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A problem of completing a linear map on C*-algebras to a completely positive map is analyzed. It is shown that whenever such a completion is feasible there exists a unique minimal completion. This theorem is used to show that under some…

算子代数 · 数学 2024-05-28 B. V. Rajarama Bhat , Arghya Chongdar

We discover a family of closed, embedded minimal surfaces in the three-dimensional round sphere which includes new examples with low genus. The existence proof relies on an equivariant min-max procedure applied to a novel sweepout which is…

微分几何 · 数学 2025-07-31 Mario B. Schulz , David Wiygul

Given a finite field k of characteristic at least 5, we show that the Tate conjecture holds for K3 surfaces defined over the algebraic closure of k if and only if there are only finitely many K3 surfaces over each finite extension of k.

代数几何 · 数学 2018-06-18 Max Lieblich , Davesh Maulik , Andrew Snowden

We describe some topological structure in the set of all surfaces with finitely many singularities in the 3-sphere. As an application, we prove that every Riemannian 3-sphere of positive Ricci curvature contains, for every g, a genus g…

微分几何 · 数学 2025-08-11 Adrian Chun-Pong Chu

We propose a discrete surface theory in $\mathbb R^3$ that unites the most prevalent versions of discrete special parametrizations. This theory encapsulates a large class of discrete surfaces given by a Lax representation and, in…

微分几何 · 数学 2014-12-24 Tim Hoffmann , Andrew O. Sageman-Furnas , Max Wardetzky

We give several applications of a lemma on completeness used by Osserman to show the meromorphicity of Weierstrass data for complete minimal surfaces with finite total curvature. Completeness and weak completeness are defined for several…

微分几何 · 数学 2014-02-26 Masaaki Umehara , Kotaro Yamada

We prove a descriptive theorem on the extrinsic geometry of an embedded minimal surface of injectivity radius zero in a homogeneously regular Riemannian three-manifold, in a certain small intrinsic neighborhood of a point of almost-minimal…

微分几何 · 数学 2016-10-18 William H. Meeks , Joaquin Perez , Antonio Ros

In this paper, we show that a complete embedded minimal surface in $\Real^3$ with finite topology and one end is conformal to a once-punctured compact Riemann surface. Moreover, using the conformality and embeddedness, we examine the…

微分几何 · 数学 2016-05-27 Jacob Bernstein , Christine Breiner

The existence of embedded minimal surfaces in non-compact 3-manifolds remains a largely unresolved and challenging problem in geometry. In this paper, we address several open cases regarding the existence of finite-area, embedded, complete,…

微分几何 · 数学 2025-06-17 Baris Coskunuzer , Zheng Huang , Ben Lowe , Franco Vargas Pallete

In this work we show two results about approximating, with respect to the compact-open topology, mapping classes on surfaces of infinite-type by quasi-conformal maps, in particular we are interested in density results. The first result is…

几何拓扑 · 数学 2024-08-02 Yassin Chandran , Tommaso Cremaschi

In this paper, we mainly study the compactness and local structure of immersing surfaces in $\mathbb{R}^n$ with local uniform bounded area and small total curvature $\int_{\Sigma\cap B_1(0)} |A|^2$. A key ingredient is a new quantity which…

微分几何 · 数学 2019-04-05 Jianxin Sun , Jie Zhou

This paper is the first in a series where we attempt to give a complete description of the space of all embedded minimal surfaces of fixed genus in a fixed (but arbitrary) closed Riemannian 3-manifold. The key for understanding such…

偏微分方程分析 · 数学 2007-05-23 Tobias H. Colding , William P. Minicozzi

We prove the existence of a one parameter family of minimal embedded hypersurfaces in $R^{n+1}$, for $n \geq 3$, which generalize the well known 2 dimensional "Riemann minimal surfaces". The hypersurfaces we obtain are complete, embedded,…

微分几何 · 数学 2007-05-23 S. Kaabachi , F. Pacard

A few facts concerning the phrase "the automorphism groups become larger at special points of the moduli of K3 surfaces" are presented. It is also shown that the automorphism groups are of infinite order over a dense subset in any…

代数几何 · 数学 2007-05-23 Keiji Oguiso

Surfaces of finite geometric type are complete, immersed into the tree-dimensional Euclidean space with finite total curvature and Gauss map extending to an oriented compact surface as a smooth branched covering map over the unit sphere of…

微分几何 · 数学 2019-06-24 Nícolas A. de Andrade , Luquesio P. Jorge

We prove the compactness of self-shrinkers in $\mathbb R^3$ with bounded entropy and fixed genus. As a corollary, we show that numbers of ends of such surfaces are uniformly bounded by the entropy and genus.

微分几何 · 数学 2019-12-02 Ao Sun , Zhichao Wang

McMullen proved that there exists an automorphism of minimal topological entropy on a projective K3 surface. We derive equations for the surface and its automorphism. We reconstruct the surface and its automorphism from the Hodge theoretic…

代数几何 · 数学 2022-09-27 Simon Brandhorst , Noam D. Elkies

For an immersed minimal surface in $\mathbb{R}^3$, we show that there exists a lower bound on its Morse index that depends on the genus and number of ends, counting multiplicity. This improves, in several ways, an estimate we previously…

微分几何 · 数学 2020-12-24 Otis Chodosh , Davi Maximo

We prove that a closed embedded minimal surface in the round three-sphere which satisfies the symmetries of a Lawson surface and has the same genus is congruent to the Lawson surface.

微分几何 · 数学 2022-06-14 Nikolaos Kapouleas , David Wiygul

We introduce a conjecture on homological mirror symmetry relating the symplectic topology of the complement of a smooth ample divisor in a K3 surface to algebraic geometry of type III degenerations, and prove it when the degree of the…

代数几何 · 数学 2021-11-15 Yanki Lekili , Kazushi Ueda