本文给出了关于二阶曲面的代数定义和射影定义之间的等价性定理。
This article is told the sense of equivalence between algebraic definition and projecting definition.
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。
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.
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。
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.
考虑了环境辐射影响，基于中值定理推导并定义等效波长，用于简化测温数学模型。
The equivalent wavelength is deduced and defined by considing the influence of ambient radiation, and adopted to simplify the mathematical model of temperature measurement.
考虑了环境辐射影响，基于中值定理推导并定义等效波长，用于简化测温数学模型。
The equivalent wavelength is deduced and defined by considing the influence of ambient radiation, and adopted to simplify the mathematical model of temperature measurement.
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