If there is a holomorphic surjective map from X onto Y,there exist curves in X biholomorphic to the complex projective line.
如果存在n维复流形X到n维代数流形的非同构的全纯满射(n≥2),那么X中存在与复射影直线全纯同构的曲线。
In order to meet the need of the study of the graphics theory,this paper explores the feasibity of setting up the graphic system of projective transformation,and puts forward the overall plan available for the whole system.
为了适应图学理论研究的需要，对建立射影变换绘图系统进行了探讨，并提出了整个系统的总体设想。
This paper makes a comparison between Euclidean classification,affine classification and projective classification about quadratic curue.
本文通过对二次曲线的欧氏分类，仿射分类和射影分类三种方法的比较，探讨了这三种方法之间的联系和区
The instantaneous curvature center in relative motion of contact point of the link mechanism is gained distinctly and directly by applying the concept of projective geometry.
本文运用射影几何的概念，明显、直观地给出了拨杆机构接触点相对运动轨迹瞬时曲率中心的几何位置，并举例说明了其应用。
he projective relatioi1ship of axonometric stereo projection is analysed,andthe projective nature of the points,ines and plaiies in axonometric stereo p…ection is discussed.
分析了轴测体视投影的射影关系，论述了轴测体在投影中直线、平面的射影性质。
By using the Lagrange s method of multip liers about the extreme value problem, the projection of a point of a k_dimensional plane and the distance from a point to a k_dimensional plane is deduced.
利用求条件极值的拉格朗日乘数法给出了欧氏空间Rn 中点在k维平面上的一个射影公式和点到k维平面的一个距离公式 ,由此推出了通常的点到平面和点到空间直线的距离公式 ,并推出了一个新的点到空间直线的距离公式。
By means of geometric model of projectire line and projactire plane,and from point of view on transformation,this paper extended the geometric model of three dimensional projective space.
本文从变换的角度，借助射影直线，射影平面的几何模型，推导出三维射影空间的几何模
This paper stuelies the impontant effect upon iceal elements,complec elements and dual elements im projective geometry when Euclidean geometry developsintQ Projectiue feometry,And from this two kinds of specil proving method and comstruction are reduce
本文论述了射影几何中理想元素、复元素和对偶元素的引入对几何学从欧氏几何发展到射影几何的重要作用，分析了由此导出的两种特殊的证明方法和作图方
(1) The Box-Jenkins recursive forecasting method advanced by Box and Jenkins, (2) Projection forecasting metho.
目前，对时间序列分析的方法主要有以下三种：(1)由Box和Jenkins提出的Box-Jenkins递推预报方法；(2)由Brockwell和Dayis以Hilbert空间的基本理论和方法为基础提出的射影预报方法；(3)最优滤波理论。