Definition: | for any vector U, non-negative scalar, usually denoted by |U|, equal to the non-negative square root of the scalar product or, in the case of a complex vector, of the Hermitian product of the vector by itself NOTE 1 The magnitude of a vector U has the following properties: - U=0 if and only if |U|=0,
- |αU|=|α|⋅|U| where α is a scalar,
- |U+V|≤|U|+|V| where V is any other vector.
NOTE 2 For a vector U in the three-dimensional Euclidean or Hermitian space with orthonormal base, the magnitude is given by |U|=√|U1|2+|U2|2+|U3|2. NOTE 3 The terms "Euclidean norm" and "Hermitian norm" may be used for the real or the complex case, respectively. NOTE 4 The magnitude of a vector U is represented by |U| or by U; is also used.
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