Remote Access Proceedings of the American Mathematical Society
Green Open Access

Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)

 

 

Isometries of spaces of weak $ *$ continuous functions


Authors: Michael Cambern and Krzysztof Jarosz
Journal: Proc. Amer. Math. Soc. 106 (1989), 707-712
MSC: Primary 46E40; Secondary 46B20
DOI: https://doi.org/10.1090/S0002-9939-1989-0968623-4
MathSciNet review: 968623
Full-text PDF Free Access

Abstract | References | Similar Articles | Additional Information

Abstract: If $ X$ is a compact Hausdorff space and $ {E^*}$ a Banach dual, we denote by $ C(X,({E^*},{\sigma ^*}))$ the Banach space of continuous functions from $ X$ to $ {E^*}$ when the latter space is given its weak * topology. It is shown that if $ E_1^*,E_2^*$ have trivial centralizers and satisfy a topological condition introduced by Namioka and Phelps, then, given an isometry $ T$ mapping $ C(X_1^*,({E_1},{\sigma ^*}))$ onto $ C({X_2},(E_2^*,{\sigma ^*}))$ and given $ F \in C({X_1},(E_1^*,{\sigma ^*}))$, there exists a dense $ {G_\delta }$ in $ {X_2}$ on which

$\displaystyle (*)\quad (TF)(x) = U(x)F \circ \Phi (x),$

where $ \Phi $ is a homeomorphism of $ {X_2}$ onto $ {X_1}$ and $ U( \cdot )$ an operator-valued function independent of $ F$. If the $ E_i^*$ are separable then the $ U(x)$ are surjective isometries and $ x \to U(x)$ is continuous. When the $ {X_i}$ are metric the representation (*) holds on all of $ {X_2}$.

References [Enhancements On Off] (What's this?)


Similar Articles

Retrieve articles in Proceedings of the American Mathematical Society with MSC: 46E40, 46B20

Retrieve articles in all journals with MSC: 46E40, 46B20


Additional Information

DOI: https://doi.org/10.1090/S0002-9939-1989-0968623-4
Article copyright: © Copyright 1989 American Mathematical Society