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Journal of Mathematical Analysis and Applications
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Reconstruction of the Clarke Subdifferential by the Lasry–Lions Regularizations

Reconstruction of the Clarke subdifferential by the Lasry-Lions regularizations
Authors: Georgiev, Pando Gr.; Zlateva, Nadia P.;

Reconstruction of the Clarke Subdifferential by the Lasry–Lions Regularizations

Abstract

Suppose that \(f\) is a locally Lipschitz function defined on a Hilbert space, which satisfies the growth condition \[ -{C\over 2}(\|x\|^2+ 1)\leq f(x)\leq {C\over 2}(\|x\|^2+ 1). \] It is proved that the Clarke subdifferential \(\partial f(x)\) (of \(f\) at \(x\)) can be represented by the derivatives of its Lasry-Lions regularizations \((f_\lambda)^\mu\) as \(\partial f(x)=\overline{\text{co }}A(x)\), where \(A(x)= \limsup\{((f_\lambda)^\mu)'(z)\); \(\lambda\to 0\), \(\mu/\lambda\to 0\), \(z\to x\}\) [see \textit{J.-M. Lasry} and \textit{P.-L. Lions}, Isr. J. Math. 55, 257-266 (1986; Zbl 0631.49018)]. For Lipschitz functions \(f: E\to\mathbb{R}\) defined on arbitrary Banach spaces, it is proved that \(\partial f(x)= w^*\)-closure (\(\text{conv }L(f,x)\)), where \(L(f,x)\) is a set also defined in terms of Lasry-Lions regularization functions. This fact completes a result due to \textit{J. Benoist} [C. R. Acad. Sci., Paris, Sér. I 315, 941-944 (1992; Zbl 0772.49009)], who was the first to notice the inclusion \(\subset\).

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Keywords

Derivatives of functions in infinite-dimensional spaces, Applied Mathematics, Nonsmooth analysis, Lasry-Lions regularizations, Clarke subdifferential, Analysis, Continuous and differentiable maps in nonlinear functional analysis

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
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