English

Derivations on ideals in commutative $AW^*$-algebras

Operator Algebras 2012-08-27 v3

Abstract

Let A\mathcal{A} be a commutative AWAW^*-algebra, let S(A)S(\mathcal{A}) be the *-algebra of all measurable operators affiliated with A\mathcal{A}, let I\mathcal{I} be an ideal in A\mathcal{A}, let s(I)s(\mathcal{I}) be the support of the ideal I\mathcal{I} and let Y\mathbb{Y} be a solid subspace in S(A)S(\mathcal{A}). The necessary and sufficient conditions of existence of non-zero band preserving derivations from I\mathcal{I} to Y\mathbb{Y} are given. We show that, in case when YA\mathbb{Y}\subset\mathcal{A}, or Y\mathbb{Y} is a quasi-normed solid space, any band preserving derivation from I\mathcal{I} into Y\mathbb{Y} is always trivial. At the same time, there exist non-zero band preserving derivations from I\mathcal{I} with values in S(A)S(\mathcal{A}), if and only if the Boolean algebra of all projections from the AWAW^*-algebra s(I)As(\mathcal{I})\mathcal{A} is not σ\sigma-distributive.

Keywords

Cite

@article{arxiv.1205.6083,
  title  = {Derivations on ideals in commutative $AW^*$-algebras},
  author = {V. I. Chilin and G. B. Levitina},
  journal= {arXiv preprint arXiv:1205.6083},
  year   = {2012}
}

Comments

22 pages