网站首页  英汉词典

请输入您要查询的英文单词:

 

单词 Gaussian curvature
释义

Gaussian curvature

中文百科

高斯曲率

由左至右:负高斯曲率曲面(双曲面),零高斯曲率曲面(圆柱面),和正高斯曲率曲面(球面)。
负曲率曲面上的三角形三角之和小于平面三角形的三角之和。
Tres superficies con curvatura gaussiana negativa (izquierda), cero (centro) y positiva (derecha).
Some points on the torus have positive, some have negative, and some have zero Gaussian curvature.

微分几何中,曲面上一点的高斯曲率是该点主曲率κ1κ2的乘积。它是曲率的内在度量,也即,它的值只依赖于曲面上的距离如何测量,而不是曲面如何嵌入到空间。这个结果是高斯绝妙定理的主要内容。

用符号表示,高斯曲率K定义为

 \Kappa = \kappa_1 \kappa_2 \,\!.

也可以如下给出

\Kappa = \frac{\langle (\nabla_2 \nabla_1 - \nabla_1 \nabla_2)\mathbf{e}_1, \mathbf{e}_2\rangle}{\det g},

其中\nabla_i = \nabla_{{\mathbf e}_i}是协变导数而g是度量张量。

R中的正规曲面的一点p,则高斯曲率为

K(\mathbf{p}) = \det(S(\mathbf{p})),

其中S为形算子。

关于高斯曲率的一个很有用的公式是用等温坐标中的拉普拉斯算子表达的刘维尔方程。

英语百科

Gaussian curvature 高斯曲率

From left to right: a surface of negative Gaussian curvature (hyperboloid), a surface of zero Gaussian curvature (cylinder), and a surface of positive Gaussian curvature (sphere).
Some points on the torus have positive, some have negative, and some have zero Gaussian curvature.
Saddle surface with normal planes in directions of principal curvatures
The sum of the angles of a triangle on a surface of negative curvature is less than that of a plane triangle.

In differential geometry, the Gaussian curvature or Gauss curvature Κ of a surface at a point is the product of the principal curvatures, κ1 and κ2, at the given point:

For example, a sphere of radius r has Gaussian curvature 1/r everywhere, and a flat plane and a cylinder have Gaussian curvature 0 everywhere. The Gaussian curvature can also be negative, as in the case of a hyperboloid or the inside of a torus.

随便看

 

英汉网英语在线翻译词典收录了3779314条英语词汇在线翻译词条,基本涵盖了全部常用英语词汇的中英文双语翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2024 encnc.com All Rights Reserved
更新时间:2025/6/19 11:06:53