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单词 Oriented surface
释义

Oriented surface

中文百科

定向 (矢量空间) Orientation (vector space)

(重定向自Oriented surface)

数学中,实矢量空间的一个定向Orientation)是对哪些有序基是“正”定向以及哪些是“负”定向的一个选取。在三维欧几里得空间中,两个可能的基本定向分别称为右手系与左手系。但是定向的选取与基的手征性是独立的(尽管右手基典型地选为正定向,但它们也可规定为负定向)。

英语百科

Orientation (vector space) 定向 (向量空间)

(重定向自Oriented surface)
The left-handed orientation is shown on the left, and the right-handed on the right.
Parallel plane segments with the same attitude, magnitude and orientation, all corresponding to the same bivector a ∧ b.[3]
The orientation of a volume may be determined by the orientation on its boundary, indicated by the circulating arrows.

In mathematics, orientation is a geometric notion that in two dimensions allows one to say when a cycle goes around clockwise or counterclockwise, and in three dimensions when a figure is left-handed or right-handed. In linear algebra, the notion of orientation makes sense in arbitrary finite dimension. In this setting, the orientation of an ordered basis is a kind of asymmetry that makes a reflection impossible to replicate by means of a simple rotation. Thus, in three dimensions, it is impossible to make the left hand of a human figure into the right hand of the figure by applying a rotation alone, but it is possible to do so by reflecting the figure in a mirror. As a result, in the three-dimensional Euclidean space, the two possible basis orientations are called right-handed and left-handed (or right-chiral and left-chiral).

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