PPL 061 / 177 permanent IDsPrize Problem Ledger · PPLChecked 2026.07.26
Prize Problem LedgerErdősPPL 061Erdős Problem #564

Permanent problem IDPPL 061

Verified openErdősconjecture

Graph theory

Erdős Problem #564

Let R_3(n) be the minimal m such that if the edges of the 3-uniform hypergraph on m vertices are 2-coloured then there is a monochromatic copy of the complete 3-uniform hypergraph on n vertices. Is there some constant c>0 such that R_3(n) ≥ 2^{2^(cn)}?

graph theoryramsey theoryhypergraphs
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The problem

Let R_3(n) be the minimal m such that if the edges of the 3-uniform hypergraph on m vertices are 2-coloured then there is a monochromatic copy of the complete 3-uniform hypergraph on n vertices. Is there some constant c>0 such that R_3(n) ≥ 2^{2^(cn)}?

Open since1965exact
Last checked2026.07.26Catalog verification
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Reward offers

Offer 01$500Paul Erdős / Combinatorics Foundation
Documented

A solution must appear in a reputable journal, with documentation that Erdős offered the displayed amount. Claims are administered by the Combinatorics Foundation; erdosproblems.com does not pay awards.

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Sources & reading