| Definition: | property of a three-dimensional Euclidean space, determined by the choice of a base forming a right-handed trihedron or a left-handed trihedron Note 1 to entry: A right-handed base is commonly chosen. If, exceptionally, a left-handed base is used for certain purposes, this shall be clearly stated to avoid the risk of sign errors. Note 2 to entry: For any n-dimensional vector space, the bases can be grouped in two classes according to the sign of the determinant of the base vectors relative to a given base chosen as reference for space orientation.
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