On uniformly convex functions
- Grelier, Guillaume
- Raja Baño, Matías 1
-
1
Universidad de Murcia
info
ISSN: 0022-247X
Année de publication: 2022
Volumen: 505
Número: 1
Pages: 125442
Type: Article
D'autres publications dans: Journal of Mathematical Analysis and Applications
Résumé
Non-convex functions that yet satisfy a condition of uniform convexity for non-closepoints can arise in discrete constructions. We prove that this sort of discrete uniformconvexity is inherited by the convex envelope, which is the key to obtain otherremarkable properties such as the coercivity. Our techniques allow to retrieve Enflo’suniformly convex renorming of super-reflexive Banach spaces as the regularizationof a raw function built from trees. Among other applications, we provide a sharpestimation of the distance of a given function to the set of differences of Lipschitzconvex functions. Finally, we prove the equivalence of several possible ways toquantify the super weakly noncompactness of a convex subset of a Banach space.
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