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math.FA2025
Old and New on Strongly Subadditive/Superadditive Functions
Constantin P. Niculescu
In this paper we provide insight into the classes of strongly subadditive/superadditive functions by highlighting numerous new examples and new results.
math.FA2024
Functional inequalities in the framework of Banach spaces
Constantin P. Niculescu
A quadrilateral inequality established by C. Schötz in the context of Hilbert spaces is extended to the framework of Banach spaces. Our approach is based on the majorization theory…