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Wednesday, January 15, 2014 9:30 am - 9:30 am EST (GMT -05:00)

Seminar - Michael Friedlander

Data Fitting and Optimization With Randomized Sampling

Speaker: Michael Friedlander
Affiliation: University of British Columbia
Room: Mathematics and Computer Building (MC) 5168

Abstract: 

For many structured data-fitting applications, stochastic gradient methods offer inexpensive iterations by sampling only subsets of the data. They make great progress initially, but eventually stall.

Monday, January 20, 2014 9:30 pm - 9:30 pm EST (GMT -05:00)

Seminar - Vera Roshchina

Weird Convex Cones and Geometric Properties of Ill-posed Conic Problems

Speaker: Vera Roshchina
Affiliation: Collaborative Research Network, Federation University Australia
Room: Mathematics and Computer Building (MC) 5168

Abstract: 

I will present several results related to the structural properties of finite- dimensional convex cones.

Friday, January 24, 2014 9:30 am - 9:30 am EST (GMT -05:00)

Seminar - Hao Huang

The Minimum Number of Non-negative Edges in Hypergraphs

Speaker: Hao Huang
Affiliation: Institute for Advanced Study and DIMACS
Room: Mathematics and Computer Building (MC) 5158

Abstract: 

Extremal combinatorics studies the maximum or minimum possible size of a combinatorial structure satisfying certain properties.

Wednesday, January 29, 2014 3:30 pm - 3:30 pm EST (GMT -05:00)

Seminar - Ahmad Abdi

Packing T-Joins, Colouring Problems, and Matching Theory

Speaker: Ahmad Abdi
Affiliation: University of Waterloo, C & O
Room: Mathematics and Computer Building (MC) 6486

Abstract:

This is the first and introductory talk of the Graph Theory Seminar Series. In this talk, I will try to motivate and give an introduction to different areas of graph theory.

Wednesday, January 29, 2014 9:30 pm - 9:30 pm EST (GMT -05:00)

Seminar - Cynthia Vinzant

Determinants, Hyperbolicity and Interlacing

Speaker: Cynthia Vinzant
Affiliation: University of Michigan
Room: Mathematics and Computer Building (MC) 5158

Abstract: 

Writing a multivariate polynomial as the determinant of a matrix of linear forms is a classical problem in algebraic geometry and

Friday, February 7, 2014 3:30 pm - 3:30 pm EST (GMT -05:00)

Tutte seminar - Bruce Richter

Recent Progress on Tutte's 3-flow Conjecture

Speaker: Bruce Richter
Affiliation: University of Waterloo
Room: Mathematics and Computer Building (MC) 5158

Abstract: 

Tutte's 3-flow conjecture asserts that every graph with no 1- or 3-edge-cut has an orientation so that, at every vertex, the number of arcs pointing in is the same (modulo 3) as the number of arcs pointing out.

Tuesday, February 11, 2014 4:00 pm - 4:00 pm EST (GMT -05:00)

Combinatorics and Optimization Professor talk - Eric Katz

The genus formula and tropical geometry

Speaker: Professor Eric Katz
Affiliation: University of Waterloo
Room: Mathematics and Computer Building (MC) 4040

Abstract:

A complex homogeneous polynomial in three variables describes an algebraic curve in projective space. This algebraic curve is a topologically a surface. We can ask what is the genus of the surface is in terms of the degree of the polynomial.

Wednesday, February 12, 2014 3:30 pm - 3:30 pm EST (GMT -05:00)

Seminar - Cheolwon Heo

Perfect Path Double Covers of Graphs

Speaker: Cheolwon Heo
Affiliation: Combinatorics and Optimization, University of Waterloo
Room: Mathematics and Computer Building (MC) 5168

Abstract: 

A cycle double cover (CDC) of a graph G is a collection C of cycles of G such that each edge of G lies in exactly two cycles of C. There is a well known conjecture of Seymour that every bridgeless graph admits a CDC.

Friday, February 14, 2014 3:30 pm - 3:30 pm EST (GMT -05:00)

Tutte seminar - Laurent Poirrier

Multi-row Approaches to Cutting Plane Generation

Speaker: Jintai Ding
Affiliation: University of Cincinnati
Room: Mathematics and Computer Building (MC) 5168

Abstract: 

We cover two topics in the generation of multi-row cutting planes.

In the first one, we present a separation method for two-row cuts.
Two-row cuts are intersection cuts from two rows of a simplex tableau

Monday, February 24, 2014 2:30 pm - 2:30 pm EST (GMT -05:00)

Seminar - Ricky Liu

Subalgebras of the Fomin-Kirillov Algebra

Speaker: Ricky Liu
Affiliation: University of Michigan
Room: Mathematics and Computer Building (MC) 5158

Abstract: 

One of the main unsolved problems in Schubert calculus is to give a combinatorial formula for the structure constants in the cohomology of the flag variety.