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Generalized Characterization of the Convex Envelope of a Function
Published online by Cambridge University Press: 15 July 2002
Abstract
We investigate the minima of functionals of the form $$\int_{[a,b]}g(\dot u(s)){\rm d}s$$ where g is strictly convex. The admissible functions $u:[a,b]\longrightarrow\mathbb{R}$ are not necessarily convex and satisfy $u\leq f$ on [a,b], u(a)=f(a), u(b)=f(b), f is a fixed function on [a,b]. We show that the minimum is attained by $\bar f$, the convex envelope of f.
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- © EDP Sciences, 2002