OpenAI reports a pinched Kähler threefold without bounded coordinates

There is a contractible complex three-dimensional domain with a complete Kähler metric whose real sectional curvatures lie between two negative constants, yet it has no bounded holomorphic map to complex three-space with nowhere-vanishing Jacobian and is not biholomorphic to a bounded domain.

Sources for this record

What was already known

Wu and Yau formulated a two-sided negatively pinched Kähler uniformization question. Earlier intrinsic-metric comparisons did not produce bounded holomorphic coordinate functions; a different companion example had only one-sided curvature control.

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

Answers the two-sided negatively pinched Kähler uniformization question negatively.

Limitations

The example has two bounded nonconstant holomorphic functions; the obstruction is to a full bounded coordinate system with independent differentials.

Technical verification Formal (Lean 4)

OpenAI reports a Lean proof matching the selected claim.

Formal checking

The pinned Lean note constructs the complete two-sided negatively pinched Kähler threefold and proves absence of bounded holomorphic coordinates and bounded-domain realization.

Checker
OpenAI-reported Lean 4 / Comparator
Scope
There is a contractible complex three-dimensional domain with a complete Kähler metric whose real sectional curvatures lie between two negative constants, yet it has no bounded holomorphic map to complex three-space with nowhere-vanishing Jacobian and is not biholomorphic to a bounded domain.
Basis
Reported by the linked checker
Evidence source

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

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