Double commutants of multiplication operators on $C(K).$

Abstract

Let $C(K)$ be the space of all real or complex valued continuous functions on a compact Hausdorff space $K$. We are interested in the following property of $K$: for any real valued $f\in C(K)$ the double commutant of the corresponding multiplication operator $F$ coincides with the norm closed algebra generated by $F$ and $I$. In this case we say that $K\in \mathcal{D}\mathcal{C}\mathcal{P}$. It was proved in \cite{Ki} that any locally connected metrizable continuum is in $\mathcal{D}\mathcal{C}\mathcal{P}$. In this paper we indicate a class of arc connected but not locally connected continua that are in $\mathcal{D}\mathcal{C}\mathcal{P}$. We also construct an example of a continuum that is not arc connected but is in $\mathcal{D}\mathcal{C}\mathcal{P}$.

8 pages