Combinatorics Seminar

Wednesday, September 05, 2018 at 4:15pm to 5:15pm

Room 2-147

SPEAKER:  Zilin Jiang  (MIT)

TITLE:  Sperical Tarski's Plank Problem


A zone of width ω on the unit sphere is defined as the set of points within spherical distance ω/2 of a given great circle.  Zones can be thought of as the spherical analogue of planks.  In this talk we show that the total width of any (finite) collection of zones covering the unit sphere is at least Π, answering a question of Fejes Toth from 1973.  This is joint work with Alexandr Polyanskii.

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