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chromaticNumber_johnson_2k_k_lower_bound

Specification

It is known that for $3 \leq k \leq 8$, the chromatic number of $J(2k, k)$ is greater than $k+1$, see [Johnson graphs](https://aeb.win.tue.nl/graphs/Johnson.html).

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Lean 4 Statement 
theorem chromaticNumber_johnson_2k_k_lower_bound (hk : 3 ≤ k) (hk' : k ≤ 8) :
    k + 1 < J(2 * k, k).chromaticNumber
ID: ErdosProblems__835__chromaticNumber_johnson_2k_k_lower_bound
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