Every four-dimensional Kakeya set has full Hausdorff dimension

OpenAI

Every subset of R⁴ containing a unit segment in every direction has Hausdorff dimension four, without a measurability, compactness or stickiness condition.

Sources for this record

What was already known

The cited general lower bound was 3.059. Stronger special-class results required additional hypotheses; the three-dimensional set conjecture was resolved separately.

AI involvement AI-led

OpenAI credits an internal model with the manuscript. The individual session record does not establish autonomous origin.

OpenAI is credited as author and its released collection attributes mathematical manuscripts to an internal model; no session-level record establishes autonomy.

Importance Major

Would resolve the four-dimensional Kakeya Hausdorff-dimension conjecture in full generality.

Limitations

The three-dimensional Kakeya maximal theorem is a separate input. No completed human proof review or matching machine check of this four-dimensional claim is documented.

Technical verification Reported

The manuscript presents a proof but the released release supplies no completed check of this theorem. Reported records that evidence gap, not a failed verification.

Human understanding Few

No named human explanation of the central multiscale reduction and contradiction was located; Few is the undocumented-understanding default.

Correction and publication history

2026-10-18 · publication

Would resolve the four-dimensional Kakeya Hausdorff-dimension conjecture in full generality.

Read this published revision