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We prove the existence of good minimal models for any klt algebraically integrable adjoint foliated structure of general type, and that Fano algebraically integrable adjoint foliated structures with total minimal log discrepancies and…

Algebraic Geometry · Mathematics 2025-04-16 Paolo Cascini , Jingjun Han , Jihao Liu , Fanjun Meng , Calum Spicer , Roberto Svaldi , Lingyao Xie

For $\mathbb Q$-factorial klt algebraically integrable adjoint foliated structures, we prove the cone theorem, the contraction theorem, and the existence of flips. Therefore, we deduce the existence of the minimal model program for such…

Algebraic Geometry · Mathematics 2024-08-27 Paolo Cascini , Jingjun Han , Jihao Liu , Fanjun Meng , Calum Spicer , Roberto Svaldi , Lingyao Xie

We show that termination of flips for $\mathbb Q$-factorial klt pairs in dimension $r$ implies existence of minimal models for algebraically integrable foliations of rank $r$ with log canonical singularities over a $\mathbb Q$-factorial klt…

Algebraic Geometry · Mathematics 2023-03-15 Paolo Cascini , Calum Spicer

Given a canonical algebraically integrable foliation on a klt projective variety, we study the variation of the ample models of the associated adjoint foliated structures with respect to the parameter. When the foliation is of general type,…

Algebraic Geometry · Mathematics 2025-10-06 Paolo Cascini , Jihao Liu , Fanjun Meng , Roberto Svaldi , Lingyao Xie

Assuming the abundance conjecture in dimension $d$, we establish a non-algebraicity criterion of foliations: any log canonical foliation of rank $\le d$ with $\nu\neq\kappa$ is not algebraically integrable, answering question of…

Algebraic Geometry · Mathematics 2025-10-10 Jihao Liu , Zheng Xu

In this paper, we generalise the theory of complements to log canonical log fano varieties and prove boundedness of complements for them in dimension less than or equal to 3. We also prove some boundedness results for the canonical index of…

Algebraic Geometry · Mathematics 2019-01-15 Yanning Xu

For Fano fibrations with $\epsilon$-lc singularities of a fixed dimension, we show the existence of bounded relative-global complements. If the base of the fibration is of dimension one, we even show the existence of bounded relative-global…

Algebraic Geometry · Mathematics 2024-02-20 Sung Rak Choi , Chuyu Zhou

In this paper we prove that a regular foliation on a complex weak Fano manifold is algebraically integrable.

Algebraic Geometry · Mathematics 2015-10-19 Stéphane Druel

We prove that for any two minimal models of an lc algebraically integrable foliated triple on potentially klt varieties, there exist small birational models that are connected by a sequence of flops. In particular, any two minimal models of…

Algebraic Geometry · Mathematics 2024-10-10 Yifei Chen , Jihao Liu , Yanze Wang

This paper is concerned with a sufficient criterion to guarantee that a given foliation on a normal variety has algebraic and rationally connected leaves. Following ideas from a preprint of Bogomolov-McQuillan and using recent works of…

Algebraic Geometry · Mathematics 2009-09-29 Stefan Kebekus , Luis Sola Conde , Matei Toma

For lc algebraically integrable foliations on klt varieties, we prove the base-point-freeness theorem, the contraction theorem, and the existence of flips. The first result resolves a conjecture of Cascini and Spicer, while the latter two…

Algebraic Geometry · Mathematics 2025-06-09 Jihao Liu , Fanjun Meng , Lingyao Xie

In this paper the log surfaces without $\QQ$-complement are classified. In particular, they are non-rational always. This result takes off the restriction in the theory of complements and allows one to apply it in the most wide class of log…

Algebraic Geometry · Mathematics 2007-05-23 I. Yu. Fedorov , S. A. Kudryavtsev

We give an effective upper bound for the index of klt complements on toric Fano varieties.

Algebraic Geometry · Mathematics 2025-07-30 Florin Ambro

In this paper, we study the structure of Fano fibrations of varieties admitting an int-amplified endomorphism. We prove that if a normal $\mathbb{Q}$-factorial klt projective variety $X$ has an int-amplified endomorphism, then there exists…

Algebraic Geometry · Mathematics 2020-02-05 Shou Yoshikawa

We prove the Cone Theorem for algebraically integrable foliations. As a consequence, we show that termination of flips implies the b-nefness of the moduli part of a log canonical pair with respect to a contraction, generalising the case of…

Algebraic Geometry · Mathematics 2022-03-03 Florin Ambro , Paolo Cascini , Vyacheslav Shokurov , Calum Spicer

We prove existence of flips for log canonical foliated pairs of rank one on a Q-factorial projective klt threefold. This, in particular, provides a proof of the existence of a minimal model for a rank one foliation on a threefold for a…

Algebraic Geometry · Mathematics 2025-10-01 Paolo Cascini , Calum Spicer

This paper stresses the strong link between the existence of partial holomorphic connections on the normal bundle of a foliation seen as a quotient of the ambient tangent bundle and the extendability of a foliation to an infinitesimal…

Complex Variables · Mathematics 2015-01-14 Isaia Nisoli

We show that if $\mathcal{F}$ is an algebraically integrable foliation on a $\mathbb{Q}$-factorial normal projective variety $X$, $ A, B \geq 0$ are $\mathbb{Q}$-divisors on $X$ with $A$ ample such that $(\mathcal{F}, B)$ is foliated dlt…

Algebraic Geometry · Mathematics 2023-11-21 Priyankur Chaudhuri , Omprokash Das

The aim of this paper is to clarify and generalize techniques of works alg-geom/9711024 (see also math.AG/9810097 and math.AG/9901004). Roughly speaking, we prove that for local Fano contractions the existence of complements can be reduced…

Algebraic Geometry · Mathematics 2015-06-26 Yu. G. Prokhorov , V. V. Shokurov

We prove existence of flips, special termination, the base point free theorem and, in the case of log general type, the existence of minimal models for F-dlt foliated pairs of co-rank one on a $\mathbb Q$-factorial projective threefold. As…

Algebraic Geometry · Mathematics 2025-09-05 Paolo Cascini , Calum Spicer
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