... projective tensor 射影张量 projective theorem 射影定理 projective theory of curve 曲线射影理论 ...
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orthogonal projective theorem 正交投影定理
projective duality theorem [数] 射影对偶性定理
the projective plane theorem 射影平面定理
The author of the essay studies the transmutation of the triangular theorem of "Five Centers" theorem from the projective viewpoint and puts forward five thoughtful propositions through polarization.
本文用射影观点考察三角形的“五心”定理，通过配极变换推出五个新的命题。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
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