Alvaro Bustinduy
We extend the classification of complete polynomial vector fields on C^2 given by Marco Brunella (Topology 43(2): 433-445, 2004) to cover the case of holomorphic (non-polynomial) vector fields whose underlying foliation is however still polynomial.
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Surface Foliations with Compact complex leaves are holomorphic
设X是具有实叶理的紧致复曲面。如果所有的叶都是紧致复曲线，则叶理必须是全纯的。
In this paper we provide sufficient conditions for maps of vector bundles on smooth projective varieties to be uniquely determined by their degeneracy schemes. We then specialize to holomorphic distributions and foliations. In particular, we provide sufficient conditions for distributions of arbitrary rank on projective spaces to be uniquely determined by their singular schemes.
Let $X$ be an irreducible holomorphic symplectic fourfold and $D$ a smooth hypersurface in $X$. It follows from a result by Amerik and Campana that the characteristic foliation (that is the foliation given by the kernel of the restriction of the symplectic form to $D$) is not algebraic unless $D$ is uniruled. Suppose now that the Zariski closure of its general leaf is a surface. We prove that $X$ has a lagrangian fibration and $D$ is the inverse image of a curve on its base.
Let $C$ be a smooth elliptic curve embedded in a smooth complex surface $X$ such that $C$ is a leaf of a suitable holomorphic foliation of $X$. We investigate complex analytic properties of a neighborhood of $C$ under some assumptions on complex dynamical properties of the holonomy function. As an application, we give an example of $(C, X)$ in which the line bundle $[C]$ is formally flat along $C$ however it does not admit a $C^\infty$ Hermitian metric with semi-positive curvature.
Holomorphic foliations of degree four on the complex projective space
研究复射影空间上四次全纯叶状结构的结构分类，并对高阶射流的 $d\geq4$ 次叶状结构证明其必属于横截仿射、横截射影或有理拉回三种情形之一。
Stability of Holomorphic Foliations with Split Tangent Sheaf
证明了具有分裂切层且具有好奇异集的射影空间的奇异全纯叶理集在全纯叶理空间中是开的。作为应用，我们推广了Camacho-Lins Neto关于线性拉回叶理的一个结果，给出了余维$k \ge 2$的$\mathcal L$ -叶理的刚性的一个判别准则，并证明了Cerveau-Litti关于$\mathbb P^4$的余维1的$\mathcal L$ -叶理的刚性的一个猜想.这些结果使我们能够展示一些以前未知的奇异全纯叶理空间的不可约分量。
In this paper we study transversely holomorphic foliations of complex codimension one with some hypothesis on the transverse structure.
Formulae for indices of holomorphic foliations via reduction of singularities
本文通过奇点约简过程，推导出全纯叶系的多种指标公式，包括歧变向量、Milnor数、经典指数等，并统一了相关理论框架。
Let $X$ be a compact Kähler manifold and $α$ be a class in the Dolbeault cohomology class of bidegree $(1, 1)$ on $X$. When the numerical dimension of $α$ is one and $α$ admits at least two smooth semi-positive representatives, we show the existence of a family of real analytic Levi-flat hypersurfaces in $X$ and a holomorphic foliation on a suitable domain of $X$ along whose leaves any semi-positive representative of $α$ is zero. As an application, we give the affirmative answer to \cite[Conjecture 2.1]{K2019} on the relation between the semi-positivity of the line bundle $[Y]$ and the analyti…
We classify nonsingular holomorphic foliations of dimension and codimension one on certain Hopf manifolds. More general, we prove that all nonsingular codimension one distributions on intermediary or generic Hopf manifolds are integrable and has holomorphic integral first. Also, we prove some results about singular holomorphic distributions on Hopf manifolds.
We show that the topological equivalence class of holomorphic foliation germs with an isolated singularity of Poincaré type is determined by the topological equivalence class of the real intersection foliation of the (suitably normalized) foliation germ with a sphere centered in the singularity. We use this Reconstruction Theorem to completely classify topological equivalence classes of plane holomorphic foliation germs of Poincaré type and discuss a conjecture on the classification in dimension $\geq 3$.
We study holomorphic foliations tangent to singular real-analytic Levi-flat hypersurfaces in compact complex manifolds of complex dimension two. We give some hypotheses to guarantee the existence of dicritical singularities of these objects. As consequence, we give some applications to holomorphic foliations tangent to real-analytic Levi-flat hypersurfaces with singularities in $\mathbb{P}^2$.
On the dynamics of codimension one holomorphic foliations with ample normal bundle
本文研究了法丛充足的余维1叶理的叶到奇点的积累问题，重点讨论了Levi-平坦超曲面的不存在性。
It is shown that the Levi foliation of a real analytic Levi-flat hypersurface extends to a $d$-web near a nondicritical singular point and admits a multiple-valued meromorphic first integral.
We classify nonsingular holomorphic distributions of arbitrary codimension on certain Hopf manifolds. We prove that all holomorphic distribution of codimension k on a generic Hopf manifold is induced by a mononial holomorphic k-form.
We consider closed positive currents invariant by a singular holomorphic foliation on an algebraic surface. We show that under some conditions the foliation must leave invariant an algebraic curve.
We study those real $\mathcal{C}^\infty$ foliations in complex surfaces whose leaves are holomorphic curves. The main motivation is to try and understand these foliations in neighborhoods of curves: can we expect the space of foliations in a fixed neighborhood to be infinite-dimensional, or are there some contexts under which every such foliation is holomorphic? We give some restrictions and study in more details the geometry of foliations whose leaves belong to a holomorphic family of holomorphic curves. In particular, we classify all real-analytic foliations on neighborhoods of curves which …
On the topological invariance of the algebraic multiplicity of holomorphic foliations
本文研究全纯叶层代数重数的拓扑不变性，证明二维下重数为1是拓扑不变量并推广至高维，验证多类叶层的不变性，还修正了Rosas-Bazan的相关结论。
We prove that a transversely holomorphic foliation which is transverse to the fibers of a fibration, is a Seifert fibration if the set of compact leaves is not of zero measure. Similarly, we prove that a finitely generated subgroup of holomorphic diffeomorphisms of a connected complex manifold, is finite provided that the set of periodic orbits is not of zero measure.
In this work we prove a Baum-Bott type residue theorem for flags of holomorphic foliations. We prove some relations between the residues of the flag and the residues of their correspondent foliations. We define the Nash residue for flags and we give a partial answer to the Baum-Bott type rationality conjecture in this context .
We consider a holomorphic foliation $\mathcal{F}$ of codimension $k\geq 1$ on a homogeneous compact Kähler manifold $X$ of dimension $n>k$. Assuming that the singular set $Sing(\mathcal{F})$ of $\mathcal{F}$ is contained in an absolutely $k$-convex domain $U\subset X$, we prove that the determinant of normal bundle $\det(N_{\mathcal{F}})$ of $\mathcal{F}$ cannot be an ample line bundle, provided $[n/k]\geq 2k+3$. Here $[n/k]$ denotes the largest integer $\leq n/k.$
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 neighborhood of a submanifold. We find the obstructions to extendability and thanks to the theory developed we obtain some new Khanedani-Lehmann-Suwa type index theorems.
We show that the open unit ball $\mathbb{B}^n$ of $\mathbb{C}^n$ $(n>1)$ admits a nonsingular holomorphic foliation by complete properly embedded holomorphic discs.
We study holomorphic foliations of codimension $k\geq 1$ on a complex manifold $X$ of dimension $n+k$ from the point of view of the exceptional minimal set conjecture. For $n\geq 2$ we show in particular that if the holomorphic normal bundle $N_{\mathcal{F}}$ is Griffiths positive, then the foliation does not admit a compact invariant set that is a complete intersection of $k$ smooth real hypersurfaces in $X$.
We present enumerative results for holomorphic foliations by curves on $\mathbb{P}^n$, $n\geq 3$, with singularities of positive dimension. Some of the results presented improve previous ones due to Corrêa--Fernández-Pérez--Nonato Costa--Vidal Martins and Nonato Costa. We also present an enumerative result bounding the number of isolated singularities in a projective subvariety invariant by a holomorphic foliation by curves on $\mathbb{P}^n$ with a singularity of positive dimension.
We present a list of open questions in the theory of holomorphic foliations, possibly with singularities. Some problems have been around for a while, others are very accessible.
Indices of holomorphic foliations and the bifurcation conjecture
本文基于例外除子相交矩阵的Cholesky型分解，为奇异全纯叶状结构的局部不变量提供了半全局公式，并以此完全证明了A. Szawlowski关于平面全纯芽铅笔的分岔猜想。
A non-existence theorem for Morse type holomorphic foliations of codimension one transverse to spheres
证明了复仿射空间中余维为1的Morse型全纯叶理不横截于球面。此外，我们的特点是各种接触的线性叶理与同心球。
We study Segre varieties associated to Levi-flat subsets in complex manifolds and apply them to establish local and global results on the integration of tangent holomorphic foliations.
We study codimension one holomorphic foliations on complex projective spaces and compact manifolds under the assumption that the foliation has a projective transverse structure in the complement of some invariant codimension one analytic subset. The basic motivation is the characterization of pull-backs of Riccati foliations on projective spaces. Our techniques apply to give a description of the generic models of codimension one foliations on compact manifolds of dimension $\ge 3$.
We prove inequalities relating the degrees of holomorphic distributions and of holomorphic foliations forming a flag on $\mathbb{P}^n$. Such inequalities are inspired by the so called Poincaré problem for foliations.
Unlikely intersections of codimension one foliations
该研究聚焦复射影流形上的奇异全纯叶状结构族，探究其整体相交所定义的余维数意外偏低的叶状结构，推进了复几何与代数几何领域的叶状结构相交理论研究。
Projective varieties invariant by one-dimensional foliations
本文研究了P^n的一维全纯叶理的示性数与其不变量代数簇的示性数之间的关系。更准确地说：如果M是连通复流形，则M的一维全纯叶状F是态射Φ：L -> TM，其中L是M上的全纯线丛。F的奇异集是解析子簇sing（F）= {p：Φ（p）=0}，F的叶是F在M-sing（F）上诱导的非奇异叶理的叶。若M是P^n，则由于P^n上的线丛在H^2（P^n，Z）= Z中由Chern类c_1（L）分类，P^n的一维全纯叶理F由态射Phi：O（1-d）-> TP^n给出，其中d >= 0，d在Z中，我们称之为F的度。我们将用符号F^d表示这样的叶理。现在假设i：V -> P^n是一个不可约代数簇，F^d不变量，使得F^d到V的拉回i^*（F^d）有一个有限集作为奇异集。我们要解决的问题是d和V的次数之间的关系。
Index theorems for holomorphic maps and foliations
我们描述了一个一般的建设提供指标定理本地化的陈类的正规丛的一个子簇内的复流形。作为我们的建设的特殊情况下，我们恢复Lehmann-Suwa的推广经典Camacho-Sad指标定理的全纯叶理和我们的指标定理的全纯映射的正维不动点集。此外，我们还获得了最近的指标定理Camacho-Movasati-Sad和Camacho-Lehmann的全纯叶理横截一个子簇。
Nilpotent Holomorphic Foliations on $(\mathbb{C}^n,\mathbf{0})$
本文研究复数维$(\mathbb{C}^n,\mathbf{0})$上的nilpotent光滑叶结构，通过分析其与Takens正常型的关系，提出新的准则以判断叶结构是否为广义超曲面类型。
Foliations on complex projective surfaces
这些是2002年2月在比萨的一门课程的讲稿。它们提供了紧Kaehler曲面上的非一般类型的全纯叶理的分类。
Hyperbolicity of holomorphic foliations with parabolic leaves
本文研究了具有1维抛物叶的双曲叶理的双曲性概念，即沿从$\D^{n-1} \times \C$到将每个$\{*\} \times \C$发送到一个叶的流形的叶理-全纯映射的全纯柱的不存在性.我们构造了一个张量，它是一个在叶状流形上的丛的叶向全纯截面，它在一个开饱和集上为零当且仅当存在一个通过这个开集的每一点的圆柱。由于这一研究，我们证明了紧叶饱和的开集是沿叶理的全纯圆柱的并集。在紧致流形、有一个紧致叶的叶理和没有紧致叶的叶理的情况下，我们也给出了一些更具体的结果和例子。
Let $\mathcal{F}$ be written as $ f^{*}(\mathcal{G})$, where $\mathcal{G}$ is a $1$-dimensional foliation on $ {\mathbb P^{n-1}}$ and $f:{\mathbb P^n}--->{\mathbb P^{n-1}}$ a non-linear generic rational map. We use local stability results of singular holomorphic foliations, to prove that: if $n\geq 4$, a foliation $\mathcal{F}$ by complex surfaces on $\mathbb P^n$ is globally stable under holomorphic deformations. As a consequence, we obtain irreducible components for the space of two-dimensional foliations in $\mathbb P^n$. We present also a result which characterizes holomorphic foliations o…
We consider the problem of extending germs of plane holomorphic foliations to foliations of compact surfaces. We show that the germs that become regular after a single blow up and admit meromorphic first integrals can be extended, after local changes of coordinates, to foliations of compact surfaces. We also show that the simplest elements in this class can be defined by polynomial equations. On the other hand we prove that, in the absence of meromorphic first integrals there are uncountably many elements without polynomial representations.
The purpose of this paper is the study of vanishing cycles in holomorphic foliations by complex curves on compact complex manifolds. The main result consists in showing that a vanishing cycle comes together with a much richer complex geometric object - we call this object a foliated shell.
Global Stability for Holomorphic Foliations in Kaehler Manifolds
证明了紧致复Kaehler流形中的全纯叶解的如下定理：如果存在具有有限完整性的紧致叶，则每个叶都是具有有限完整性的紧致叶。作为推论，我们重新获得了Edwards-Millett-Sullivan和Hollman关于Kaehler流形中紧叶理的稳定性定理.
Transversely Lie holomorphic foliations on projective spaces
证明了在射影空间上具有一般奇异性的一维叶理，在余维为1的代数子集的补中具有李群横截结构，是对数的，即，它是由具有单极点的闭一形式给出的余维一叶理的交集。如果在一个合适的仿射空间中只有一个奇点，则叶理是由一个线性对角向量场诱导的。
We define the Milnor number -- as the intersection number of two holomorphic sections -- of a one-dimensional holomorphic foliation $\mathscr{F}$ with respect to a compact connected component $C$ of its singular set. Under certain conditions, we prove that the Milnor number of $\mathscr{F}$ on a three-dimensional manifold with respect to $C$ is invariant by $C^1$ topological equivalences.
Holomorphic foliations tangent to Rolle-pfaffian hypersurfaces
本文研究复平面原点处满足Rolle-Khovanskii条件的与Pfaffian超曲面相切的全纯叶状结构芽，证明其由闭亚纯1-形式定义，并完成奇点消解中简单模型的分类。
In dimensions greater than or equal to 3, the local structure of a singular holomorphic foliation conceals a globally defined foliation on the projective space of dimension one less. In this paper, we will discuss how the global dynamics of the latter foliation exerts influence on several problems that apparently have a purely local nature. In the course of the discussion, a few recent results and open problems in the area will be reviewed as well.
Commuting holonomies and rigidity of holomorphic foliations
本文研究了复平面上具有一般非有理首次积分的全纯叶理的变形。考虑首次积分的正则纤维中的两个消失环，它们具有非零的自相交，且消失路径仅在它们的起点相交。证明了如果这类消失圈的变形完整性可交换，则变形叶理也有一个首次积分。我们的结果推广了Ilyashenko关于具有持久中心奇点的全纯叶理的刚性的一个类似结果。证明的主要工具是Picard-Lefschetz理论和这种变形的迭代积分理论。
These are the notes of a series of lectures delivered by the author at the Graduate School of Mathematics of the University of Tokyo, during the month of October 2015. They were meant to be as self-contained as possible, taking into account time and space. The basic idea was to introduce the concepts and some of the basic results in the theory of holomorphic foliations with singularities. Another goal is to guide the reader to some of the recent questions and problems in the field, providing in this way a motivating introduction to those who are interested in studying a new subject.
Heat diffusions on holomorphic foliations with non-degenerate singularities
本文研究紧复流形上带非退化奇点的 Brody 双曲全纯叶状结构，证明叶状热扩散与抽象热扩散一致，并由此得出抽象热扩散的唯一性。
The Schwartz index and the residue of logarithmic foliations along a hypersurface with isolated singularities
本文证明了对数叶状结构沿孤立奇点超曲面的Baum-Bott型公式，用Schwartz指数表达留数，并推广了Poincaré问题的障碍结果至任意偶数维射影空间。
We describe the basic cohomology ring of the canonical holomorphic foliation on a moment-angle manifold, LVMB-manifold or any complex manifold with a maximal holomorphic torus action. Namely, we show that the basic cohomology has a description similar to the cohomology ring of a complete simplicial toric variety due to Danilov and Jurkiewicz. This settles a question of Battaglia and Zaffran, who previously computed the basic Betti numbers for the canonical holomorphic foliation in the case of a shellable fan. Our proof uses an Eilenberg-Moore spectral sequence argument; the key ingredient is t…
Poincaré metric of holomorphic foliations with non-degenerate singularities
本文研究紧复流形上具有非退化奇点的布罗迪双曲叶层，证明其叶向庞加莱度量在奇点集附近具有带对数斜率的横向赫尔德连续性。
We study germs of holomorphic distributions with "separated variables'. In codimension one, a well know example of this kind of distribution is given by the canonical contact structure on $\mathbb{P}^{2m+1}$ . Another example is the Darboux distribution, which gives the normal local form of any contact structure. Given a germ $D$ of holomorphic distribution with separated variables in $(\mathbb{C}^n,0)$, we show that there exists , for some $κ\in \mathbb{Z}_{\geq 0}$ related to the Taylor coefficients of $D$, a holomorphic submersion $H_{D}: (\mathbb{C}^n,0) \rightarrow (\mathbb{C}^κ,0)$ such …
Let $\mathcal{F}$ be written as $ f^{*}\mathcal{G}$, where $\mathcal{G}$ is a foliation in $ {\mathbb P^2}$ with three invariant lines in general position, say $(XYZ)=0$, and $f:{\mathbb P^n}--->{\mathbb P^2}$, $f=(F^α_{0}:F^β_{1}:F^γ_{2})$ is a nonlinear rational map. Using local stability results of singular holomorphic foliations, we prove that: if $n\geq 3$, the foliation $\mathcal{F}$ is globally stable under holomorphic deformations. As a consequence we obtain new irreducible componentes for the space of codimension one foliations on $\mathbb P^n$. We present also a result which characte…
Stability of closed leaves holomorphic foliations via torsion behavior of groups of germs
本文通过引入胚群扭转轨迹，证明了闭叶全纯叶状结构中存在高维紧致叶不变解析集，且叶体积一致有界，并给出射影情形的全局化。
We give a classification of pairs (F, f) where F is a holomorphic foliation on a projective surface and f is a non-invertible dominant rational map preserving F. We prove that both the map and the foliation are integrable in a suitable sense.
Finiteness of hyperbolic entropy for holomorphic foliations with non-degenerate singularities
本文研究了具有非退化奇点的全纯叶系的超几何熵有限性问题，证明其熵值为有限。
This article studies germs of holomorphic vector fields at the origin of C3 that are tangent to holomorphic foliations of codimension one. Two situations are considered. First, we assume hypotheses on the reduction of singularities of the vector field - for instance, that the final models belong to a family of vector fields whose linear parts have eigenvalues satisfying a condition of non-resonance - in order to conclude that the foliation is of complex hyperbolic type, that is, without saddle-nodes in its reduction of singularities. In the second part, we prove that a vector field that is tan…
Let $\mathcal{F}$ be a holomorphic foliation by curves defined in a neighborhood of $0$ in $\mathbb{C}^n$ ($n\geq 2$) having $0$ as a weakly hyperbolic singularity. Let $T$ be a positive harmonic current directed by $\mathcal{F}$ which does not give mass to any of the $n$ coordinate invariant hyperplanes $\{z_j=0\}$ for $1\leq j\leq n.$ Then we show that the Lelong number of $T$ at $0$ vanishes. Moreover, an application of this local result in the global context is given. We discuss also the relation between several basic notions such as directed positive harmonic currents, directed positive d…
Topological rigidity for holomorphic foliations
研究复射影平面$\mathbb{C}P(2)$上全纯叶理的解析变形与开折。设$\{\mathcal{F}_t\}_{t \in \mathbb{D}_ε}$是$\mathbb{C}^2$上叶理$\mathcal{F}_0$的拓扑平凡（在$\mathbb{C}^2$中）解析变形.我们发现，在一些动力学的$\mathcal{F}_0$的限制下，我们有两种可能性：$\mathcal{F}_0$是达布（对数）叶状，或$\{\mathcal{F}_t\}_{t \in \mathbb{D}_ε}$是一个展开。我们以这种方式获得的分析分类之间的联系的展开和它的一个芽在奇点上的无穷线。证明了$\mathrm{Diff}(\mathbb{C}^n,0)$的多项式增长子群是可解的.
We give a complete topological classification of germs of holomorphic foliations in the plane under rather generic conditions. The key point is the introduction of a new topological invariant called monodromy representation. This monodromy contains all the relevant dynamical information, in particular the projective holonomy representation whose topological invariance was conjectured in the eighties by Cerveau and Sad and proved here under mild hypotheses.
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