“null vector”的概念、定义、翻译、参考文献-科学参考

单词	null vector
释义	null vector [`nǝl `vek·tǝr] ^MATHEMATICS A vector whose invariant length, that is, the sum over the coordinates of the vector space of the product of its covariant component and contravariant component, is equal to zero. ^RELATIVITY In special relativity, a four vector whose spatial part in any Lorentz frame has a magnitude equal to the speed of light multiplied by its time part in that frame; a special case of the mathematics definition.
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