# Moser Spindles, Golomb Graphs and Root 33

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If the plane is divided into colors, what is the least such that any two points a unit distance apart have different colors? This is the unsolved Hadwiger–Nelson problem, whose answer is 4, 5, 6 or 7 colors.

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Contributed by: Ed Pegg Jr (December 2017)

Open content licensed under CC BY-NC-SA

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## Permanent Citation

"Moser Spindles, Golomb Graphs and Root 33"

http://demonstrations.wolfram.com/MoserSpindlesGolombGraphsAndRoot33/

Wolfram Demonstrations Project

Published: December 21 2017