The paper is devoted to a comprehensive second-order study of a remarkable class of convex extended-real-valuedfunctions that is highly important in many aspects of nonlinear and variational analysis, specifically th...
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The paper is devoted to a comprehensive second-order study of a remarkable class of convex extended-real-valuedfunctions that is highly important in many aspects of nonlinear and variational analysis, specifically those related to optimization and stability. This class consists of lower semicontinuous functions with possibly infinite values on finite-dimensional spaces, which are labeled as "piecewiselinear" ones and can be equivalently described via the convexity of their epigraphs. In this paper we calculate the second-order subdifferentials (generalized Hessians) of arbitrary convex piecewiselinearfunctions, together with the corresponding geometric objects, entirely in terms of their initial data. The obtained formulas allow us, in particular, to justify a new exact (equality-type) second-order sum rule for such functions in the general nonsmooth setting. (C) 2015 Elsevier Ltd. All rights reserved.
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