Definition:Maximum Value of Functional
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Definition
Let $y, \hat y \in S: \R \to \R$ be real functions.
Let $J \sqbrk y: S \to \R $ be a functional.
Let $J$ have a (relative) extremum for $y = \hat y$.
Suppose, $J \sqbrk y - J \sqbrk {\hat y} \le 0$ in the neighbourhood of $y = \hat y$.
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Then this extremum is called the maximum of the functional $J$.
Sources
- 1963: I.M. Gelfand and S.V. Fomin: Calculus of Variations ... (previous) ... (next): $\S 1.3$: The Variation of a Functional. A Necessary Condition for an Extremum
