On the Dini-Hadamard subdifferential of the difference of two functions

Details On the Dini-Hadamard subdifferential of the difference of two functions On the Dini-Hadamard subdifferential of the difference of two functions

2010-04-19

arxiv.org/abs/1004.3136v1

Mathematics

Optimization and Control

19 pages

Scientific paper

In this paper we first provide a general formula of inclusion for the Dini-Hadamard epsilon-subdifferential of the difference of two functions and show that it becomes equality in case the functions are directionally approximately starshaped at a given point and a weak topological assumption is fulfilled. To this end we give a useful characterization of the Dini-Hadamard epsilon-subdifferential by means of sponges. The achieved results are employed in the formulation of optimality conditions via the Dini-Hadamard subdifferential for cone-constrained optimization problems having the difference of two functions as objective.

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