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johnsonGraph_18_9_chromaticNumber

Specification

The smallest case not on this page is $k=9$: But that one can be solved as well: The chromatic number of $J(18, 9)$ is at least $11$.

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Lean 4 Statement 
theorem johnsonGraph_18_9_chromaticNumber : J(18, 9).chromaticNumber > 9 + 1
ID: ErdosProblems__835__johnsonGraph_18_9_chromaticNumber
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