy

Speaker: Eric Thomas Boulter
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

Euclid's book The Elements was groundbreaking in its logical formulation of synthetic geometry, and it is profoundly influential to this day, as it is widely considered to be the most published non-religious book in human history.

Thursday, June 20, 2019 4:00 pm - 4:00 pm EDT (GMT -04:00)

Joint PM and C&O Colloquium - Eric Thomas Boulter

Title: The Parallel Postulate: a 2000-year controversy

Speaker: Eric Thomas Boulter
Affiliation: University of Waterloo
Room: MC 5501 (Snacks served at 3:30 pm)

Abstract:

Euclid's book The Elements was groundbreaking in its logical formulation of synthetic geometry, and it is profoundly influential to this day, as it is widely considered to be the most published non-religious book in human history.

Friday, June 21, 2019 1:00 pm - 1:00 pm EDT (GMT -04:00)

Combinatorial Optimization Reading Group - Ishan Bansal

Title: Maximum Cardinality Popular Matchings

Speaker: Ishan Bansal
Affiliation: University of Waterloo
Room: MC 5479

Abstract:

We have seen the algorithm by Abraham, Irving, Kavitha, and Mehlhorn which deals with finding popular matchings (can be easily modified to give maximum cardinality popular matchings) in bipartite graphs with one-sided preference lists.

Friday, June 21, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Colloquium - Michael Anastos

Title: Finding perfect matchings in random regular graphs in linear expected time

Speaker: Michael Anastos
Affiliation: Carnegie Mellon University
Room: MC 5501

Abstract:

In a seminal paper on finding large matchings in sparse random graphs, Karp and Sipser proposed two algorithms for this task. The second algorithm has been intensely studied, but due to technical difficulties, the first algorithm has received less attention. Empirical results suggest that the first algorithm is superior.