Chromatic Number of the Plane: The Problem
摘要
Our good ole Euclidean plane, don’t we know all about it? What else can there be after Pythagoras and Steiner, Euclid, and Hilbert? In this chapter, we will look at an open problem that exemplifies what is best in mathematics: Anyone can understand this problem; yet, no one has been able to conquer it in 73 years.