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Vector algebra relations : ウィキペディア英語版 | Vector algebra relations
The relations below apply to vectors in a three-dimensional Euclidean space.〔See, for example, 〕 Some, but not all of them, extend to vectors of higher dimensions. In particular, the cross product of two vectors is not available in all dimensions. See Seven-dimensional cross product. ==Magnitudes==
The magnitude of a vector A is determined by its three components along three orthogonal directions using Pythagoras' theorem: : The magnitude also can be expressed using the dot product: :
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