... 射影线元(素) projective line element 射影向量 projective vector 射影星形线 projective astroid ...
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It is shown that the 2_dimensional projective coordinate system can be constructed by homogeneous vector on the basis of the Descartes homogeneous coordinates.
在笛氏齐次坐标的基础上,采用齐次向量的方法,建立二维射影坐标系。
Two different surface straight lines distance not essential discovers male hangs the line segment, only must solve using the vector projective property then.
两条异面直线的距离也不必要找出公垂线段,只需利用向量的射影性质来解即可。
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