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Various Lipschitz-like Properties for Functions and Sets I: Directional Derivative and Tangential Characterizations
Author(s) -
Rafaël Correa,
Pedro Gajardo,
Lionel Thibault
Publication year - 2010
Publication title -
siam journal on optimization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.066
H-Index - 136
eISSN - 1095-7189
pISSN - 1052-6234
DOI - 10.1137/080738271
Subject(s) - mathematics , lipschitz continuity , banach space , tangent cone , directional derivative , bounded function , tangent , pure mathematics , regular polygon , zero (linguistics) , space (punctuation) , mathematical analysis , discrete mathematics , geometry , linguistics , philosophy
In this work we introduce for extended real valued functions, defined on a Banach space X, the concept of K directionally Lipschitzian behavior, where K is a bounded subset of X. For different types of sets K (e.g., zero, singleton, or compact), the K directionally Lipschitzian behavior recovers well-known concepts in variational analysis (locally Lipschitzian, directionally Lipschitzian, or compactly epi-Lipschitzian properties, respectively). Characterizations of this notion are provided in terms of the lower Dini subderivatives. We also adapt the concept for sets and establish characterizations of the mentioned behavior in terms of the Bouligand tangent cones. The special case of convex functions and sets is also studied.This research was partially supported by FONDECYT project 1080173 and Programa Basal CMM U. de Chile

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