Hellinger contraction with arbitrary Boolean output bias

OpenAI

For every Boolean function on the uniform discrete cube, including biased outputs, and every product-noise correlation ρ∈[−1,1], the manuscript claims H(Ef)−E H(Tρf)≤1−H(ρ), where H(t)=sqrt(1−t²). Signed coordinates attain equality.

Sources for this record

What was already known

Earlier work posed this inequality and proved restricted cases or weaker mean-dependent bounds. Separate 2026 results address the weaker Courtade–Kumar information inequality.

AI involvement AI-led

OpenAI attributes the Hellinger manuscript to its internal model. The proof draws on earlier human methods for Boolean-noise inequalities.

OpenAI authorship and the cited release's model-production account support AI-led mathematical work; autonomous session provenance is absent.

Importance Notable

The sharp arbitrary-bias inequality resolves the full Hellinger conjecture and implies the information bound.

Limitations

The supplied exact-arithmetic programs have instructions but no recorded successful run; no completed check of the analytic reductions is documented. A companion Lean theorem proves a different information statement.

Technical verification Reported

The manuscript supplies a computer-assisted analytic proof and exact-arithmetic programs, but the available release gives instructions for running the programs without a recorded successful run or a completed check of the full theorem. Reported is the evidence default. The Lean scope for result 119 concerns binary information contraction, not this Hellinger inequality.

Human understanding Few

No human account of the new asymmetric induction, calibrated energy continuation and certificate interfaces is documented. Few is the evidence default, not a claim that people cannot understand them.

Correction and publication history

2026-10-18 · publication

If correct, the sharp arbitrary-bias inequality resolves the full Hellinger conjecture and implies the information bound.

Read this published revision