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Origin (mathematics)
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Origin (mathematics) : ウィキペディア英語版
Origin (mathematics)

In mathematics, the origin of a Euclidean space is a special point, usually denoted by the letter ''O'', used as a fixed point of reference for the geometry of the surrounding space.
==Cartesian coordinates==
In a Cartesian coordinate system, the origin is the point where the axes of the system intersect.〔.〕 The origin divides each of these axes into two halves, a positive and a negative semiaxis.〔.〕 Points can then be located with reference to the origin by giving their numerical coordinates—that is, the positions of their projections along each axis, either in the positive or negative direction. The coordinates of the origin are always all zero, for example (0,0) in two dimensions and (0,0,0) in three.〔

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