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Functional derivative

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Applied mathematics Control theory Variational analysis
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The concept of a functional derivative is a generalization of the ordinary derivative to functionals, which are mappings from a space of functions to the real numbers (or complex numbers). In essence, while a regular derivative gives the rate of change of a function with respect to its variables, a functional derivative captures the rate of change of a functional with respect to changes in the function it depends on.

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