School Colloquium (On Friday)——球面上的 Tarski 平板覆盖问题
主 题: School Colloquium (On Friday)——球面上的 Tarski 平板覆盖问题
报告人: Zilin Jiang (Israel Institute of Technology)
时 间: 2018-03-16 15:00-16:00
地 点: Room 1114, Sciences Building No. 1
Abstract: 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 Tóth from 1973. This is joint work with Alexandr Polyanskii.