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We proof here the existence of a topological thick and thin decomposition of any closed definable thick isolated singularity germ in the spirit of the recently discovered metric thick and thin decomposition of complex normal surface…

Metric Geometry · Mathematics 2012-08-22 Lev Birbrair , Alexandre Fernandes , Vincent Grandjean

A contact foliation is a foliation endowed with a leafwise contact structure. In this remark we explain a turbulisation procedure that allows us to prove that tightness is not a homotopy invariant property for contact foliations.

Symplectic Geometry · Mathematics 2017-09-13 Álvaro del Pino

We study the topological properties of the leaves of the singular foliation induced by a closed 1-form of Morse type on a compact orbifold. In particular, we establish criteria that characterize when all such leaves are compact, when they…

Differential Geometry · Mathematics 2026-04-06 Daniel Lopez Garcia , Fabricio Valencia

We consider singular holomorphic foliations on compact complex surfaces with invariant rational nodal curve of positive self-intersection. Then, under some assumptions, we list all possible foliations.

Dynamical Systems · Mathematics 2016-06-27 Edileno de Almeida Santos

In this notes we classify toric Fano 4-folds having positive second Chern Character.

Algebraic Geometry · Mathematics 2011-09-06 Edilaine Ervilha Nobili

In this paper, we investigate tropical secant varieties of ordinary linear spaces. These correspond to the log-limit sets of ordinary toric varieties; we show that their interesting parts are combinatorially isomorphic to a certain natural…

Combinatorics · Mathematics 2007-05-23 Mike Develin

We establish a criterion that ensures a bounded almost complex curve in a bounded almost complex 4-manifold minimizes genus amongst all smooth surfaces that share its homology class and the transverse link on its boundary. An immediate…

Geometric Topology · Mathematics 2025-12-04 Matthew Hedden , Katherine Raoux

We study analytic deformations and unfoldings of holomorphic foliations in complex projective plane $\mathbb{C}P(2)$. Let $\{\mathcal{F}_t\}_{t \in \mathbb{D}_{\epsilon}}$ be topological trivial (in $\mathbb{C}^2$) analytic deformation of a…

Dynamical Systems · Mathematics 2007-09-17 Mahdi Teymuri Garakani

We completely classify the Q-factorial terminal toric Fano three-folds such that the sum of the squared torus invariant prime divisors is non-negative.

Algebraic Geometry · Mathematics 2023-02-22 Hiroshi Sato , Ryota Sumiyoshi

This paper is devoted to the study of various aspects of deformations of log pairs, especially in connection to questions related to the invariance of singularities and log plurigenera. In particular, using recent results from the minimal…

Algebraic Geometry · Mathematics 2009-06-24 Tommaso de Fernex , Christopher D. Hacon

We classify singular foliations admitting a given leaf and a given transverse singular foliation.

Differential Geometry · Mathematics 2026-01-21 Simon-Raphael Fischer , Camille Laurent-Gengoux

This paper is a contribution to the study of foliations on $\mathbb{CP}^2$ with a unique singularity. We provide an explicit example in degree 7 of such a foliation, in the non dicritical case, having a divergent separatrix, and…

Dynamical Systems · Mathematics 2024-11-06 Claudia R. Alcántara , Jorge Mozo-Fernández

Let $\omega$ be a differential $q$-form defining a foliation of codimension $q$ in a projective variety. In this article we study the singular locus of $\omega$ in various settings. We relate a certain type of singularities, which we name…

Algebraic Geometry · Mathematics 2021-06-16 Cesar Massri , Ariel Molinuevo , Federico Quallbrunn

This paper is devoted to the study of codimension two holomorphic foliations and distributions. We prove the stability of complete intersection of codimension two distributions and foliations in the local case. Converserly we show the…

Dynamical Systems · Mathematics 2016-06-01 Dominique Cerveau , Alcides Lins Neto

We study the characteristic foliation of a twisted Jacobi manifold. We show that a twisted Jacobi manifold is foliated into leaves that are, according to the parity of the dimension, endowed with a twisted contact or a twisted locally…

Differential Geometry · Mathematics 2007-05-23 J. M. Nunes da Costa , F. Petalidou

For any non-simple (1,1)-knot in $S^3$ or a lens space, we construct a co-oriented taut foliation in its complement that intersects the boundary torus transversely in a suspension foliation of the knot meridian, or the infinity slope. This…

Geometric Topology · Mathematics 2025-08-13 Qingfeng Lyu

We prove that the anti-canonical divisors of weak Fano 3-folds with log canonical singularities are semiample. Moreover, we consider semiampleness of the anti-log canonical divisor of any weak log Fano pair with log canonical singularities.…

Algebraic Geometry · Mathematics 2010-05-10 Yoshinori Gongyo

We classify the polarized symplectic automorphisms of Fano varieties of smooth cubic fourfolds (equipped with the Pl\"ucker polarization) and study the fixed loci.

Algebraic Geometry · Mathematics 2013-03-15 Lie Fu

We study conformal structure and topology of leaves of singular foliations by Riemann surfaces.

Complex Variables · Mathematics 2016-12-02 Nessim Sibony , Erlend Fornæss Wold

We show that the topological equivalence class of holomorphic foliation germs with an isolated singularity of Poincar\'e type is determined by the topological equivalence class of the real intersection foliation of the (suitably normalized)…

Complex Variables · Mathematics 2017-07-20 Thomas Eckl , Michael Lönne
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