单词	perspectivity
释义	perspectivity Given two lines L and L' in a projective plane (see projective space) and a point O on neither line, each point P on L can be be associated with a point P' on L' such that O,P,P' are collinear (as in the figure). The bijection from L to L' sending P to P' is known as a perspectivity, or the perspectivity from O. By assigning homogeneous coordinates to L and L', the lines can be identified, and so we can consider perspectivities from a line to itself. The perspectivities of a line generate the projective transformations of the line. See Desargues' theorem. A perspectivity between two lines
随便看	Hermitian conjugate Hero (Heron) of Alexandria Hero's formula Hero's method hertz Hessian heteroscedastic heuristic hexadecimal representation hexagon hexagram hexahedron hexa‐ higher arithmetic higher derivative higher‐order partial derivative highest common factor Hilbert, David Hilbert's basis theorem Hilbert space Hilbert's paradox Hilbert's programme Hilbert's tenth problem Hindu-Arabic number system histogram

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