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This paper is concerned with a sufficient criterion to guarantee that a given foliation on a normal variety has algebraic and rationally connected leaves. Following ideas from a preprint of Bogomolov-McQuillan and using recent works of…

Algebraic Geometry · Mathematics 2009-09-29 Stefan Kebekus , Luis Sola Conde , Matei Toma

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

An introduction to geography of log models with applications to positive cones of FT varieties and to geometry of minimal models and Mori fibrations.

Algebraic Geometry · Mathematics 2010-05-18 Sung Rak Choi , Vyacheslav Shokurov

We prove the cone theorem for varieties with LCIQ singularities using deformation theory of stable maps into Deligne-Mumford stacks. We also obtain a sharper bound on $-(K_X+D)$-degree of $(K_X+D)$-negative extremal rays for projective…

Algebraic Geometry · Mathematics 2009-08-20 Jiun-Cheng Chen , Hsian-Hua Tseng

We construct partial category-valued field theories in (2+1)-dimensions using Lagrangian Floer theory in moduli spaces of central-curvature unitary connections with fixed determinant of rank r and degree d where r,d are coprime positive…

Symplectic Geometry · Mathematics 2018-06-27 Katrin Wehrheim , Chris Woodward

Any leafwise connection on a fibre bundle over a foliated manifold is proved to come from a connection on this fibre bundle.

Mathematical Physics · Physics 2007-05-23 G. Sardanashvily

Assuming the abundance conjecture in dimension $d$, we establish a non-algebraicity criterion of foliations: any log canonical foliation of rank $\le d$ with $\nu\neq\kappa$ is not algebraically integrable, answering question of…

Algebraic Geometry · Mathematics 2025-10-10 Jihao Liu , Zheng Xu

We interpret a formula for meromorphic functions on foliations by Riemann surfaces as an analogue to the product formula of valuations in algebraic number theory.

Number Theory · Mathematics 2007-05-23 Fabian Kopei

Using the theory of plugs and the self-insertion construction due to the second author, we prove that a foliation of any codimension of any manifold can be modified in a real analytic or piecewise-linear fashion so that all minimal sets…

Dynamical Systems · Mathematics 2007-05-23 Greg Kuperberg , Krystyna Kuperberg

We introduce geometric quantization for constant rank presymplectic structures with Riemannian null foliation and compact leaf closure space. We prove a quantization-commutes-with-reduction theorem in this context. Examples related to…

Symplectic Geometry · Mathematics 2022-09-29 Yi Lin , Yiannis Loizides , Reyer Sjamaar , Yanli Song

We describe several methods to construct minimal foliations by hyperbolic surfaces on closed 3-manifolds, and discuss the properties of the examples thus obtained.

Geometric Topology · Mathematics 2019-04-23 Fernando Alcalde Cuesta , Françoise Dal'Bo , Matilde Martínez , Alberto Verjovsky

The aim of this article is to introduce invariants of oriented, smooth, closed four-manifolds, built using the Floer homology theories defined in two earlier papers (math.SG/0101206 and math.SG/0105202). This four-dimensional theory also…

Symplectic Geometry · Mathematics 2007-05-23 Peter S Ozsvath , Zoltan Szabo

We study the stable pairs theory of local curves in 3-folds with descendent insertions. The rationality of the partition function of descendent invariants is established for the full local curve geometry (equivariant with respect to the…

Algebraic Geometry · Mathematics 2019-02-20 R. Pandharipande , A. Pixton

We give a new construction of the holonomy groupoid of a regular foliation in terms of a partial connection on a diffeological principal bundle of germs of transverse parametrisations. We extend these ideas to construct a novel holonomy…

Differential Geometry · Mathematics 2021-02-11 Lachlan Ewen MacDonald

In this work, we construct some irreducible components of the space of two-dimensional holomorphic foliations on $\mathbb{P}^n$ associated to some algebraic representations of the affine Lie algebra $\mathfrak{aff}(\mathbb{C})$. We give a…

Algebraic Geometry · Mathematics 2018-10-03 Raphael Constant da Costa

The main purpose of this paper is to give a simple and non-combinatorial proof of the toric Mori theory. Here, the toric Mori theory means the (log) Minimal Model Program (MMP, for short) for toric varieties. We minimize the arguments on…

Algebraic Geometry · Mathematics 2016-09-07 Osamu Fujino , Hiroshi Sato

This is a book on derived foliations, that are a generalisation of classical foliations in the context of derived geometry. The text starts with the basic definitions and constructions, then explore foliated cohomology (with crystal…

Algebraic Geometry · Mathematics 2025-07-31 Bertrand Toen , Gabriele Vezzosi

We review properties of closed meromorphic $1$-forms and of the foliations defined by them. We present and explain classical results from foliation theory, like index theorems, the existence of separatrices, and resolution of singularities…

Complex Variables · Mathematics 2023-06-07 Jorge Vitório Pereira

Layered monoidal theories provide a categorical framework for studying scientific theories at different levels of abstraction, via string diagrammatic algebra. We introduce models for three closely related classes of layered monoidal…

Category Theory · Mathematics 2026-02-27 Leo Lobski , Fabio Zanasi

We develop a gluing theory in the sense of Koll\'{a}r for slc surfaces and threefolds in positive characteristic. For surfaces we are able to deal with every positive characteristic $p$, while for threefolds we assume that $p>5$. Along the…

Algebraic Geometry · Mathematics 2022-10-06 Quentin Posva