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.
Problem statement
Let denote the cardinality of the continuum. For ordinals , and a cardinal , the 3-uniform ordinal Ramsey property is defined as follows: for every 2-coloring of the 3-element subsets of (identified with its ordinal type), either there exists a subset of order type all of whose 3-element subsets are colored red, or there exists a subset of cardinality 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 and every integer , the partition relation holds.
Lean 4
Formal statement
Lean 4theorem erdos_70 :
answer(sorry) ↔
∀ᵉ (β : Ordinal.{0}) (n : ℕ) (_ : β.card ≤ ℵ₀) (_ : 2 ≤ n),
OrdinalCardinalRamsey3 (𝔠).ord β nOn-site verification needs an executable Lean target. None is attached yet.
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.
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