All stereographic projections of the point groups were drawn.
绘出了各点群的极赤投影图;列出了各点群的所有群元和生成元;填写出了最大的固有点群10 22的群乘表。
in this paper, the stereographic projection for circle on spherical surface is discussed.
讨论了球面上圆的极赤投影问题，从而为球面机构问题的研究提供了一种可行的几何途径。
This paper provides a solution which will assist the theoretic research and applied development for stereographic projection.
极赤投影具有特殊的投影性质，所以它在多种学科中得到应用。
According to the feature of drawing crystal shape from gnomonic projection,a data structure (the single 3 table chain structure )is presented.
根据极平投影绘晶体形态的特点，建立了一种数据结构———单链三表结构，此结构由面表、线表、点表组成，能充分反映晶体形态的拓扑信息和几何信息，并在此基础上设计了一种适合于变换和消隐处理的数据结
Goldschmidt s gnomonic projection,a method of comparison with line and face about the identified visibility of the crystal face on gnomonic plane is given to search hidden line of mineral crystal shape.
根据图形消隐的基本原理，针对心射极平投影的特点，使用线、面比较法在极平投影面上判断晶面的可见性，进而消除矿物晶体形态图中的隐藏线。
In this paper the auther puts forward the stereographic projection in which the projection plane is the equatorial plane of projection-sphere, recommends the rules about perspective mapping of plane field in projective geometry and reveals two corollaries in stereographic projection.
本文提出了以投影圆球之赤道平面为投影平面的一种球极投影，首次引入了射影几何理论中关于平面场透视变换的双旋法则，并得到了两个关于球极投影的推论。
By means of stereographic projection, the paper presents thenon-degenerate parametrically rational polynomial representation of sphere.
利用球极投影导出了球面片的非退化ＮＵＲＢＳ表示。
Under the stereographic projection, the initial data on the sphere are projected to a plane.
基于球极投影保持PH性质这一特性,通过球极投影把球面数据投影到平面上,构造一条平面PH曲线。
And the relationship between formal solutions and projective limit of Ehresmann chain is shown based on stratification theory.
以分层理论为基础,给出了偏微分方程组形式解的存在性定理以及形式解与Ehresmann链的投影极限的关系·