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We prove that any metric surface (that is, metric space homeomorphic to a 2-manifold with boundary) with locally finite Hausdorff 2-measure is the Gromov-Hausdorff limit of polyhedral surfaces with controlled geometry. We use this result,…

Metric Geometry · Mathematics 2022-06-03 Dimitrios Ntalampekos , Matthew Romney

We first prove that given a hyperbolic metric $h$ on a closed surface $S$, any flat metric on $S$ with negative singular curvatures isometrically embeds as a convex polyhedral Cauchy surface in a unique future-complete flat globally…

Metric Geometry · Mathematics 2025-02-04 François Fillastre , Roman Prosanov

After the surface theory of M\"obius geometry, this study concerns a pair of conformally immersed surfaces in $n$-sphere. Two new invariants $\theta$ and $\rho$ associated with them are introduced as well as the notion of touch and…

Differential Geometry · Mathematics 2007-05-23 Xiang Ma

In this note we provide a direct proof of the complete classification of conformally flat isoparametric submanifolds of Euclidean space.

Differential Geometry · Mathematics 2019-05-03 Christos-Raent Onti

We establish a connection between two previously unrelated topics: a particular discrete version of conformal geometry for triangulated surfaces, and the geometry of ideal polyhedra in hyperbolic three-space. Two triangulated surfaces are…

Geometric Topology · Mathematics 2015-09-02 Alexander Bobenko , Ulrich Pinkall , Boris Springborn

In Part I, we develop the notions of a Moebius structure and a conformal Cartan geometry, establish an equivalence between them; we use them in Part II to study submanifolds of conformal manifolds in arbitrary dimension and codimension. We…

Differential Geometry · Mathematics 2010-06-30 Francis E. Burstall , David M. J. Calderbank

We study hyperbolic polyhedral surfaces with faces isometric to regular hyperbolic polygons satisfying that the total angles at vertices are at least $2\pi.$ The combinatorial information of these surfaces is shown to be identified with…

Metric Geometry · Mathematics 2022-10-10 Yohji Akama , Bobo Hua

We classify hypersurfaces of rank two of Euclidean space $\R^{n+1}$ that admit genuine isometric deformations in $\R^{n+2}$. That an isometric immersion $\hat f\colon\,M^n\to\R^{n+2}$ is a genuine isometric deformation of a hypersurface…

Differential Geometry · Mathematics 2011-06-22 Luis Florit , Marcos Dajczer , Ruy Tojeiro

We establish that equally-spaced smectic configurations enjoy an infinite-dimensional conformal symmetry and show that there is a natural map between them and null hypersurfaces in maximally-symmetric spacetimes. By choosing the appropriate…

Soft Condensed Matter · Physics 2012-05-14 Gareth P. Alexander , Randall D. Kamien , Ricardo A. Mosna

We investigate a supersymmetric generalisation of topological recursion from two perspectives: algebraic and geometric. The algebraic side concerns a recursive structure encoded in modules of a super Virasoro algebra, and the geometric…

Mathematical Physics · Physics 2025-11-24 Nezhla Aghaei , Reinier Kramer , Nicolas Orantin , Kento Osuga

We prove that a deformation of a hypersurface in a $(n+1)$-dimensional real space form ${\mathbb S}^{n+1}_{p,1}$ induce a Hamiltonian variation of the normal congruence in the space ${\mathbb L}({\mathbb S}^{n+1}_{p,1})$ of oriented…

Differential Geometry · Mathematics 2017-11-30 Nikos Georgiou , Guillermo Antonio Lobos Villagra

The purpose of this work is to close the local deformation problem of rank two Euclidean submanifolds in codimension two by describing their moduli space of deformations. In the process, we provide an explicit simple representation of these…

Differential Geometry · Mathematics 2016-03-17 Luis A. Florit , Guilherme M. de Freitas

We establish two classification theorems for Willmore surfaces in $\mathbb{S}^2 \times \mathbb{S}^2$. Firstly, we prove that a Willmore surface which is also minimal must be either a special complex curve given by a slice or a diagonal; or,…

Differential Geometry · Mathematics 2026-02-06 Xiaoling Chai , Shimpei Kobayashi , Changping Wang , Zhenxiao Xie

We study ends of an oriented, immersed, non-compact, complete Willmore surfaces, which are critical points of the integral of the square of the mean curvature, in asymptotically flat spaces of any dimension; assuming the surface has…

Differential Geometry · Mathematics 2016-03-29 Yann Bernard , Tristan Riviere

We found a class of triangulated surfaces in Euclidean space which have similar properties as isothermic surfaces in Differential Geometry. We call a surface isothermic if it admits an infinitesimal isometric deformation preserving the mean…

Differential Geometry · Mathematics 2016-02-16 Wai Yeung Lam , Ulrich Pinkall

Let $(M^n,g)$ be simply connected, complete, with non-positive sectional curvatures, and $\Sigma$ a 2-dimensional closed integral current (or flat chain mod 2) with compact support in $M$. Let $S$ be an area minimising integral 3-current…

Differential Geometry · Mathematics 2020-02-05 Felix Schulze

We prove that the Gauss curvature and the curvature of the normal connection of any minimal surface in the four dimensional Euclidean space satisfy an inequality, which generates two classes of minimal surfaces: minimal surfaces of general…

Differential Geometry · Mathematics 2008-06-23 Georgi Ganchev , Velichka Milousheva

We find the first examples of real hypersurfaces with two nonconstant principal curvatures in complex projective and hyperbolic planes, and we classify them. It turns out that each such hypersurface is foliated by equidistant Lagrangian…

Differential Geometry · Mathematics 2013-10-02 J. Carlos Diaz-Ramos , Miguel Dominguez-Vazquez , Cristina Vidal-Castiñeira

In this paper we introduce the notion of cofrontal mappings, as the dual objects to frontal mappings, and study their basic local and global properties. Cofrontals are very special mappings and far from generic nor stable except for the…

Differential Geometry · Mathematics 2018-11-06 Goo Ishikawa

Let $(M,g)$ be an $n$-dimensional asymptotically flat Riemannian manifold with nonnegative scalar curvature that admits a noncompact area-minimizing hypersurface $\Sigma \subset M$. In the case where $n = 3$, O. Chodosh and the first-named…

Differential Geometry · Mathematics 2025-06-12 Michael Eichmair , Thomas Koerber