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The most useful and interesting line bundles over algebraic curves of a very high genus have the ratio \delta of the degree to the genus close to half-integer values, usually \delta \approx 0, \delta \approx 1/2, or \delta \approx 1; the…

代数几何 · 数学 2007-05-23 Ilya Zakharevich

We study integral plane curves meeting at a single unibranch point and show that such curves must satisfy two equivalent conditions. A numeric condition: the local invariants of the curves at the contact point must be arithmetically…

代数几何 · 数学 2026-03-17 Lucia Caporaso , Amos Turchet

Non-degenerate real hypersurfaces of almost Hermite-like manifolds are examined. Tangential real hypersurfaces are introduced and the main identities of such hypersurfaces are obtained. With the help of these identities, contact metric…

微分几何 · 数学 2023-07-04 Esra Erkan , mehmet Gulbahar

The convenient setting for smooth mappings, holomorphic mappings, and real analytic mappings in infinite dimension is sketched. Infinite dimensional manifolds are discussed with special emphasis on smooth partitions of unity and tangent…

微分几何 · 数学 2016-09-06 Andreas Kriegl , Peter W. Michor

We characterize homogeneous hypersurfaces in complex space forms which arise as critical points of a higher order energy functional. As a consequence, we obtain existence and non-existence results for $\mathbb{CP}^n$ and $\mathbb{CH}^n$,…

微分几何 · 数学 2024-04-25 José Miguel Balado-Alves

In this note, we investigate the existence of smooth complete hypersurfaces in hyperbolic space with constant $(n-2)$-curvature and a prescribed asymptotic boundary at infinity. Previously, the existence was known only for a restricted…

微分几何 · 数学 2026-04-28 Bin Wang

In this paper, we show how to construct a special class of ruled hypersurfaces in the nonflat complex space forms $\mathbb{CP}^n$ and $\mathbb{C}H^n$. This is done by taking an arbitrary smooth curve in a totally geodesic (complex)…

微分几何 · 数学 2026-05-25 Thomas A. Ivey , Patrick J. Ryan

The Separatrix Theorem of C. Camacho and P. Sad guarantees the existence of invariant curve (separatrix) passing through the singularity of germ of holomorphic foliation on complex surface, when the surface underlying the foliation is…

动力系统 · 数学 2018-10-30 Edileno de Almeida Santos

We study projective curves and hypersurfaces defined over a finite field that are tangent to every member of a class of low-degree varieties. Extending 2-dimensional work of Asgarli, we first explore the lowest degrees attainable by smooth…

代数几何 · 数学 2024-09-10 Charlie Bruggemann , Vera Choi , Brian Freidin , Jaedon Whyte

The author has been interested in regions surrounded by cylinders of real algebraic hypersurfaces and their shapes and polynomials associated to them. Here, we formulate and investigate natural decompositions into such cylinders of real…

代数几何 · 数学 2026-01-13 Naoki Kitazawa

We define and study analogs of curve graphs for infinite type surfaces. Our definitions use the geometry of a fixed surface and vertices of our graphs are infinite multicurves which are bounded in both a geometric and a topological sense.…

几何拓扑 · 数学 2014-10-14 Ariadna Fossas , Hugo Parlier

This article deals with the existence of hypersurfaces minimizing general shape functionals under certain geometric constraints. We consider as admissible shapes orientable hypersurfaces satisfying a so-called reach condition, also known as…

偏微分方程分析 · 数学 2022-06-10 Yannick Privat , Rémi Robin , Mario Sigalotti

Given an ample real Hermitian holomorphic line bundle $L$ over a real algebraic variety $X$, the space of real holomorphic sections of $L^{\otimes d}$ inherits a natural Gaussian probability measure. We prove that the probability that the…

代数几何 · 数学 2020-09-28 Michele Ancona

We prove the existence of normal forms for some local real-analytic Levi-flat hypersurfaces with an isolated line singularity. We also give sufficient conditions for that a Levi-flat hypersurface with a complex line as singularity to be a…

复变函数 · 数学 2015-06-15 Arturo Fernández-Pérez

We prove a result which establishes restrictions on the pseudoholomorphic curves which can exist in a stable Hamiltonian manifold in the presence of certain $\mathbb{R}$-invariant foliations of the symplectization by holomorphic…

辛几何 · 数学 2019-02-08 Agustin Moreno , Richard Siefring

We extend the infinitesimal Torelli theorem for smooth hypersurfaces to nodal hypersurfaces.

代数几何 · 数学 2019-08-15 Zhenjian Wang

This paper studies hypersurface exceptional singularities in $\mathbb C^n$ defined by non-degenerate function. For each canonical hypersurface singularity, there exists a weighted homogeneous singularity such that the former is exceptional…

代数几何 · 数学 2007-05-23 Shihoko Ishii , Yuri Prokhorov

The aim of this paper is to give some characterizations for N-Legendre and N-slant curves in the unit tangent bundles of surfaces endowed with natural diagonal lifted structures.

微分几何 · 数学 2022-04-08 Murat Altunbaş

In this article, we consider a real smooth hypersurface $M\subset \mathbb C^2$, which is of infinite type at $p\in M$. The purpose of this paper is to show that the real vector space of tangential holomorphic vector field germs at $p$…

复变函数 · 数学 2014-04-23 Ninh Van Thu , Chu Van Tiep , Mai Anh Duc

The purpose of this paper is to give explicit descriptions for stability groups of real rigid hypersurfaces of infinite type in $\mathbb C^2$. The decompositions of infinitesimal CR automorphisms are also given.

复变函数 · 数学 2016-06-08 Atsushi Hayashimoto , Ninh Van Thu