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Wednesday, September 26, 2018 — 4:00 PM EDT

Title: Classification, Regularization and Logistic Regression

Speaker: Haesol Im
Affiliation: University of Waterloo
Room: MC 5479

Abstract: For the first two seminar series in machine learning,

Thursday, September 27, 2018 — 3:30 PM EDT

Title: A characterization of (p,q)-mixing when p/q < 4

Speaker: Ben Moore
Affiliation: University of Waterloo
Room: MC 5417

Abstract: Let Hom(G,H) be the graph whose vertex set is the set of H-colourings of G, and two H-colourings f and g are adjacent if f differs from g in at most one vertex.

Friday, September 28, 2018 — 3:30 PM EDT

Title: The Shapiro-Shapiro Conjecture

Speaker: Kevin Purbhoo
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

Given four lines in 3-space, can you find a fifth line that intersects the other four? How many?

This is the smallest non-trivial example of a "Schubert problem". The answer, in this case, is not hard to compute: there are two such lines. Generalizations of this fact date back to 19th century work of Schubert.

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