Characterization of Banach spaces $Y$ satisfying that the pair $ (\ell_\infty^4,Y )$ has the Bishop-Phelps-Bollob\'as property for operators

TL;DR

This paper characterizes Banach spaces Y for which the pair (,Y) has the Bishop-Phelps-Bollobe1s property for operators, introducing a geometric property called AHSp- and identifying classes of spaces satisfying it.

Contribution

The paper introduces the AHSp- property and characterizes Banach spaces Y for which (,Y) has the Bishop-Phelps-Bollobe1s property, providing new insights into geometric properties of Banach spaces.

Findings

Spaces satisfying AHSp- include finite-dimensional, uniformly convex, C_0(L), and L_1() spaces.

AHSp- precisely characterizes when (,Y) has the Bishop-Phelps-Bollobe1s property.

The introduced geometric property links the structure of Y to operator approximation properties.

Abstract

We study the Bishop-Phelps-Bollob\'as property for operators from $\ell_\infty ^4 $ to a Banach space. For this reason we introduce an appropiate geometric property, namely the AHSp-$\ell_\infty ^4$. We prove that spaces $Y$satisfying AHSp-$\ell_\infty ^4$ are precisely those spaces $Y$ such that $(\ell_\infty^4,Y)$ has the Bishop-Phelps-Bollob\'as property. We also provide classes of Banach spaces satisfying this condition. For instance, finite-dimensional spaces, uniformly convex spaces, $C_0(L)$ and $L_1 (\mu)$ satisfy AHSp-$\ell_\infty ^4 $.