erdos_590

Let $α$ be the infinite ordinal $\omega^{\omega}$. It was proved by Chang [Ch72] that any red/blue colouring of the edges of $K_α$ there is either a red $K_α$ or a blue $K_3$.

theorem erdos_590 : OrdinalCardinalRamsey (ω ^ ω) (ω ^ ω) 3

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