Erdős problem 138 · problems.science

If $W(k)$ is the least $N$ such that every two-colouring of $\{1, \dots, N\}$ contains a monochromatic $k$ -term arithmetic progression, must $W(k+1) - W(k) \to \infty$ ?

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FormalConjectures/ErdosProblems/

138.lean

Retained formal statement5 of 9

In [Er81] Erdős asks whether $\frac{W(k+1)}{W(k)} \to \infty$ .

FormalConjectures/ErdosProblems/138.leanErdos138.erdos_138.variants.quotient1 lineExact file

1True ↔ Filter.Tendsto (fun k => ↑(Erdos138.W (k + 1)) / ↑(Erdos138.W k)) Filter.atTop Filter.atTop

OpenStatement only, no proof

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