A logarithmic independence bound for clique-free graphs

OpenAI

Theorem 1.1 claims that for every fixed integer r ≥ 4, each finite K_r-free graph on n vertices with average degree d ≥ 2 has an independent set of size at least c_r n log(d)/d, with c_r > 0 independent of n and d. It removes a log-log denominator in the fixed-clique-size average-degree bound; the paper does not optimize c_r or give an efficient algorithm.

Sources for this record

What was already known

Ajtai, Komlós and Szemerédi proved the logarithmic order for triangle-free graphs. Ajtai, Erdős, Komlós and Szemerédi conjectured it for every fixed forbidden clique. Shearer's general K_r-free average-degree lower bound retained a log-log d denominator; later structural results had additional hypotheses.

AI involvement AI-led

OpenAI credits an internal model with the result and is the manuscript's author. The earlier conjecture and bounds are human work; no human proof check of the manuscript is reported.

OpenAI authors and releases the full claimed bound as internal-model work; autonomy beyond that is undocumented.

Importance Major

Claims the fixed-clique-size average-degree bound conjectured by Ajtai, Erdős, Komlós and Szemerédi.

Limitations

The bound holds for each fixed r≥4 and average degree d≥2, with a constant depending on r. It does not optimize that constant or provide an efficient algorithm. The documented independent check builds and audits the Lean statement, not the prose proof.

Technical verification Formal (Lean)

The release catalog and family scope note identify a Lean proof of precisely the r ≥ 4 average-degree statement. A dated independent Erdős Problems audit reports building the solution and challenge, checking only the standard Lean axioms, and matching statement fingerprints. This verifies the formal theorem, not a separate hand review of every manuscript step.

Formal checking

Built OAI.CliqueFreeLog.logarithmic_independence_bound and comparator challenge; checked axioms and statement fingerprint

Checker
Erdős Problems claim-audit corpus, independent of the release
Scope
For every fixed r ≥ 4, K_r-free graphs of average degree d ≥ 2 satisfy α(G) ≥ c_r n log d/d
Basis
Reported by the linked checker
Evidence source

Checking a formal statement does not establish that it matches the original problem.

Human understanding Few

The manuscript gives a proof outline and a later audit maps its structure, but no identified human author explains the central entropy and splitting mechanism from an independent understanding review; this is a missing-evidence default.

Correction and publication history

2026-10-18 · publication

Claims the fixed-clique-size average-degree bound conjectured by Ajtai, Erdős, Komlós and Szemerédi.

Read this published revision