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Friday, June 22, 2018 — 3:30 PM EDT

Title: Two-level polytopes

Speaker: Kanstantsin Pashkovich
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

This talk is dedicated to two-level polytopes. On one side, two-level polytopes form a well structured family of polytopes.

Thursday, June 28, 2018 — 11:30 AM EDT

Title: A single pass bijection between certain quarter plane lattice walks and certain Motzkin-like paths.

Speaker: Nick Olson-Harris
Affiliation: University of Waterloo
Room: MC 6486

Abstract: A p-tandem quarter plane walk is a walk starting at the origin and remaining in the first quadrant using the steps (1,-1) and (-n, p-n) for n between 0 and p.

Thursday, June 28, 2018 — 3:30 PM EDT

Title: Stretching drawings of graphs

Speaker: Alan Arroyo
Affiliation: University of Waterloo
Room: MC 5479

Abstract: Given a drawing D of a graph (where vertices are dots in the plane and edges are arbitrary curves connecting some pairs of dots),

Friday, June 29, 2018 — 3:30 PM EDT

Title: The c2 invariant at p=2 by counting edge bipartitions

Speaker: Karen Yeats
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

Since no one provided a visitor or volunteered for this week, I will explain how to prove a special case of a conjecture about the c2 invariant. 

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