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Four Is Not Enough

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  • Jun 18, 2018
  • #Math
Patrick Honner
@MrHonner
(Author)
www.quantamagazine.org
Read on www.quantamagazine.org
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How many colors do you need to color an infinite plane so that no points 1 unit apart are the same color?

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Greg Egan @gregeganSF · Oct 20, 2022
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[6/6] So no same-coloured points can be exactly a distance of 1 apart. Here’s a great intro by @MrHonner to the “Hadwiger-Nelson problem”: how many colours are needed to ensure that no two points on the plane a unit distance apart share the same colour?
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