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ON THE EXTENSION OF ISOMETRIES BETWEEN THE UNIT SPHERES OF A $\text{JBW}^{\ast }$-TRIPLE AND A BANACH SPACE

Published online by Cambridge University Press:  15 April 2019

Julio Becerra-Guerrero
Affiliation:
Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Granada, 18071Granada, Spain (juliobg@ugr.es; mcueto@ugr.es; pacopolo@ugr.es; aperalta@ugr.es)
María Cueto-Avellaneda
Affiliation:
Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Granada, 18071Granada, Spain (juliobg@ugr.es; mcueto@ugr.es; pacopolo@ugr.es; aperalta@ugr.es)
Francisco J. Fernández-Polo
Affiliation:
Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Granada, 18071Granada, Spain (juliobg@ugr.es; mcueto@ugr.es; pacopolo@ugr.es; aperalta@ugr.es)
Antonio M. Peralta
Affiliation:
Departamento de Análisis Matemático, Facultad de Ciencias, Universidad de Granada, 18071Granada, Spain (juliobg@ugr.es; mcueto@ugr.es; pacopolo@ugr.es; aperalta@ugr.es)

Abstract

We prove that if $M$ is a $\text{JBW}^{\ast }$-triple and not a Cartan factor of rank two, then $M$ satisfies the Mazur–Ulam property, that is, every surjective isometry from the unit sphere of $M$ onto the unit sphere of another real Banach space $Y$ extends to a surjective real linear isometry from $M$ onto $Y$.

Type
Research Article
Copyright
© Cambridge University Press 2019

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