| Definition: | function for which both the argument and the value are functions NOTE 1 An example of transformation is the Fourier transformation, where the argument is a function of time and the value is the Fourier transform of this function. When the argument, the value, or both, are ordered set of entities, a linear transformation is often represented by a matrix. NOTE 2 For historical reasons, some transformations are called operators, e.g. nabla operator (IEC 60050-102, 102-05-18).
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