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We construct nontrivial homomorphisms from the quasi group of some cubic surfaces over $\bbF_{\!p}$ into a group. We show experimentally that the homomorphisms constructed are the only possible ones and that there are no nontrivial…

代数几何 · 数学 2011-02-08 Andreas-Stephan Elsenhans , Jörg Jahnel

We define discrete constant mean curvature (cmc) surfaces in the three-dimensional Euclidean and Lorentz spaces in terms of sphere packings with orthogonally intersecting circles. These discrete cmc surfaces can be constructed from…

微分几何 · 数学 2024-10-14 Alexander I. Bobenko , Tim Hoffmann , Nina Smeenk

We determine all helix surfaces with parallel mean curvature vector field, which are not minimal or pseudo-umbilical, in spaces of type $M^n(c)\times\mathbb{R}$, where $M^n(c)$ is a simply-connected $n$-dimensional manifold with constant…

微分几何 · 数学 2015-06-18 Dorel Fetcu

We consider constant mean curvature surfaces of finite topology, properly embedded in three-space in the sense of Alexandrov. Such surfaces with three ends and genus zero were constructed and completely classified by the authors in…

微分几何 · 数学 2007-12-05 Karsten Grosse-Brauckmann , Robert B. Kusner , John M. Sullivan

We give an infinite dimensional generalized Weierstrass representation for spacelike constant mean curvature (CMC) surfaces in Minkowski 3-space $\real^{2,1}$. The formulation is analogous to that given by Dorfmeister, Pedit and Wu for CMC…

微分几何 · 数学 2009-11-28 David Brander , Wayne Rossman , Nick Schmitt

The Hessian of a general cubic surface is a nodal quartic surface, hence its desingularisation is a K3 surface. We determine the transcendental lattice of the Hessian K3 surface for various cubic surfaces (with nodes and/or Eckardt points…

代数几何 · 数学 2007-05-23 Elisa Dardanelli , Bert van Geemen

We survey our recent results on classifying complete constant mean curvature 1 (CMC-1) surfaces in hyperbolic 3-space with low total curvature. There are two natural notions of "total curvature"-- one is the total absolute curvature which…

微分几何 · 数学 2009-08-03 Wayne Rossman , Masaaki Umehara , Kotaro Yamada

We explain how the current knowledge on the set of complete noncompact constant mean curvature surfaces can be exploited to produce new examples of compact constant mean curvature surfaces of genus greater than or equal to 3.

微分几何 · 数学 2007-05-23 M. Jleli , F. Pacard

We investigate CMC-surfaces with periodic metric in a dressing orbit of the cylinder. It is shown, that such surfaces are always of finite type. Using the periodicity conditions for the extended frame of a CMC-surface, we develop an…

dg-ga · 数学 2008-02-03 Josef Dorfmeister , Guido Haak

We find all analytic surfaces in space $\mathbb{R}^3$ such that through each point of the surface one can draw two transversal circular arcs fully contained in the surface. The problem of finding such surfaces traces back to the works of…

微分几何 · 数学 2022-05-03 Mikhail Skopenkov , Rimvydas Krasauskas

We proved the existence of rational curves in every linear system on a general K3 surface and that all rational curves in the hyperplane class are nodal on a general K3 surface of small genus.

代数几何 · 数学 2007-05-23 Xi Chen

We prove a Simons type equation for non-minimal surfaces with parallel mean curvature vector (pmc surfaces) in $M^n(c)\times\mathbb{R}$, where $M^n(c)$ is an $n$-dimensional space form. Then, we use this equation in order to characterize…

微分几何 · 数学 2011-02-03 Dorel Fetcu , Harold Rosenberg

Liebmann's Theorem asserts that a compact, connected, convex surface with constant mean curvature (CMC) in the Euclidean space must be a totally umbilical sphere. In this article we extend Liebmann's result to hypersurfaces with boundary.…

微分几何 · 数学 2025-08-26 Flávio França Cruz , Barbara Nelli

Comessatti proved that the set of real points of a rational real algebraic surface is either a nonorientable surface, or the two-sphere, or the torus. Conversely, it is easy to see that all of these surfaces admit a rational real algebraic…

代数几何 · 数学 2007-07-17 Indranil Biswas , Johannes Huisman

In this paper, we study biconservative surfaces with parallel normalized mean curvature vector field ($PNMC$) in the $4$-dimensional unit Euclidean sphere $\mathbb{S}^4$. First, we study the existence and uniqueness of such surfaces. We…

微分几何 · 数学 2022-11-16 Simona Nistor , Cezar Oniciuc , Nurettin Cenk Turgay , Rüya Yeğin Şen

We show that each end of a noncompact self-shrinker in $\mathbb{R}^3$ of finite topology is smoothly asymptotic to either a regular cone or a self-shrinking round cylinder.

微分几何 · 数学 2016-10-18 Lu Wang

The theory of complete surfaces of (nonzero) constant mean curvature in $\RR^3$ has progressed markedly in the last decade. This paper surveys a number of these developments in the setting of Alexandrov embedded surfaces; the focus is on…

微分几何 · 数学 2007-05-23 Rafe Mazzeo

We confirm a well-known conjecture that the round sphere is the only compact, embedded self-similar shrinking solution to the mean curvature flow with genus $0$. More generally, we show that the only properly embedded self-similar shrinkers…

微分几何 · 数学 2015-10-27 S. Brendle

We study rotational surfaces with constant Minkowski Gaussian curvature and rotational surfaces with constant Minkowski mean curvature in a $3$-dimensional normed space with rotationally symmetric norm. We have a generalization of the…

微分几何 · 数学 2021-12-03 Makoto Sakaki

In this paper we study constant angle surfaces in Euclidean 3-space. Even that the result is a consequence of some classical results involving the Gauss map (of the surface), we give another approach to classify all surfaces for which the…

微分几何 · 数学 2009-07-01 Marian Ioan Munteanu , Ana Irina Nistor