Derivations in algebras of operator-valued functions

Abstract

In this paper we study derivations in subalgebras of $L_0^{wo}(\nu ;$, the algebra of all weak operator measurable funtions $f:S\to \mathcal{L}(X)$, where is the Banach algebra of all bounded linear operators on a Banach space $X$. It is shown, in particular, that all derivations on $L_0^{wo}(\nu ;\mathcal{L}(X))$ are inner whenever $X$ is separable and infinite dimensional. This contrasts strongly with the fact that $L_0^{wo}(\nu ;\mathcal{L}(X))$ admits non-trivial non-inner derivations whenever $X$ is finite dimensional and the measure $\nu$ is non-atomic. As an application of our approach, we study derivations in various algebras of measurable operators affiliated with von Neumann algebras.

48 pages