Is it possible to paint the plane in $4$ colors so that inside any circle are the dots of all four colors?
Problem
Source: Tuymaada 2000 Juniors 2
Tags: combinatorics, combinatorial geometry, Coloring, Plane, Color problem
Source: Tuymaada 2000 Juniors 2
Tags: combinatorics, combinatorial geometry, Coloring, Plane, Color problem
Is it possible to paint the plane in $4$ colors so that inside any circle are the dots of all four colors?