Kenji Matsuki
This is a correction to the afore-mentioned paper in Duke Math. J. vol. 75 (1994), 99-119 by S. Keel, K. Matsuki, and J. McKernan. We completely rewrite Chapter 6 according to the original manuscript of the second author, in order to fix some crucial mistakes pointed out by Dr. Qihong Xie.
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Abundance for threefolds in positive characteristic
证明了特征大于42的三维簇的丰度猜想，解决了该情形下的关键问题。
We show the abundance theorem for arithmetic klt threefold pairs whose closed point have residue characteristic greater than five. As a consequence, we give a sufficient condition for the asymptotic invariance of plurigenera for certain families of singular surface pairs to hold in mixed characteristic.
Abundance for threefolds in positive characteristic when $ν=2$
本文证明了在正特征p>3的完美域k上，数值维数为2的三重拟正则对(X,B)中，K_X+B是半 ample 的。
Let X be a compact Kaehler threefold with terminal singularities such that K\_X is nef. We prove that K\_X is semiample.
On the Log Abundance for Compact {K{ä}hler} threefolds II
该研究证明了数值维数为2时，具nef对数典范除子的紧Kähler三维簇对的半丰沛性，结合前期工作完整解决了这类三维簇的对数丰度问题。
Note on the 3-dimensional log canonical abundance in characteristic $>3$
本文在特征 $>3$ 的代数闭域上证明了射影对数典范三维偶对的非消没性及丰度的若干特殊情形，并应用于对数典范环的有限生成及丰度成立的充分条件。
Minimal log discrepancies on a fixed threefold
本文证明任意固定三维簇上最小对数差异满足ACC，为三维簇奇点不变量的有界性提供结论。
We compute global log canonical thresholds of some smooth Fano threefolds.
Minimal log discrepancies on smooth threefolds
本文证明了光滑三维簇上极小对数差异的ACC，并推导出a-lc阈值ACC、一致m-adic半连续性及计算除子有界性等推论。
In this paper, we show that Fujita's basepoint-freeness conjecture for projective quasi-log canonical singularities holds true in dimension three. Immediately, we prove Fujita-type basepoint-freeness for projective semi-log canonical threefolds.
We prove the normality of minimal log canonical centers on threefold pairs which residue fields are perfect of residue characteristics $p\neq 2,3 $ and $5$. We also show that the union of all log canonical centers on threefold pairs with standard coefficients are seminormal provided that the residue characteristic is large enough. We provide an example of a non-seminormal log canonical center on a threefold in characteristic $3$, and give sufficient conditions to construct similar examples.
Log Sarkisov Program for strongly $\mathbb{Q}$-factorial compact Kähler threefolds
该研究为强$\mathbb{Q}$-factorial紧Kähler三维簇建立对数Sarkisov纲领，解决了该类簇的双有理几何核心问题。
We give a topological bound on the number of minimal models of a class of three dimensional log smooth pairs of general type.
We prove that the ACC conjecture for minimal log discrepancies holds for threefolds in $[1-δ,+\infty)$, where $δ>0$ only depends on the coefficient set. We also study Reid's general elephant for pairs, and show Shokurov's conjecture on the existence of $(ε,n)$-complements for threefolds for any $ε\geq 1$. As a key important step, we prove the uniform boundedness of divisors computing minimal log discrepancies for terminal threefolds. We show the ACC for threefold canonical thresholds, and that the set of accumulation points of threefold canonical thresholds is equal to $\{0\}\cup\{\frac{1}{n}\…
On smooth threefolds, the ACC for minimal log discrepancies is equivalent to the boundedness of the log discrepancy of some divisor which computes the minimal log discrepancy. We reduce it to the case when the boundary is the product of a canonical part and the maximal ideal to some power. We prove the reduced assertion when the log canonical threshold of the maximal ideal is either at most one-half or at least one.
We show that the minimal log discrepancy of any $\mathbb Q$-Gorenstein non-canonical threefold is $\leq\frac{12}{13}$, which is an optimal bound.
Erratum and addendum to the paper: Abundance for Kähler threefolds
本文勘误并补遗 Kähler 三维簇丰饶性定理，指出证明漏洞，并明确除“无正维子簇且非环面商”这一待定情形外定理仍成立。
Given a three-dimensional projective log canonical pair over a perfect field of characteristic larger than five, there exists a minimal model program that terminates after finitely many steps.
We prove Weak Borisov--Alexeev--Borisov Conjecture in dimension three which states that the anti-canonical volume of an $ε$-klt log Fano pair of dimension three is bounded from above.
We prove the base point free theorem for big line bundles on a three-dimensional log canonical projective pair defined over the algebraic closure of a finite field.
Let $(X,D)$ be log canonical pair such $\dim X = 3$ and the divisor $-(K_X + D)$ is nef and big. For a special class of such $(X,D)$'s we prove that the linear system $|-n(K_{X}+D)|$ is free for $n \gg 0$.
We show that many classical results of the minimal model programme do not hold over an algebraically closed field of characteristic two. Indeed, we construct a three dimensional plt pair whose codimension one part is not normal, a three dimensional klt singularity which is not rational nor Cohen-Macaulay, and a klt Fano threefold with non-trivial intermediate cohomology.
We prove a relative Kawamata Viehweg vanishing type theorem for birational morphisms. We use this to prove a Grauert Riemenschneider theorem over log canonical threefolds without zero dimensional log canonical centers, in residue characteristic p greater than five. In large enough residue characteristics, we prove a Grauert Riemenschneider theorem over threefold log canonical singularities with standard coefficients. These vanishing theorems can also be used to study the depth of log canonical singularities at non log canonical centers, as well as the singularities of the log canonical centers…
On explicit bounds of Fano threefolds
本文研究Fano三维流形的显式几何，找到可计算的正整数N使得除有界族外所有Fano三维流形有N-补，并给出多个代数不变量的首批显式下界及反典范体积的显式上界。
We correct the definitions and descriptions of the integral structures in [U14]. The previous flat basis in [ibid] is characterized by the Frobenius solutions and integral in the first approximation by mean of the graded quotients of monodromy filtration, but not integral in the strict sense. In this article, we use the integral structure of Iritani in [I11] for A-model. Using this precise version, we study open mirror symmetry for quintic threefolds through log mixed Hodge theory, especially the recent result on Neron models for admissible normal functions with non-torsion extensions in the j…
On base point free theorem and Mori dream spaces for log canonical threefolds over the algebraic closure of a finite field
本文在特征大于5时去除了大性条件，将有限域代数闭包上三维对数典范射影对的基点自由定理推广至一般线丛，并讨论了此类域上的Mori dream空间。
In this article we prove a fundamental inequality between Artin-Mazur heights and Yobuko heights of certain proper log smooth schemes of Cartier type over a fine log scheme whose underlying scheme is the spectrum of a perfect field $κ$ of characteristic $p>0$. We also prove that the cohomologies of Witt-sheaves of them are finitely generated ${\cal W}(κ)$-modules if the Yobuko heights of them are finite. As an application, we prove that the $p$-primary torsion parts of the Chow groups of codimension $2$ of proper smooth threefolds over $κ$ is of finite cotype if the Yobuko heights of them are …
We prove an analogue of Fujino and Mori's ``bounding the denominators'' in the log canonical bundle formula (see also Prokhorov and Shokurov) for Kawamata log terminal pairs of relative dimension one. As an application we prove that for a klt pair $(X,Δ)$ of Kodaira codimension one and dimension at most three such that the coefficients of $Δ$ are in a DCC set $\mathcal{A}$, there is a natural number $N$ that depends only on $\mathcal{A}$ for which the round down of $\N(K_X+Δ)$ induces the Iitaka fibration. We also prove a birational boundedness result for klt surfaces of general type.
The second largest accumulation point of the set of minimal log discrepancies of threefolds is $\frac{5}{6}$. In particular, the minimal log discrepancies of $\frac{5}{6}$-lc threefolds satisfy the ACC.
We prove the boundedness theorem for Fano threefolds with log-terminal singularities of any fixed index. This is an improvement of our earlier result, where we required additionally that the variety is Q-factorial, with Picard number 1. The new ideas of the paper include the following. 1. Using Alexeev Minimal Model program with suitable boundary to find horizontal extremal contractions. 2. Using Kollár's effective Base Point Freeness theorem. 3. Using Kawamata's result on the length of extremal curves with suitable boundary to avoid gluing curves in some cases.
We show that a weak version of the canonical bundle formula holds for fibrations of relative dimension one. We provide various applications thereof, for instance, using the recent result of Xu and Zhang, we prove the log non-vanishing conjecture for three-dimensional klt pairs over any algebraically closed field $k$ of characteristic $p>5$. We also show the log abundance conjecture for threefolds over $k$ when the nef dimension is not maximal, and the base point free theorem for threefolds over the algebraic closure of any finite field of characteristic $p>2$.
A generic Torelli Theorem for certain log Calabi--Yau threefolds
本文证明了满足特定纤维为环面对爆破且$H^3(Y,\mathbb{Z})=0$条件的光滑三维对数Calabi--Yau对的族的通用Torelli定理，并应用于Fano-LG对应中的Landau--Ginzburg模型。
The main purpose of this article is to prove that the family of all Fano threefolds with log-terminal singularities with bounded index is bounded.
We classify the non-toric, $\mathbb Q$-factorial, Gorenstein, log terminal Fano threefolds of Picard number one that admit an effective action of a two-dimensional algebraic torus.
We prove the $W\mathcal{O}$-rationality of klt threefolds and the rational chain connectedness of klt Fano threefolds over a perfect field of characteristic $p>5$. As a consequence, any klt Fano threefold over a finite field has a rational point.
The relative Clemens Conjectures for $\frac{1}{2}$-log Calabi-Yau threefolds
本文提出了1/2-log Calabi-Yau三维流形的相对Clemens猜想，并通过验证素Fano三维流形的框架，证明了相对Gromov-Witten理论的虚拟复杂性被抑制，从而实现了经典计数。
Boundedness of complements for log Calabi-Yau threefolds
本研究针对系数集为[0,1]的对数Calabi-Yau型簇，证明三维簇对若存在局部klt的ℝ-补集，则对应有限正整数集中的某个n有n-补集，同时证得ℝ-互补曲面对的补集有界性。
We compute global log canonical thresholds, or equivalently alpha invariants, of birationally rigid orbifold Fano threefolds embedded in weighted projective spaces as codimension two or three. As an important application, we prove that most of them are weakly exceptional, $K$-stable and admit Kähler--Einstien metric.
Let $(X,Δ)$ be an $n$-dimensional $ε$-klt log $\QQ$-Fano pair. We give an upper bound for the volume ${\rm Vol}(-(K_X+Δ))=(-(K_X+Δ))^n$ when $n=2$ or $n=3$ and $X$ is {$\QQ$-factorial} of $ρ(X)=1$. This bound is essentially sharp for $n=2$. Existence of an upper bound for anticanonical volumes is related the Borisov-Alexeev-Borisov Conjecture which asserts boundedness of the set of $ε$-klt log $\QQ$-Fano varieties of a given dimension $n$.
This work was initially motivated by Miranda's work on elliptic Weierstrass threefolds. Miranda [Mi] describes a smooth equidimensional (flat) model for any elliptic Weierstrass threefold; such models occur naturally in the study of moduli spaces. In this paper we use minimal model theory to link birational maps of log surfaces (log contractions) to equidimensional fibrations of elliptic threefolds. As a corollary we show that an elliptic fibration of positive Kodaira dimension has a minimal model with an equidimensional birationally equivalent elliptic fibration satisfying certain good proper…
Let $S$ be a complete intersection of a smooth quadric 3-fold $Q$ and a hypersurface of degree $d$ in ${\mathbb P}^4$. In this paper we analyze GIT stability of $S$ with respect to the natural $G=SO(5, {\mathbb C})$-action. We prove that if $d\ge 4$ and $S$ has at worst semi-log canonical singularities then $S$ is $G$-stable. Also, we prove that if $d\ge 3$ and $S$ has at worst semi-log canonical singularities then $S$ is $G$-semistable.
The aim of this survey paper is threefold: (a) to discuss the status of the Morrison-Kawamata cone conjecture, (b) to report on recent developments towards the Abundance Conjecture, and (c) to discuss the nef line bundle version of the Abundance Conjecture on $K$-trivial varieties.
Log Canonical Minimal Model Program for corank one foliations on Threefolds
本文研究了三重形上秩为一的叶形的Log Canonical极小模型程序，证明了通过运行$(K_\mcF+\Delta)$-MMP可以得到极小模型或Mori纤维空间，并探讨了极小模型之间的连接及有限数量性质。
Integral points of bounded height on a log Fano threefold
本研究借助万有挠子方法，推导得出射影空间$\u2119^3$在特定平面外的胀开簇上，有界高度整点计数的渐近公式，为对数法诺三维簇整点分布研究提供结果。
On The Log Sarkisov Program For Foliations On Projective 3-Folds
本文证明了具有适当奇点的投影三重曲面上协秩为一的叶状结构的Sarkisov程序，并展示了两个具有秩一叶状结构的叶状Mori纤维空间之间的弱化理性刚性。
In this article we present a refinement of the base point free theorem for threefolds in positive characteristic. If $L$ is a nef Cartier divisor of numerical dimension at least one on a projective Kawamata log terminal threefold $(X,Δ)$ over a perfect field $k$ of characteristic $p \gg 0$ such that $L-(K_X+Δ)$ is big and nef, then we show that the linear system $|mL|$ is base point free for all sufficiently large integer $m>0$.
On the MMP for rank one foliations on threefolds
本文证明 Q-因子射影 klt 三维簇上秩一对数典范叶状配对存在翻转，从而推广了三维秩一叶状结构极小模型的存在性结果。
Abundance for semi log canonical compact Kähler threefolds
本文展示紧 Kähler 变量在三维时半 log canonical 丰度失效，构造了反例表明 K_X 非负但 κ 为零，而 K_X 不是半 ample。同时证明若起始为紧 Kähler 半 dlt 对，则丰度成立。
Abundance of affine algebraic structures on stabilized cotangent bundles of surfaces
该研究针对亏格$g\geq2$的定向曲面稳定余切丛，构造了不可数多个互不同构且与$T^\ast\Sigma_g\times\mathbb{C}$ Stein形变等价的光滑仿射三维流形，其族由$(6g-7)$维复orbifold参数化，解答了Ivan Smith的问题。
On Gorenstein $\mathbb{Q}_p$-rational threefold and fourfold singularities
本文证明对于$n\leq 4$且$p>5$，拟Gorenstein $F$-纯且$\mathbb{Q}_p$-有理$n$维奇点是典范的，基于对对数典范奇点dlt修正的对偶复形的分析。
Bogomolov-Gieseker inequality for log terminal Kähler threefolds
本文研究具有对数终端奇性的三维紧 Kähler 空间，为稳定 $\mathbb Q$-层建立了 Bogomolov-Gieseker 不等式的 orbifold 版本。
Iitaka fibrations and integral points: a family of arbitrarily polarized spherical threefolds
针对一族球面对数 Fano 三重 Fold 研究 Manin 纲领，确定任意丰富线丛高度有界整点的渐近数量，证实 Santens 猜想并推进饭高纤维化对数类比的理解。
We prove the abundance theorem for numerically trivial log canonical divisors of log canonical pairs and semi-log canonical pairs.
Non-minimal Elliptic Threefolds at Infinite Distance I: Log Calabi-Yau Resolutions
本文研究椭圆 Calabi-Yau 三维流形在无穷距离极限下的退化，通过基座爆破解消非极小米型奇点，得到对数 Calabi-Yau 空间并分析其几何与 F-理论规范代数。
General hyperplane sections of log canonical threefolds in positive characteristic
本文证明了在特征 $p>3$ 的代数闭域上，仅有对数典范或 klt 奇点的三维拟射影簇的一般超平面截面同样具有相应奇点，并给出了曲面奇点为几何对数典范或几何 klt 的充分条件。
Abundance theorem for log surfaces
该论文在不假设Q-因子性或对数典范性的条件下，证明了对数曲面的丰沛定理，推广了已有结果。
On the Iitaka volumes of log canonical surfaces and threefolds
该研究证明三维及以下对数典范对的Iitaka体积集合在系数集满足降链条件时也满足该条件，刻画了低维特定曲面的Iitaka体积集性质，部分证实了高维klt对的相关猜想。
Log Calabi-Yau structure of projective threefolds admitting polarized endomorphisms
针对Broustet和Gongyo提出的容许极化自同态的正规射影簇为Calabi-Yau型的猜想，研究者基于等变极小模型纲领与典范丛公式建立框架，证明了光滑射影三维簇情形下该猜想成立。
We prove the abundance theorem for semi log canonical surfaces in positive characteristic.
We prove the abundance theorem for log canonical $n$-folds such that the boundary divisor is big assuming the abundance conjecture for log canonical $(n-1)$-folds. We also discuss the log minimal model program for log canonical $4$-folds.
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