Noncompactness and noncompleteness in isometries of Lipschitz spaces

Details Noncompactness and noncompleteness in isometries of Lipschitz spaces Noncompactness and noncompleteness in isometries of Lipschitz spaces

2010-06-15

arxiv.org/abs/1006.2995v2

Mathematics

Functional Analysis

25 pages, no figures, \documentclass[12pt]{amsart} Changes with respect to the first version include the description of isomet

Scientific paper

We solve the following three questions concerning surjective linear isometries between spaces of Lipschitz functions $\mathrm{Lip}(X,E)$ and $\mathrm{Lip}(Y,F)$, for strictly convex normed spaces $E$ and $F$ and metric spaces $X$ and $Y$: \begin{enumerate} \item Characterize those base spaces $X$ and $Y$ for which all isometries are weighted composition maps. \item Give a condition independent of base spaces under which all isometries are weighted composition maps. \item Provide the general form of an isometry, both when it is a weighted composition map and when it is not. \end{enumerate} In particular, we prove that requirements of completeness on $X$ and $Y$ are not necessary when $E$ and $F$ are not complete, which is in sharp contrast with results known in the scalar context.

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