... projective duality theorem 射影对偶性定理 projective figure 射影图形 projective general linear group 一般射影线性群 ...
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交比和无穷远元素是射影几何中的两个重要概念,它们是探讨图形射影性质的主要工具。
Cross ratio and element at infinity are two important concepts with projective geometry and primary tools in considerate projective property of figures.
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