Stability Results of Diameter Two Properties
Journal of convex analysis, Tome 22 (2015) no. 1, pp. 1-17
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A Banach space has the diameter two property if every (nonempty) weakly open set of its unit ball has diameter two. We prove that this property is stable under finite sums, whenever an absolute norm is considered in the product space, improving some previous results. Recently T. A. Abrahamsen, V. Lima and O. Nygaard [J. Convex Analysis 20 (2013) 329--338] defined the so-called strong diameter two property, i.e. every convex combination of slices in the unit ball has diameter two.
Classification : 46B20, 46B22
Mots-clés : Banach space, weakly open set, slice, absolute norm, diameter two property, Radon-Nikodym property
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     title = {Stability {Results} of {Diameter} {Two} {Properties}},
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M. D. Acosta; J. Becerra-Guerrero; G. López-Pérez. Stability Results of Diameter Two Properties. Journal of convex analysis, Tome 22 (2015) no. 1, pp. 1-17. http://geodesic.mathdoc.fr/item/JCA_2015_22_1_JCA_2015_22_1_a0/