2018 PAMO Shortlist: Colouring regions created by lines in a plane
Source: 2018 Pan-African Shortlist - C5
May 7, 2019
combinatoricsGraph coloring
Problem Statement
A set of lines are said to be in standard form if no two are parallel and no three are concurrent. Does there exist a value of such that given any lines in standard form, it is possible to colour the regions bounded by the lines using colours in such a way that no two regions of the same colour share a common intersection point of the lines?