Confluent operator algebras and the closability property

Details Confluent operator algebras and the closability property Confluent operator algebras and the closability property

2009-08-05

arxiv.org/abs/0908.0729v2

Mathematics

Functional Analysis

Preliminary version

Scientific paper

Certain operator algebras A on a Hilbert space have the property that every densely defined linear transformation commuting with A is closable. Such algebras are said to have the closability property. They are important in the study of the transitive algebra problem. More precisely, if A is a two-transitive algebra with the closability property, then A is dense in the algebra of all bounded operators, in the weak operator topology. In this paper we focus on algebras generated by a completely nonunitary contraction, and produce several new classes of algebras with the closability property. We show that this property follows from a certain strict cyclicity property, and we give very detailed information on the class of completely nonunitary contractions satisfying this property, as well as a stronger property which we call confluence.

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