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The wigner property for CL-spaces and finite-dimensional polyhedral Banach spaces

Published online by Cambridge University Press:  30 April 2021

Dongni Tan
Affiliation:
School of Computer Science and Engineering, Tianjin University of Technology, Tianjin300384, P.R. China ([email protected])
Xujian Huang
Affiliation:
Department of Mathematics, Tianjin University of Technology, Tianjin300384, P.R. China ([email protected])

Abstract

We say that a map $f$ from a Banach space $X$ to another Banach space $Y$ is a phase-isometry if the equality

\[ \{\|f(x)+f(y)\|, \|f(x)-f(y)\|\}=\{\|x+y\|, \|x-y\|\} \]
holds for all $x,\,y\in X$. A Banach space $X$ is said to have the Wigner property if for any Banach space $Y$ and every surjective phase-isometry $f : X\rightarrow Y$, there exists a phase function $\varepsilon : X \rightarrow \{-1,\,1\}$ such that $\varepsilon \cdot f$ is a linear isometry. We present some basic properties of phase-isometries between two real Banach spaces. These enable us to show that all finite-dimensional polyhedral Banach spaces and CL-spaces possess the Wigner property.

Type
Research Article
Copyright
Copyright © The Author(s) 2021. Published by Cambridge University Press on Behalf of The Edinburgh Mathematical Society

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