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erdos_188

Specification

What is the smallest $k$ such that $\mathbb{R}^2$ can be red/blue coloured with no pair of red points unit distance apart, and no $k$-term arithmetic progression of blue points with distance 1?

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Lean 4 Statement 
theorem erdos_188 : IsLeast s answer(sorry)
ID: ErdosProblems__188__erdos_188
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