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Sets of differentials and smoothness of convex functions. (English) Zbl 0839.46008
Summary: Approximation by smooth convex functions and questions on the smooth variational principle for a given convex function $$f$$ on a Banach space are studied in connection with majorising $$f$$ by $$C^1$$-smooth functions.
##### MSC:
 46B03 Isomorphic theory (including renorming) of Banach spaces 41A30 Approximation by other special function classes
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##### References:
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