[KarlInOhio]

The four color map problem has been proven where only four colors are needed to color a map so that no two touching regions are the same color. This is a more general problem in which no two points a given distance apart are the same color.

https://en.m.wikipedia.org/wiki/Hadwiger–Nelson_problem

Also "The Hadwiger-Nelson problem" sounds like an episode title for The Big Bang Theory where Sheldon does something clueless and upsets everyone.

[mywholebodyisaweapon]

Thanks for the clarification. Glad to know that the four-color solution lives.

Sounds like a new SJ-planned society. Ugh.