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We show the validity of the Minimal Model Program for threefolds in characteristic five.

Algebraic Geometry · Mathematics 2019-12-02 Christopher Hacon , Jakub Witaszek

We study log canonical models of foliated surfaces of general type. In particular, we show that log canonical models of general type and their minimal partial du Val resolutions are bounded. Moreover, we show the valuative criteria of…

Algebraic Geometry · Mathematics 2022-02-25 Yen-An Chen

We give cohomological criteria for logarithmic good reduction of elliptic surfaces up to modification. Along the way, we prove several more general results about such surfaces in positive characteristic, as well as about log smooth…

Algebraic Geometry · Mathematics 2022-12-05 Otto Overkamp , Arne Smeets

In this work we describe a minimal log-resolution of an ideal in a smooth complex surface from the minimal log-resolution of its generators.

Algebraic Geometry · Mathematics 2017-01-17 Maria Alberich-Carramiñana , Josep Alvarez Montaner , Guillem Blanco

We classify del Pezzo non-commutative surfaces that are finite over their centres and have no worse than canonical singularities. Using the minimal model program, we introduce the minimal model of such surfaces. We first classify the…

Algebraic Geometry · Mathematics 2020-02-13 Amir Nasr

We compare the minimal model of a log canonical pair with the minimal model of its reduced boundary. These results are then used to study the existence of the minimal model of a semi-log-canonical pair using its normalization.

Algebraic Geometry · Mathematics 2017-09-13 Florin Ambro , János Kollár

The aim of this paper is to propose a strategy to implement the Minimal Model Program in modern computer algebra systems.

Algebraic Geometry · Mathematics 2025-08-22 Vladimir Lazić

We give a classification of the dual graphs of the exceptional divisors on the minimal resolutions of log canonical foliation singularities on surfaces. For an application, we show the set of foliated minimal log discrepancies for foliated…

Algebraic Geometry · Mathematics 2021-04-02 Yen-An Chen

Using techniques from the theory of foliations, we establish the cone theorem and the contraction theorem for lc generalized pairs in full generality, and meanwhile develop the minimal model program for $\mathbb Q$-factorial foliated dlt…

Algebraic Geometry · Mathematics 2026-05-29 Guodu Chen , Jingjun Han , Jihao Liu , Lingyao Xie

This paper is an announcement of the minimal model theory for log surfaces in all characteristics and contains some related results including a simplified proof of the Artin-Keel contraction theorem in the surface case.

Algebraic Geometry · Mathematics 2012-05-14 Osamu Fujino , Hiromu Tanaka

In this article we show that the Log Minimal Model Program for $\mathbb{Q}$-factorial dlt pairs $(X, B)$ on a compact K\"ahler $3$-fold holds. More specifically, we show that after finitely many divisorial contractions and flips we obtain…

Algebraic Geometry · Mathematics 2024-04-10 Omprokash Das , Christopher Hacon

We describe the foundation of the log minimal model program for log canonical pairs according to Ambro's idea. We generalize Koll\'ar's vanishing and torsion-free theorems for embedded simple normal crossing pairs. Then we prove the cone…

Algebraic Geometry · Mathematics 2009-07-10 Osamu Fujino

Let $f:(X,B)\to Z$ be a 3-fold extremal dlt flipping contraction defined over an algebraically closed field of characteristic $p>5$, such that the coefficients of $\{B\}$ are in the standard set $\{1-\frac 1n|n\in \mathbb N\}$, then the…

Algebraic Geometry · Mathematics 2013-06-28 Christopher D. Hacon , Chenyang Xu

We construct an algorithm for the minimal model program in dimension three over the field of algebraic numbers. As auxiliary results, we also construct algorithms for computing bigraded global Hom modules and for computing Stein…

Algebraic Geometry · Mathematics 2026-04-07 Takehiko Yasuda

In this note, we construct nine families of projective complex minimal surfaces of general type having the canonical map of degree 8 and irregularity 0 or 1. For six of these families the canonical system has a non trivial fixed part.

Algebraic Geometry · Mathematics 2019-08-30 Nguyen Bin

This is the second of a series of papers studying real algebraic threefolds using the minimal model program. The main result is the following. Let $X$ be a smooth projective real algebraic 3-fold. Assume that the set of real points is an…

alg-geom · Mathematics 2007-05-23 János Kollár

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

We introduce linearly decomposable (LD) generalized pairs, which serve as a workable substitute for rational decompositions in the non-NQC setting. Using LD generalized pairs, together with a refinement of special termination and…

Algebraic Geometry · Mathematics 2026-03-05 Zhengyu Hu , Jihao Liu

We show the existence of prime divisors computing minimal log discrepancies in positive characteristic except for a special case. Moreover we prove the lower semicontinuity of minimal log discrepancies for smooth varieties in positive…

Algebraic Geometry · Mathematics 2019-12-11 Kohsuke Shibata

Given an NQC log canonical generalized pair $(X,B+M)$ whose underlying variety $X$ is not necessarily $\mathbb{Q}$-factorial, we show that one may run a $(K_X+B+M)$-MMP with scaling of an ample divisor which terminates, provided that…

Algebraic Geometry · Mathematics 2025-09-19 Nikolaos Tsakanikas , Lingyao Xie