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・ Four-spiral semigroup
・ Four-spotted barb
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Four-tensor
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・ Four-vector
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・ Four-vertex theorem
・ Four-wave mixing


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Four-tensor : ウィキペディア英語版
Four-tensor
Four-tensor is a frequent abbreviation for a tensor in a four-dimensional spacetime.〔Lambourne, Robert J A. Relativity, Gravitation and Cosmology. Cambridge University Press. 2010.〕
==Syntax==
General four-tensors are usually written as A^_, with the indices taking integral values from 0 to 3. Such a tensor is said to have contravariant rank n and covariant rank m.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Four-tensor」の詳細全文を読む



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