Mathematics – Functional Analysis
Scientific paper
1997-06-12
Mathematics
Functional Analysis
Scientific paper
We present here a new method for approximating functions defined on superreflexive Banach spaces by differentiable functions with $\alpha$-H\"older derivatives (for some $0<\alpha\leq 1$). The smooth approximation is given by means of an explicit formula enjoying good properties from the minimization point of view. For instance, for any function $f$ which is bounded below and uniformly continuous on bounded sets this formula gives a sequence of $\Delta$-convex ${\Cal{C}}^{1,\alpha}$ functions converging uniformly on bounded sets to $f$ and preserving the infimum and the set of minimizers of $f$. The techniques we develop are based on the use of {\sl extended inf-convolution} formulas and convexity properties such as the preservation of smoothness for the convex envelope of certain differentiable functions.
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