U. Hertrich-Jeromin, K. Mundilova, E. -H. Tjaden
We demonstrate that every non-tubular channel linear Weingarten surface in Euclidean space is a surface of revolution, hence parallel to a catenoid or a rotational surface of non-zero constant Gauss curvature. We provide explicit parametrizations and deduce existence of complete hyperbolic linear Weingarten surfaces.
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In this study, we investigated the (K,H), (K,K_{II}), (H,K_{II})-Weingarten and (K,H),(K,K_{II}),(H,K_{II}) and (K,H,K_{II})-linear Weingarten canal surfaces in IR^3.
Channel linear Weingarten surfaces in space forms
本文在 Lie 球面几何背景下统一研究了空间形式中的管道线性 Weingarten 曲面，证明了其等温性与旋转曲面性质，并给出了常 Gauss 曲率管道曲面及相关线性 Weingarten 曲面的显式参数化。
In \cite{WeiWu22-3} (J.Geom.Anal.32, 199(2022)), we classified HCMU surfaces in 3-dimensional Euclidean space as Weingarten surfaces by holomorphic functions. In this paper, using a totally different method from \cite{WeiWu22-3}, we will classify HCMU surfaces in 3-dimensional space forms as Weingarten surfaces. Moreover we will give a criteria of a Weingarten surface which is also an HCMU surface.
We prove that the natural principal parameters on a given Weingarten surface are also natural principal parameters for the parallel surfaces of the given one. As a consequence of this result we obtain that the natural PDE of any Weingarten surface is the natural PDE of its parallel surfaces. We show that the linear fractional Weingarten surfaces are exactly the surfaces satisfying a linear relation between their three curvatures. Our main result is classification of the natural PDE's of Weingarten surfaces with linear relation between their curvatures.
We prove that any uniformly elliptic Weingarten (topological) sphere in S2xR must be congruent to the canonical example associated to the Weingarten equation. The result is obtained by proving that rotational uniformly elliptic Weingarten surfaces in S2xR have bounded second fundamental form together with a Hopf type result by J. A. Gálvez and P. Mira.
On the Invariant Theory of Weingarten Surfaces in Euclidean Space
证明了欧几里得空间中任意强正则Weingarten曲面都带有局部几何主参数。基本定理指出，任何强正则Weingarten曲面是由它的结构函数和法曲率函数满足几何微分方程的运动。我们将这些结果应用于特殊的Weingarten曲面：极小曲面，常中曲率曲面和常Gauss曲率曲面。
In this paper, we study the timelike tubular Weingarten surfaces in 3-dimensional Minkowski space $IR_1^3 $.We have obtained some conditions for being $({K_{II},H})$, $({K_{II},K})$, timelike tubular Weingarten surfaces where are the second Gaussian curvature the Gaussian curvature and the mean curvature, respectively.
In this paper we review some author's results about Weingarten surfaces in Euclidean space $\r^3$ and hyperbolic space $\h^3$. We stress here in the search of examples of linear Weingarten surfaces that satisfy a certain geometric property. First, we consider Weingarten surfaces in $\r^3$ that are foliated by circles, proving that the surface is rotational, a Riemann example or a generalized cone. Next we classify rotational surfaces in $\r^3$ of hyperbolic type showing that there exist surfaces that are complete. Finally, we study linear Weingarten surfaces in $\h^3$ that are invariant by a g…
Height estimate for special weingarten surfaces of elliptic type in warped product
研究扭曲乘积空间中紧致椭圆型特殊 Weingarten 曲面的几何问题，核心贡献是建立垂直高度估计。
In this paper, we study meridian surfaces of Weingarten type in Euclidean 4-space E^4. We give the neccessary and sufficient conditions for a meridian surface in E^4 to become Weingarten type.
Discrete linear Weingarten surfaces in space forms are characterized as special discrete $Ω$-nets, a discrete analogue of Demoulin's $Ω$-surfaces. It is shown that the Lie-geometric deformation of $Ω$-nets descends to a Lawson transformation for discrete linear Weingarten surfaces, which coincides with the well-known Lawson correspondence in the constant mean curvature case.
In this paper, we study the rotational surfaces in the isotropic 3-space I^3. satisfying Weingarten conditions in terms of the relative curvature K (analogue of the Gaussian curvature) and the isotropic mean curvature H. In particular, we classify such surfaces of linear Weingarten type in I^3.
Polynomial Translation Weingarten Surfaces in 3-dimensional Euclidean space
本文将对E3中涉及多项式的平移曲面进行分类，这些曲面是Weingarten曲面。我们分析了满足2aH + bK = 0的Weingarten平移曲面。我们还研究了其他类型的翻译表面，涉及功率函数，其中第二高斯曲率消失。
Special Weingarten surfaces with planar convex boundary
本研究在特殊Weingarten曲面框架下证明了Ros-Rosenberg定理，得出在温和假设下三维欧氏空间中带平面凸边界的紧致连通嵌入特殊Weingarten曲面是拓扑圆盘的结论。
The techniques used in this paper are based on the exterior calculus of Maurer-Cartan forms, and Weingarten surfaces are used to illustrate the methods that apply to quadratic exterior equations with constant coefficients. Isothermic {\it surfaces of constant astigmatism} (non-linear Weingarten surfaces whose difference of principal curvatures is a constant) are shown to represent dual surfaces of isothermic surfaces which satisfy the relation $H + αK = 0$.
Special Weingarten surfaces foliated by circles
本文研究了欧氏空间中满足$a H+b K=c$型Weingarten条件的曲面，其中$a,b$和$c$是常数，$H$和$K$分别表示中曲率和Gauss曲率.证明了这样的曲面一定是旋转曲面、黎曼极小曲面或广义锥。
The aim of this paper is to present a complete description of all rotational linear Weingarten surface into the Euclidean sphere S3. These surfaces are characterized by a linear relation aH+bK=c, where H and K stand for their mean and Gaussian curvatures, respectively, whereas a; b and c are real constants.
Parabolic Weingarten surfaces in hyperbolic space
在双曲空间$\h^3$中，一个不被一组抛物等距所改变的曲面叫做抛物曲面。本文研究了$\h^3$的抛物曲面满足形式为$aκ_1+bκ_2=c$或$aH+bK=c$的线性Weingarten关系，其中$a,b,c\in \r$和通常的$κ_i$是主曲率，$H$是平均曲率，$K$是de高斯曲率.我们对双曲空间中的所有抛物线性Weingarten曲面进行了分类。
In this paper we define and analyze singularities of discrete linear Weingarten surfaces with Weierstrass-type representations in $3$-dimensional Riemannian and Lorentzian spaceforms. In particular, we discuss singularities of discrete surfaces with non-zero constant Gaussian curvature, and parallel surfaces of discrete minimal and maximal surfaces, and discrete constant mean curvature $1$ surfaces in de Sitter $3$-space, including comparisons with different previously known definitions of such singularities.
We study ruled surfaces in R3 which are obtained from dual spher- ical indicatrix curves of dual Frenet vector fields. We find the Gaussian and mean curvatures of the ruled surfaces and give some results of being Wein- garten surface.
In this work, we study spacelike surfaces in Minkowski space $E_1^3$ foliated by pieces of circles and that satisfy a linear Weingarten condition of type $a H+b K=c$, where $a,b$ and $c$ are constant and $H$ and $K$ denote the mean curvature and the Gauss curvature respectively. We show that such surfaces must be surfaces of revolution or surfaces with constant mean curvature H=0 or surfaces with constant Gauss curvature K=0.
In this short note, we show that the assumption "convex" in Theorem 7 of Brendle-Eichmair's paper \cite{BE} is unnecessary.
We prove several topological properties of linear Weingarten surfaces of Bryant type, as wave fronts in hyperbolic 3-space. For example, we show the orientability of such surfaces, and also co-orientability when they are not flat. Moreover, we show an explicit formula of the non-holomorphic hyperbolic Gauss map via another hyperbolic Gauss map which is holomorphic. Using this, we show the orientability and co-orientability of CMC-1 faces (i.e., constant mean curvature one surfaces with admissible singular points) in de Sitter 3-space. (CMC-1 faces might not be wave fronts in general, but belon…
In this article, we study spacelike and timelike rotational surfaces in a 3--dimensional de Sitter space $\mathbb{S}^3_1$ which are the orbit of a regular curve under the action of the orthogonal transformation of 4--dimensional Minkowski space $\mathbb{E}^4_1$ leaving a spacelike, a timelike or a degenerate plane pointwise fixed. We determine the profile curve of such Weingarten rotational surfaces parameterized by the principal curvature. Then, we classify spacelike and timelike Weingarten rotational surface in $\mathbb{S}^3_1$ with the principal curvatures $κ$ and $λ$ satisfying $κ=aλ+b$ or…
We establish what semi-discrete linear Weingarten surfaces with Weierstrass-type representations in $3$-dimensional Riemannian and Lorentzian spaceforms are, confirming their required properties regarding curvatures and parallel surfaces, and then classify them. We then define and analyze their singularities. In particular, we discuss singularities of (1) semi-discrete surfaces with non-zero constant Gaussian curvature, (2) parallel surfaces of semi-discrete minimal and maximal surfaces, and (3) semi-discrete constant mean curvature $1$ surfaces in de Sitter $3$-space. We include comparisons w…
In this paper we finish the classification of rotational special Weingarten surfaces in S^2 x R and H^2 x R; i.e. rotational surfaces in S^2 x R and H^2 x R whose mean curvature h and extrinsic curvature K_e satisfy h=f(h^2-K_e), for some function f in C^1([0,+infty)) such that 4x(f'(x))^2<1 for any x>=0.
Rotational Weingarten surfaces in Lorentz-Minkowski space
本文提出了一种基于几何线动量的研究方法，用于分类洛伦兹-闵可夫斯基空间中的旋转魏因加滕表面，并引入了非退化旋转二次曲面的表征。
On linear Weingarten surfaces
本文研究欧氏空间中满足线性Weingarten条件的曲面$κ_1=m κ_2 +n$，其中$m$和$n$是实数，$κ_1$和$κ_2$表示曲面上每一点的主曲率.我们调查可能存在的这样的表面参数化的单参数家庭的圆。除了旋转曲面之外，我们证明了除了$(m,n)=(-1,0)$的情况之外，不存在更多的旋转曲面，即如果曲面是Riemann发现的极小曲面的经典例子之一。
Properties and Transformations of Weingarten Surfaces
本文研究E3中旋转对称Weingarten曲面，分析脐点斜率限制、SL2(R)几何变换及Lagrangian变分表述，并证明半二次型曲面上作用的传递性与稳定性。
We give a relatively simple proof that a translation surface in Euclidean space that satisfies a relation of type $aH+bK=c$, for some real numbers $a,b,c$, where $H$ and $K$ are the mean curvature and the Gauss curvature of the surface, respectively, must have $a=0$ or $b=0$, and thus, $K$ is constant or $H$ is constant. Our method of proof extends to the Lorentzian ambient space.
In this article we fully classify regular tubular surfaces in Euclidean, Lorentzian and hyperbolic 3-spaces whose Gaussian and mean curvatures $K$ and $H$ verify a polynomial relation. More precisely, we determine the set $S(Q)$ of all regular tubular surfaces whose curvatures verify a given polynomial relation $Q(K,H)=0$, and the set $Q(S)$ of all polynomial relations vanished by the curvatures of a given tubular surface $S$.
We define discrete flat surfaces in hyperbolic 3-space from the perspective of discrete integrable systems and prove properties that justify the definition. We show how these surfaces correspond to previously defined discrete constant mean curvature 1 surfaces in hyperbolic 3-space, and we also describe discrete focal surfaces (discrete caustics) that can be used to define singularities on discrete flat surfaces. We also examine discrete linear Weingarten surfaces of Bryant type in hyperbolic 3-space, and consider an example of a discrete flat surface related to the Airy equation that exhibits…
Lie minimal Weingarten surfaces
本文研究黎曼空间形式中 Lie 球面不变能量的临界点 Lie 极小曲面，通过 Euler-Lagrange 方程刻画其主曲率，并证明常平均曲率曲面及平坦外围空间中满足仿射关系的曲面和椭圆线性 Weingarten 曲面均具有旋转性。
Weingarten transformations which, by definition, preserve the asymptotic lines on smooth surfaces have been studied extensively in classical differential geometry and also play an important role in connection with the modern geometric theory of integrable systems. Their natural discrete analogues have been investigated in great detail in the area of (integrable) discrete differential geometry and can be traced back at least to the early 1950s. Here, we propose a canonical analogue of (discrete) Weingarten transformations for hyperbolic nets, that is, C^1-surfaces which constitute hybrids of sm…
Given $a,b\in\mathbb{R}$ and $Φ\in C^1(\mathbb{S}^2)$, we study immersed oriented surfaces $Σ$ in the Euclidean 3-space $\mathbb{R}^3$ whose mean curvature $H$ and Gauss curvature $K$ satisfy $2aH+bK=Φ(N)$, where $N:Σ\rightarrow\mathbb{S}^2$ is the Gauss map. This theory widely generalize some of paramount importance such as the ones constant mean and Gauss curvature surfaces, linear Weingarten surfaces and self-translating solitons of the mean curvature flow. Under mild assumptions on the prescribed function $Φ$, we exhibit a classification result for rotational surfaces in the case that the …
Weingarten surfaces are those whose principal curvatures satisfy a functional relation, whose set of solutions is called the curvature diagram or the W-diagram of the surface. Making use of the notion of geometric linear momentum of a plane curve, we propose a new approach to the study of rotational Weingarten surfaces in Euclidean 3-space. Our contribution consists of reducing any type of Weingarten condition on a rotational surface to a first order differential equation on the momentum of the generatrix curve. In this line, we provide two new classification results involving a cubic and an h…
A characterization of Weingarten surfaces in hyperbolic 3-space
本文研究了三维双曲空间中定向测地线空间${\mathbb{L}}({\mathbb{H}}^3)$的二维子流形，它具有典型的中性Kähler结构.这样的曲面是拉格朗日曲面当且仅当在${\mathbb{H}}^3$中存在与$Σ$的测地线正交的曲面。证明了${\mathbb{L}}({\mathbb{H}}^3)$中Lagrange曲面上的诱导度规具有零Gauss曲率当且仅当${\mathbb{H}}^3$中的正交曲面是Weingarten：第二基本型的特征值是函数相关的.然后，我们在${\mathbb{L}}({\mathbb{H}}^3)$中的全零曲面进行分类，并恢复了${\mathbb{H}}^3$中的平坦和CMC 1曲面的全纯构造。
In this article, we study complete surfaces $Σ$, isometrically immersed in the product space $\mathbb{H}^2\times\mathbb{R}$ or $\mathbb{S}^2\times\mathbb{R}$ having positive extrinsic curvature $K_e$. Let $K_i$ denote the intrinsic curvature of $Σ$. Assume that the equation $aK_i+bK_e=c$ holds for some real constants $a\neq0$, $b>0$ and $c$. The main result of this article state that when such a surface is a topological sphere it is rotational.
Quadric surfaces of revolution in the 3-sphere as cubic Weingarten surfaces
本文研究了三维球面中旋转二次曲面的分类与特征，揭示其作为Weingarten曲面的几何普遍性。
Biconservative Weingarten surfaces with flat normal bundle in $N^4 (ε)$
本文研究四维空间形式中具有平坦法丛的非平行平均曲率向量场的双保守 Weingarten 曲面，给出相容性条件、存在性结果，并证明此类曲面非双调和。
In this paper, we show that an embedded Weingarten surface in S^3 of genus 1 must be rotationally symmetric, provided that certain structure conditions are satisfied. The argument involves an adaptation of our proof of Lawson's Conjecture for minimal tori.
Rotational linear Weingarten surfaces of hyperbolic type
欧几里得空间${\bf R}^3$中的线性Weingarten曲面是其中曲率$H$和高斯曲率$K$满足形式为$aH+bK=c$的关系的曲面，其中$a,b,c\in {\bf R}$。当$a^2+4bc<0$。本文对双曲型旋转线性Weingarten曲面进行了分类。因此，我们得到了一族完备的双曲线性Weingarten曲面在${\bf R}^3$，包括成周期性的表面与自相交。
Some structure theorems for Weingarten surfaces
研究边界为凸平面曲线的Weingarten曲面，给出曲面继承边界对称性的充分条件，并推广常平均曲率曲面的相关结果。
We study time-like surfaces in the three-dimensional Minkowski space with diagonalizable second fundamental form. On any time-like W-surface we introduce locally natural principal parameters and prove that such a surface is determined uniquely (up to motion) by a special invariant function, which satisfies a natural non-linear partial differential equation. This result can be interpreted as a solution of the Lund-Regge reduction problem for time-like W-surfaces with real principal curvatures in Minkowski space. We apply this theory to linear fractional time-like W-surfaces and obtain the natur…
Asymptotic behavior at infinity of Weingarten surfaces
研究了Weingarten曲面在无穷远处的渐进行为，推导了其渐进行为并解决了二维Dirichlet问题。
In this work we study surfaces in radial conformally flat spaces. We characterize surfaces of rotation with constant Gaussian and Extrinsic curvature in these radial 3-spaces. We prove that all the spheres in the conformal 3-space have constant Gaussian curvature $K=1$ if, and only if, the conformal factor is special. In this special case we study geometric properties of this ambient 3-space, and as an application we prove that it is isometric to the space ${\mathbb{S}}^2\times {\mathbb{R}}$, so we consider it as the {\em Radial Model} of ${\mathbb{S}}^2\times {\mathbb{R}}$. We obtain two clas…
On any space-like W-surface in the three-dimensional Minkowski space we introduce locally natural principal parameters and prove that such a surface is determined uniquely up to motion by a special invariant function, which satisfies a natural non-linear partial differential equation. This result can be interpreted as a solution to the Lund-Regge reduction problem for space-like W-surfaces in Minkowski space. We apply this theory to linear fractional space-like W-surfaces and obtain the natural non-linear partial differential equations describing them. We obtain a characterization of space-lik…
Elliptic Weingarten surfaces of minimal type in $\mathbb{R} \times_{h} \mathbb{R}$
本文在径向对称扭曲乘积 $\mathbb{R} \times_h \mathbb{R}$ 中研究满足 $H=f(H^2-K)$ 的极小类型椭圆 Weingarten 曲面，证明旋转不变例子的存在唯一性并分析生成曲线。
Umbilic slopes and cubic Weingarten surfaces
本文研究脐斜率并分类满足κ₂=cκ₁³的紧致浸入曲面，证明其每个连通分量均为旋转椭球，方法涉及齐次Hessian恒等式、唯一延拓及四阶增长估计。
We show that any star-shaped convex hypersurface with constant Weingarten curvature in the deSitter-Schwarzschild manifold is a sphere of symmetry. Moreover, we study an isoperimetric problem for bounded domains in the doubled Schwarzschild manifold. We prove the existence of an isoperimetric surface for any value of the enclosed volume, and we completely describe the isoperimetric surfaces for very large enclosed volume. This complements work in H. Bray's thesis, where isoperimetric surfaces homologous to the horizon are studied.
Elliptic special Weingarten surfaces of minimal type in $\mathbb{R}^3$ of finite total curvature
研究\(\mathbb{R}^3\)中有限全曲率的完备连通嵌入极小类型椭圆特殊Weingarten曲面，利用渐近理论推导公式，用Alexandrov反射方法证明定理，确定其旋转对称性，回答相关问题，指出特定条件下此类曲面仅为平面和特殊悬链面。
In the work \cite{Laredo} the author shows that every hypersurface in Euclidean space is locally associated to the unit sphere by a sphere congruence, whose radius function $R$ is a geometric invariant of hypersurface. In this paper we define for any surface $Σ$ its spherical mean curvature $H_S$ which depends on principal curvatures of $Σ$ and the radius function $R$. Then we consider two classes of surfaces: the ones with $H_S = 0$, called $H_1$-surfaces, and the surfaces with spherical mean curvature of harmonic type, named $H_2$-surfaces. We provide for each these classes a Weierstrass-typ…
We show by phase space analysis that there are exactly 17 possible qualitative behaviors for a rotational surface in $\mathbb{R}^3$ that satisfies an arbitrary elliptic Weingarten equation $W(κ_1,κ_2)=0$, and study the singularities of such examples. As global applications of this classification, we prove a sharp halfspace theorem for general elliptic Weingarten equations of finite order, and a classification of peaked elliptic Weingarten spheres with at most two singularities. In the case that $W$ is not elliptic, we give a negative answer to a question by Yau regarding the uniqueness of rota…
Rediscovered by a systematic search, a forgotten class of integrable surfaces is shown to disprove the Finkel-Wu conjecture. The associated integrable nonlinear partial differential equation $$ z_{yy} + (1/z)_{xx} + 2 = 0 $$ possesses a zero curvature representation, a third-order symmetry, and a nonlocal transformation to the sine-Gordon equation $ϕ_{ξη} = \sinϕ$. We leave open the problem of finding a Backlund autotransformation and a recursion operator that would produce a local hierarchy.
In this paper we classify Weingarten surfaces integrable in the sense of soliton theory. The criterion is that the associated Gauss equation possesses an sl(2)-valued zero curvature representation with a nonremovable parameter. Under certain restrictions on the jet order, the answer is given by a third order ordinary differential equation to govern the functional dependence of the principal curvatures. Employing the scaling and translation (offsetting) symmetry, we give a general solution of the governing equation in terms of elliptic integrals. We show that the instances when the elliptic int…
We prove that any complete, uniformly elliptic Weingarten surface in Euclidean $3$-space whose Gauss map image omits an open hemisphere is a cylinder or a plane. This generalizes a classical theorem by Hoffman, Osserman and Schoen for constant mean curvature surfaces. In particular, this proves that planes are the only complete, uniformly elliptic Weingarten multigraphs. We also show that this result holds for a large class of non-uniformly elliptic Weingarten equations. In particular, this solves in the affirmative the Bernstein problem for entire graphs for that class of elliptic equations. …
The isotropic 3-space \mathbb{I}^{3} is a real affine 3-space endowed with the metric dx^{2}+dy^{2}. In this paper we describe Weingarten and linear Weingarten affine translation surfaces in \mathbb{I}^{3}. Further we classify the affine translation surfaces in \mathbb{I}^{3} that satisfy certain equations in terms of the position vector and the Laplace operator.
The Codazzi Equation for Surfaces
本文发展了曲面上Codazzi方程的一个抽象理论，并用它作为分析工具，导出了空间型${\bb R}^3$，${\bb S}^3$和${\bb H}^3$中曲面的新的整体结果.我们给出了曲面论中主要依赖于Codazzi方程的一些经典定理的本质上尖锐的推广，并将它们应用于空间型中Weingarten曲面的研究。特别是，我们研究的存在性的全纯二次微分，唯一性的沉浸领域的几何问题，高度估计，以及完整的或适当嵌入的Weingarten表面的几何形状和唯一性。
In this study, we consider canal surfaces according to parallel transport frame in Euclidean space $\mathbb{E}^{4}$. The curvature properties of these surfaces are investigated with respect to $k_{1}$, $k_{2}$ and $k_{3}$ which are principal curvature functions according to parallel transport frame. We also give an example of canal surfaces in $\mathbb{E}^{4}.$ Further, we point out that if spine curve $γ$ is a straight line, then $M$ is a Weingarten canal surface and also $M$ is a linear Weingarten tube surface. Finally, the visualization of the projections of canal surfaces in $\mathbb{E}^{3…
Rotational cmc surfaces in terms of Jacobi elliptic functions
本文利用雅可比椭圆函数和Lie球面几何方法，对非欧空间形式中的旋转常平均曲率曲面进行分类，并给出双曲空间中旋转常调和平均曲率曲面的显式参数化，补全了管道线性Weingarten曲面分类的最后空白。
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