OpenAI reports uniform interior C¹,α bounds for infinity-harmonic functions

For each integer d≥3 there are αd∈(0,1/3] and Cd<∞ such that every bounded infinity-harmonic function on the unit ball has gradient supremum and αd-Hölder seminorm on the half ball bounded by Cd times its oscillation on the unit ball.

Sources for this record

What was already known

Evans and Smart proved differentiability everywhere in all dimensions, while Savin and Evans–Savin established planar gradient continuity and a planar Hölder estimate. General higher-dimensional uniform interior gradient Hölder bounds remained open.

AI involvement AI-led

OpenAI credits itself as manuscript author and states that its internal frontier model produced the results in this release. Individual human input is not detailed enough to establish task-only autonomy.

OpenAI is named as author on the manuscript, and its release attributes the results to an internal frontier model. The individual human input is not detailed enough to establish autonomy.

Importance Major

Upgrades pointwise differentiability to uniform local C¹,α regularity in every higher dimension.

Limitations

The exponent is dimension-dependent and nonexplicit; no endpoint 1/3 or boundary estimate is claimed. No independent formal proof check is documented for this manuscript.

Technical verification Reported

Reported is the default when evidence for a higher level is insufficient. The OpenAI-authored manuscript reports and argues the result, but the reviewed sources do not document a completed check of the full assessed claim.

Human understanding Few

Few is the default when evidence for a higher level is insufficient. No named person is documented as explaining the central argument for this assessed contribution.

Correction and publication history

2026-10-18 · publication

Primary manuscript, attribution, prior-work, and scoped checking review for non-notifying local inclusion.

Read this published revision