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We give a topological bound on the number of minimal models of a class of three dimensional log smooth pairs of general type.

Algebraic Geometry · Mathematics 2015-01-20 Paolo Cascini , Vladimir Lazić

In this paper, we discuss a proof of existence of log minimal models or Mori fibre spaces for klt pairs $(X/Z,B)$ with $B$ big$/Z$. This then implies existence of klt log flips, finite generation of klt log canonical rings, and most of the…

Algebraic Geometry · Mathematics 2009-04-21 Caucher Birkar , Mihai Paun

We study relative log canonical pairs with relatively trivial log canonical divisors. We fix such a pair $(X,\Delta)/Z$ and establish the minimal model theory for the pair $(X,\Delta)$ assuming the minimal model theory for all Kawamata log…

Algebraic Geometry · Mathematics 2017-11-21 Kenta Hashizume

Varieties with log terminal and log canonical singularities are considered in the Minimal Model Program, see \cite{...} for introduction. In \cite{shokurov:hyp} it was conjectured that many of the interesting sets, associated with these…

alg-geom · Mathematics 2015-06-30 Valery Alexeev

In this paper, we prove the rational coefficient case of the global ACC for foliated threefolds. Specifically, we consider any lc foliated log Calabi-Yau triple $(X,\mathcal{F},B)$ of dimension $3$ whose coefficients belong to a set…

Algebraic Geometry · Mathematics 2023-11-29 Jihao Liu , Yujie Luo , Fanjun Meng

In this paper, we study the minimal model theory for threefolds in mixed characteristic. As a generalization of a result of Kawamata, we show that the MMP holds for strictly semi-stable schemes over an excellent Dedekind scheme $V$ of…

Algebraic Geometry · Mathematics 2023-01-09 Teppei Takamatsu , Shou Yoshikawa

In this paper, we study the adjoint foliated structures of the form $K_{\mathcal{F}}+D$ on algebraic surfaces, with particular focus on their minimal and canonical models. We investigate the effective behavior of the multiple linear system…

Algebraic Geometry · Mathematics 2025-05-26 Jun Lu , Xiaohang Wu , Shi Xu

We establish the Minimal Model Program for arithmetic threefolds whose residue characteristics are greater than five. In doing this, we generalize the theory of global $F$-regularity to mixed characteristic and identify certain stable…

Algebraic Geometry · Mathematics 2022-12-07 Bhargav Bhatt , Linquan Ma , Zsolt Patakfalvi , Karl Schwede , Kevin Tucker , Joe Waldron , Jakub Witaszek

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

We give a classification of the log canonical models of elliptic surface pairs consisting of an elliptic fibration, a section, and a weighted sum of marked fibers. In particular, we show how the log canonical models depend on the choice of…

Algebraic Geometry · Mathematics 2017-09-13 Kenneth Ascher , Dori Bejleri

We show that many statements of the Minimal Model Program, including the cone theorem, the base point free theorem and the existence of Mori fibre spaces, fail for 1-foliated surface pairs $(X,\mathcal{F})$ with canonical singularities in…

Algebraic Geometry · Mathematics 2024-01-10 Fabio Bernasconi

In this paper, we investigate properties of potential triples $(X,\Delta,D)$ which consists of a pair $(X,\Delta)$ and a pseudoeffective $\mathbb{R}$-Cartier divisor $D$. In particular, we show that if $D$ admits a birational Zariski…

Algebraic Geometry · Mathematics 2025-02-04 Sung Rak Choi , Sungwook Jang , Dae-Won Lee

Let $(X,\Delta)$ be a normal pair with a projective morphism $X \to Z$ and let $A$ be a relatively ample $\mathbb{R}$-divisor on $X$. We prove the termination of some minimal model program on $(X,\Delta+A)/Z$ and the abundance conjecture…

Algebraic Geometry · Mathematics 2025-10-21 Kenta Hashizume

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

There are two main examples where a version of the Minimal Model Program can, at least conjecturally, be performed successfully: the first is the classical MMP associated to the canonical divisor, and the other is Mori Dream Spaces. In this…

Algebraic Geometry · Mathematics 2021-05-18 Anne-Sophie Kaloghiros , Alex Küronya , Vladimir Lazić

This paper studies the birational geometry of terminal Gorenstein Fano 3-folds. If Y is not Q-factorial, in most cases, it is possible to describe explicitly the divisor class group Cl Y by running a Minimal Model Program (MMP) on X, a…

Algebraic Geometry · Mathematics 2009-08-04 Anne-Sophie Kaloghiros

We show that given any two minimal models of a generalized lc pair, there exist small birational models which are connected by a sequence of symmetric flops. We also present some applications.

Algebraic Geometry · Mathematics 2023-06-27 Priyankur Chaudhuri

We consider the minimal model program for varieties that are not Q-factorial. We show that, in many cases, its steps are simpler than expected. In particular, all flips are 1-complemented. The main applications are to log terminal…

Algebraic Geometry · Mathematics 2021-02-02 János Kollár

This paper resolves several outstanding questions regarding the Minimal Model Program for klt threefolds in mixed characteristic. Namely termination for pairs which are not pseudo-effective, finiteness of minimal models and the Sarkisov…

Algebraic Geometry · Mathematics 2024-02-21 Liam Stigant

In this paper, we classify del Pezzo foliations on projective manifolds of rank at least 3 and with log canonical singularities in the sense of McQuillan.

Algebraic Geometry · Mathematics 2021-10-07 João Paulo Figueredo