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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:
:\|\mathbf A \|^2 = A_1^2 + A_2^2 +A_3^2 \
The magnitude also can be expressed using the dot product:
:\|\mathbf A \|^2 = (\mathbf ) \

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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