Seminar

This fall (2023) we will have an active seminar.
September 14th
Speaker: Yanwen Luo (U.Vic)
Title: Drawing and Morphing Graphs on Surfaces
Abstract: In his famous paper ``How to draw a graph" in 1962, Tutte proposed a simple method to produce a straight-line embedding of a planar graph in the plane, known as Tutte's spring theorem. This construction provides not only one embedding of a planar graph, but infinite many distinct embeddings of the given graph. This observation leads to a surprisingly simple proof of a classical theorem proved by Bloch, Connelly, and Henderson in 1984 stating that the space of geodesic triangulations of a convex polygon is contractible. In this talk, we will introduce spaces of geodesic triangulations of surfaces, review Tutte's spring theorem, and present this short proof. We will briefly report the recent progress in identifying the homotopy types of spaces of geodesic triangulations of more complicated surfaces. This is joint work with Tianqi Wu and Xiaoping Zhu.
Location: DSB C130, 4pm--4:50pm
Date October 12th
Speaker: Yanwen Luo (U.Vic)
Title:
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Location: ?
Date October 19th
Speaker: Nicholas Rouse (UBC)
Title:
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Location: DSB C130 4pm--4:50pm
October 26th
Speaker: Tomasz Kaczynski (U.Sherbrooke)
Title:
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Location: COR B107 4pm--4:50pm
November 3rd
Speaker: Henry Segerman (Oklahoma State U.)
Title:
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Location: DSB C128, 3pm--3:50pm
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Seminar from 2022-2023.