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How to transform one convex function continuously into another
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DOI：10.1137/060664513.png)
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Abstract
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The proximal average operator provides a parametric family of convex functions that continuously transform one convex function into another even when the domains of the two functions do not intersect. We prove that the proximal average operator is a homotopy with respect to the epi-topology, study its properties, and present several explicit formulas for specific classes of functions. The parametric family inherits desirable properties such as differentiability and strict convexity from the given functions. The results illustrate the powerful tools available in convex and variational analysis from both a theoretical and a computational point of view.
Keywords:
Attouch-Wets topology
continuous transformation
convex function
deformation
epi-convergence
epi-topology
Fenchel conjugate
homotopy
proximal average
proximal mapping
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