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OP-6724Status unassessedLogic and foundations

The 3-uniform partition relation for the continuum

TheoremDB P8358 · Candidate awaiting source review

Inferred from the community field; finer classification has not been reviewed.

Source candidate · not reviewedAs of 2026-09-08Source & evidence ↓

Problem statement

Let c\mathfrak{c} denote the cardinality of the continuum. For ordinals α\alpha, β\beta and a cardinal cc, the 3-uniform ordinal Ramsey property α→(β,c)23\alpha \to (\beta, c)^3_2 is defined as follows: for every 2-coloring of the 3-element subsets of α\alpha (identified with its ordinal type), either there exists a subset of order type β\beta all of whose 3-element subsets are colored red, or there exists a subset of cardinality cc all of whose 3-element subsets are colored blue. The coloring is formally given as a symmetric predicate on ordered triples of distinct elements. Determine whether for every countable ordinal β\beta and every integer n≥2n \geq 2, the partition relation c→(β,n)23\mathfrak{c} \to (\beta, n)^3_2 holds.

Lean 4

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Formal statement

Lean 4
theorem erdos_70 :
    answer(sorry) ↔
    ∀ᵉ (β : Ordinal.{0}) (n : ℕ) (_ : β.card ≤ ℵ₀) (_ : 2 ≤ n),
      OrdinalCardinalRamsey3 (𝔠).ord β n

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A source attachment or link is not a verified proof. The statement’s correspondence with the original question needs human review.

Proofs & verification

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Progress & source assessment

Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.

Open. No signed Lean verification is attached to this problem or its selected resolution.

This record is in the source backlog; its novelty and unresolved status have not passed source review.

References
  1. [1]TheoremDB P8358 link
  2. [2]Source formal statement (not locally verified) link

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