unit sphere

We obtain two formulas about the covariant derivative of the coordinate functions on the unit sphere in Eucdidean space.

得到了欧氏空间中，单位球面上坐标函数关于某一特定标架场的协变微分的两个等式。

Convex modulus depicted overall degree of convexity of the unit sphere of spaces. It was very different for degree of convexity of each point that it would produce very great influence on the whole feature of the spaces.

凸性模刻划了空间单位球面的总体凸性程度，但是每一点的凸性程度都有很大的不同，这将会对空间的整体性质产生很大影响。

Under the help of maths tools, the authors induct Poincare sphere and Stokes son space unit sphere to express the stations of polarization, and study their connection.

本文借助数学工具，引入Poincare球与Stokes子空间单位球表示光的偏振态，并对二者关系进行了研究。

An octahedral tessellation approximates a spherewith an octahedron whose vertices are all on the unIt'sphere.

八面体三角化把球面近似于一个顶点在单位球上的八面体.

Arc second ( arcsec ) is the unit of length in the celestial sphere.

角秒是天空长度的单位.