One counterexample concerning the Fréchet differentiability of convex functions on closed sets
Eva Matoušková (1993)
Acta Universitatis Carolinae. Mathematica et Physica
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Eva Matoušková (1993)
Acta Universitatis Carolinae. Mathematica et Physica
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Marianna Csörnyei, Assaf Naor (2003)
Studia Mathematica
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We give a geometric characterization of the convex subsets of a Banach space with the property that for any two convex continuous functions on this set, if their sum is Lipschitz, then the functions must be Lipschitz. We apply this result to the theory of Δ-convex functions.
Luděk Zajíček (1983)
Czechoslovak Mathematical Journal
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Luděk Zajíček (1997)
Acta Universitatis Carolinae. Mathematica et Physica
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