The approximate hyperplane series property and ... - Project Euclid
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The approximate hyperplane series property and ... - Project Euclid
THE APPROXIMATE HYPERPLANE SERIES PROPERTY AND RELATED PROPERTIES MAR´IA D. ACOSTA,1 RICHARD MARTIN ARON,2 and FRANCISCO JAVIER GARC´IA-PACHECO3* In beloved memory of Professor Antonio Aizpuru Communicated by D. E. Alspach Abstract. We show that the approximate hyperplane series property (AHSp) is stable under finite `p -sums (1 ≤ p < ∞). As a consequence, we obtain that the class of spaces Y such that the pair (`1 , Y ) has the Bishop–Phelps–Bollob´as property for operators is stable under finite `p -sums for 1 ≤ p < ∞. We also deduce that every Banach space of dimension at least 2 can be equivalently renormed to have the AHSp but to fail Lindenstrauss’ property β. We also show that every infinite-dimensional Banach space admitting an equivalent strictly convex norm also admits such an equivalent norm failing the AHSp.
1. Introduction Our main objectives here are to examine the stability properties of the approximate hyperplane series property (AHSp) and the behavior of this property under equivalent renormings. This section is devoted to basic definitions and a review of known results related to the AHSp and to the Bishop–Phelps–Bollob´as property. All Banach spaces throughout this manuscript will be considered real or complex since all the results and definitions work for both cases. For a Banach space X, as usual, BX and SX denote the closed unit ball and the unit sphere of X, respectively. We will write X ∗ for the topological dual of X. By a convex series we mean a series of nonnegative real numbers whose sum is Copyright 2017 by the Tusi Mathematical Research Group. Received Mar. 15, 2016; Accepted May 12, 2016. * Corresponding author. 2010 Mathematics Subject Classification. Primary 46B20; Secondary 46B03. Keywords. Bishop–Phelps–Bollob´ as property, property β, equivalent renorming. 295
