Contact properties of surfaces in R 3 with corank 1 singularities

Contact properties of surfaces in R 3 with corank 1 singularities
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R 3 中表面与 corank 1 奇点的接触特性

DOI:
10.2748/tmj/1429549581
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发表时间:
2015
影响因子:
0.5
通讯作者:
J. J. Nuño
J. J. Nuño
中科院分区:
数学4区
文献类型:
--
作者:
L. F. Martins;J. J. Nuño

文献摘要

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我们研究 R 3 中具有 corank 1 奇点的表面几何形状。在奇点处,我们使用曲面的第一和第二基本形式定义曲率抛物线,其中包含有关曲面的所有局部二阶几何信息。曲率抛物线用于引入渐近方向和脐曲率的概念,这些概念与表面与平面和球体的接触性质有关。
We study the geometry of surfaces in R 3 with corank 1 singularities. At a singular point we define the curvature parabola using the first and second fundamental forms of the surface, which contains all the local second order geometrical information about the surface. The curvature parabola is used to introduce the concepts of asymptotic directions and umbilic curvature, which are related to contact properties of the surface with planes and spheres.