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Numerical semiampleness and generalized minimal models

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Proves numerical semiampleness for nef adjoints \(K_X+B+M\) with \(K_X+B\) pseudo-effective and M nef rational, for projective klt rational pairs over algebraically closed characteristic-zero fields and smooth compact Kähler rational klt simple-normal-crossing pairs, using Bott–Chern cohomology in the latter case. Separately, projective generalized log canonical rational pairs over such fields admit minimal models for pseudo-effective adjoints and Mori fiber spaces otherwise, with nef b-data fixed.

The release has no Lean statement for this family, so there is no formal statement to compare with the result described above.

Four current papers; one replaced by a later edition.

The paper states

Theorem 1.1

In Minimal models and Mori fibre spaces for generalized log canonical Q-pairs

Possible match to OpenAI’s description, selected from the papers’ main statements because it shares the most wording. No review confirming the selection is recorded.

Seven other possible matches are listed below the card, among them Corollary 1.2 (Ordinary log canonical pairs) in the same paper and Theorem 1.2 in Numerical semiampleness of nef adjoint classes on compact Kähler manifolds.

Let k be an algebraically closed field of characteristic zero, and let (X,B+M) be a projective generalized log canonical \Q-pair. Thus X is normal and integral, B is an effective rational boundary, and M is the trace of a nef rational Cartier divisor on a higher projective birational model, with K_X+B+M \Q-Cartier.

There are a normal integral projective variety Y and a birational map \phi\colon X\dashrightarrow Y whose inverse contracts no divisors such that, writing B_Y=\phi_*B and taking M_Y to be the trace of the same nef b-divisor, the generalized pair (Y,B_Y+M_Y) is log canonical and

A_{X,B+M}(E)\le A_{Y,B_Y+M_Y}(E)

for every prime divisor E over their common function field. The inequality is strict for every divisor on X contracted by \phi. More precisely, the following alternatives are determined by D=K_X+B+M:

  1. 1.

    if D is pseudo-effective, then K_Y+B_Y+M_Y is nef;

  2. 2.

    if D is not pseudo-effective, there is a projective contraction h\colon Y\to T to a normal projective variety with connected fibres such that

    \dim T<\dim Y,\qquad \rho(Y/T)=1, \qquad -(K_Y+B_Y+M_Y)\text{ is ample over }T.

Seven more possible matches

  • Corollary 1.2 (Ordinary log canonical pairs) in Minimal models and Mori fibre spaces for generalized log canonical Q-pairs.
  • Theorem 1.2 in Numerical semiampleness of nef adjoint classes on compact Kähler manifolds, 6 October 2026.
  • Theorem 1.1 in Numerical semiampleness of nef adjoint classes on compact Kähler manifolds, 6 October 2026.
  • Theorem 1.1 in Numerical Semiampleness of Nef Adjoint Divisors, 3 October 2026.
  • Theorem 1.1 in Minimal models in numerical dimension one.
  • Corollary 1.2 in Numerical Semiampleness of Nef Adjoint Divisors, 3 October 2026.
  • Corollary 1.2 (Good minimal model) in Minimal models in numerical dimension one.
Reported proof verification
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Papers

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Numerical semiampleness of nef adjoint classes on compact Kähler manifolds

6 October 2026, current edition.

Read it herePDF

This version states the Iitaka, model, and contraction inputs used in the divisorial-decomposition argument explicitly; see the previous version.

Earlier editions: 4 October 2026

Let X be a smooth connected compact Kähler manifold, let B be an effective rational simple normal crossing divisor with coefficients less than one, and let M be a nef rational holomorphic line bundle on X. If \(K_X+B\) is pseudo-effective and \(K_X+B+M\) is nef, we prove that its first Chern class in real Bott–Chern cohomology is represented by a semiample rational line bundle. This numerical statement allows a flat change of line bundle; it does not assert semiampleness of the original adjoint.

Numerical Semiampleness of Nef Adjoint Divisors

3 October 2026, current edition.

Read it herePDF

We prove the Generalised Abundance Conjecture: if \((X,B)\) is a projective klt ℚ-pair over an algebraically closed field of characteristic zero, \(K_X+B\) is pseudo-effective, M is a nef ℚ-Cartier divisor on X, and \(K_X+B+M\) is nef, then \(K_X+B+M\) is numerically equivalent to a semiample ℚ-Cartier divisor on X.

Minimal models and Mori fibre spaces for generalized log canonical Q-pairs

Undated, current edition.

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We resolve the existence form of the minimal-model conjecture for projective generalized log canonical ℚ-pairs over algebraically closed fields of characteristic zero. Such a pair admits a minimal model when its adjoint divisor is pseudo-effective, and a Mori fibre space otherwise, while keeping the nef ℚ-Cartier b-divisor fixed. Taking the nef part to be zero gives the corresponding result for ordinary log canonical ℚ-pairs.

Minimal models in numerical dimension one

Undated, current edition.

Read it herePDF

We resolve the numerical-dimension-one case of the minimal-model conjecture for smooth connected complex projective varieties of dimension at least three. If KX is pseudo-effective and \(\kappa_\sigma(X,K_X)=1\), with κσ defined by section growth with a fixed ample twist, then X admits a projective ℚ-factorial terminal minimal model.

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