Definition:Continuity/Functional
< Definition:Continuity(Redirected from Definition:Continuous Functional)
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Definition
Let $y \in S$ be a mapping.
Let $J \sqbrk y: S \to \R$ be a functional.
Suppose:
- $\forall \epsilon \in \R_{>0}: \exists \delta \in \R_{>0}: \size {y - y_0} < \delta \implies \size {J \sqbrk y - J \sqbrk {y_0} } < \epsilon$
Then $J \sqbrk y$ is said to be a continuous functional and is continuous at the point $y_0 \in S$.
Sources
- 1963: I.M. Gelfand and S.V. Fomin: Calculus of Variations ... (previous) ... (next): $\S 1.2$: Function spaces