Problem

erdos:508

4 ≤ (SimpleGraph.UnitDistancePlaneGraph Set.univ).chromaticNumber

Open Current State

Declared status: open
Formalization: formalized
Subjects: geometryramsey theory
OEIS: N/A
Sources: source:erdos-problemssource:formal-conjectures
Statement: www.erdosproblems.com

Hadwiger-Nelson problem

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