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- W4308919616 abstract "Given a set H of functions defined on a set X, á function f:X↦R¯ is called abstract H-convex if it is the upper envelope of its H-minorants, i.e. such its minorants which belong to the set H; and f is called regularly abstract H-convex if it is the upper envelope of its maximal (with respect to the pointwise ordering) H-minorants. In the paper we first present the basic notions of (regular) H-convexity for the case when H is an abstract set of functions. For this abstract case a general sufficient condition based on Zorn's lemma for a H-convex function to be regularly H-convex is formulated. The goal of the paper is to study the particular class of regularly H-convex functions, when H is the set LCˆ(X,R) of real-valued Lipschitz continuous classically concave functions defined on a real normed space X. For an extended-real-valued function f:X↦R¯ to be LCˆ-convex it is necessary and sufficient that f be lower semicontinuous and bounded from below by a Lipschitz continuous function; moreover, each LCˆ-convex function is regularly LCˆ-convex as well. We focus on LCˆ-subdifferentiability of functions at a given point. We prove that the set of points at which an LCˆ-convex function is LCˆ-subdifferentiable is dense in its effective domain. This result extends the well-known classical Brøndsted-Rockafellar theorem on the existence of the subdifferential for convex lower semicontinuous functions to the more wide class of lower semicontinuous functions. Using the subset LCˆθ of the set LCˆ consisting of such Lipschitz continuous concave functions that vanish at the origin we introduce the notions of LCˆθ-subgradient and LCˆθ-subdifferential of a function at a point which generalize the corresponding notions of the classical convex analysis. Some properties and simple calculus rules for LCˆθ-subdifferentials as well as LCˆθ-subdifferential conditions for global extremum points are established. Symmetric notions of abstract LCˇ-concavity and LCˇ-superdifferentiability of functions where LCˇ:=LCˇ(X,R) is the set of Lipschitz continuous convex functions are also considered." @default.
- W4308919616 created "2022-11-19" @default.
- W4308919616 creator A5056059552 @default.
- W4308919616 date "2022-11-11" @default.
- W4308919616 modified "2023-09-27" @default.
- W4308919616 title "Regularly abstract convex functions with respect to the set of Lipschitz continuous concave functions" @default.
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- W4308919616 doi "https://doi.org/10.1080/02331934.2022.2145173" @default.
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