Shokurov's global index conjecture for threefold foliations

Jihao Liu, Sheng Qin

Liu and Qin prove a uniform index I for projective log-canonical foliated triples of dimension at most three with K_F+B numerically trivial and coefficients in a fixed rational DCC set, so I(K_F+B) is linearly trivial. Rethlas contributed the non-algebraically-integrable case split and Lie-theoretic route.

Sources for this record

What was already known

The log version with nonzero boundary, lower-dimensional cases, and non-effective threefold results were known. The effective non-algebraically-integrable threefold cases were the main gap.

AI involvement AI-centered

Rethlas proposed a dimension-three reduction and Lie-theoretic strategy for difficult cases. Liu and Qin supplied essential repairs and the rigorous final argument.

Rethlas supplied a central Lie-theoretic strategy for the difficult non-algebraically-integrable cases, while human additions were essential to the final theorem.

Importance Notable

The repaired route supports a threefold resolution of the stated global-index question.

Limitations

Rethlas missed references and necessary details. Liu and Qin supplied the log-canonical reduction, references, finite-cover and equivariance steps needed for the final theorem.

Technical verification Formal (human)

The named human authors report verification and replaced model gaps with a rigorous proof; the source identifies missing references and case-specific repairs. The completed human check is author-reported.

Formal checking

Human verification and rigorous reorganization of generated argument, supplying missing references and finite-cover/equivariance steps

Checker
Jihao Liu and Sheng Qin, paper authors
Scope
Final dimension-at-most-three global-index Theorems 1.1 and 1.2, including repaired Rethlas-origin cases
Basis
Reported by the linked checker
Evidence source

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

Human understanding Full

The authors explain the rank and algebraic-rank split, the Lie-theoretic mechanism, the missing references and the precise human repairs.

Correction and publication history

2026-10-18 · publication

The repaired route supports a threefold resolution of the stated global-index question.

Read this published revision