Diameter preserving linear bijections of $C(X)$

Details Diameter preserving linear bijections of $C(X)$ Diameter preserving linear bijections of $C(X)$

1997-07-04

arxiv.org/abs/math/9707208v1

Mathematics

Functional Analysis

Scientific paper

The aim of this paper is to solve a linear preserver problem on the function algebra $C(X)$. We show that in case $X$ is a first countable compact Hausdorff space, every linear bijection $\phi:C(X)\to C(X)$ having the property that $diam(\phi(f)(X))=diam(f(X))$ $(f\in C(X))$ is of the form \[ \phi(f)=\tau \cdot f\circ \varphi +t(f)1 \qquad (f\in C(X)) \] where $\tau$ is a complex number of modulus 1, $\varphi:X\to X$ is a homeomorphism and $t$ is a linear functional on $C(X)$.

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