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单词 null system
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null system
null system n. Mechanics and Geometry a system of null points and their corresponding null planes.
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1902 Amer. Math. Monthly 9 187 Finally the following three papers:..‘Null systems in space of five dimensions’, by Professor John Eisland, Theil College.
1911 Encycl. Brit. XVII. 967/1 In the ‘Null-System’ of A. F. Möbius (1790–1868), a line such that the moment of a given wrench about it is zero is called a null-line.
1964 C. E. Springer Geom. & Anal. Projective Spaces x. 273 In a polar correlation with a skew-symmetric matrix, every point is incident with its corresponding plane. This type of correlation is called a null system, a designation used in the theory of statics as developed by Möbius.
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