- element of a vector space
- directed line segment in a point space
NOTE 1 An n-dimensional vector is represented by an ordered set of n scalars, usually real or complex numbers, which depend on the choice of the base. In matrix notation, these scalars are usually represented as a column matrix: NOTE 2 A vector in a Euclidean space is characterized by its magnitude (102-03-23) and, if it is a non-zero vector, by its direction (102-03-12). NOTE 3 A complex vector U is defined by a real part and an imaginary part: where A and B are real vectors. NOTE 4 A vector is indicated by a letter symbol in sloped boldface type or by an arrow above a sloped lightface letter symbol: U or . The vector U with components can be denoted . NOTE 5 The term "vector" is also used for a vector quantity (102-03-21).
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