Enlargements of positive sets

Details Enlargements of positive sets Enlargements of positive sets

2008-11-26

arxiv.org/abs/0811.4341v1

Journal of Mathematical Analysis and Applications (2009), 356 (1), 328-337

Mathematics

Optimization and Control

16 pages

Scientific paper

10.1016/j.jmaa.2009.03.028

In this paper we introduce the notion of enlargement of a positive set in SSD spaces. To a maximally positive set $A$ we associate a family of enlargements $\E(A)$ and characterize the smallest and biggest element in this family with respect to the inclusion relation. We also emphasize the existence of a bijection between the subfamily of closed enlargements of $\E(A)$ and the family of so-called representative functions of $A$. We show that the extremal elements of the latter family are two functions recently introduced and studied by Stephen Simons. In this way we extend to SSD spaces some former results given for monotone and maximally monotone sets in Banach spaces.

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