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Big weak open radius versus big slice diameter

Ginés López-Pérez, Esteban Martínez Vañó, Abraham Rueda Zoca

Abstract

We show that there exists a Banach space in which every non-empty weakly open subset of its unit ball has radius one, the maximum possible value, but the infimum of the diameter of its slices is exactly one, so extremely far from its maximum. In fact, we show that there is a wide class of non-isomorphic Banach spaces satisfying this extreme difference between the behaviour of the radius and the diameter of non-empty weakly open subsets.

Big weak open radius versus big slice diameter

Abstract

We show that there exists a Banach space in which every non-empty weakly open subset of its unit ball has radius one, the maximum possible value, but the infimum of the diameter of its slices is exactly one, so extremely far from its maximum. In fact, we show that there is a wide class of non-isomorphic Banach spaces satisfying this extreme difference between the behaviour of the radius and the diameter of non-empty weakly open subsets.
Paper Structure (3 sections, 6 theorems, 76 equations)

This paper contains 3 sections, 6 theorems, 76 equations.

Table of Contents

  1. Introduction
  2. r-big weak open property. Stability properties
  3. Proof of Theorem \ref{['maintheorem']}

Key Result

Theorem 1.1

There exists a Banach space $X$ with the r-BWOP and such that

Theorems & Definitions (16)

  • Theorem 1.1
  • Definition 2.1
  • Lemma 2.2
  • Definition 2.3
  • Remark 2.4
  • Remark 2.5
  • Proposition 2.6
  • proof
  • Proposition 2.7
  • proof
  • ...and 6 more