Tangent cones, starshape and convexity

J. M. Borwein

International Journal of Mathematics and Mathematical Sciences, 1978, vol. 1, 1-19

Abstract:

In the last few years various infinite dimensional extensions to Krasnoselski's Theorem on starshaped sets [14] have been made. These began with a paper by Edelstein and Keener [8] and have culminated in the papers by Borwein, Edelstein and O'Brien [3] [4] by Edelstein, Keener and O'Brien [9] and finally by O'Brien [16].

Unrelatedly, Borwein and O'Brien [5] posed a question which arises in optimization [2] [11] of when a closed set is pseudoconvex at all its members.

In this paper we show that these two questions can be handled simultaneously through a slight refinement of the powerful central result in [16] with attendant strengthening of the results in [5] [16]. This in turn leads to some interesting characterizations of convexity, starshape and of various functional conditions.

Date: 1978
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jijmms:629217

DOI: 10.1155/S0161171278000460

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