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C -Subalgebras Generated by a Single Operator in B(H)
Journal article   Peer reviewed

C -Subalgebras Generated by a Single Operator in B(H)

Ilwoo Cho and Palle E. T Jorgensen
Acta applicandae mathematicae, Vol.108(3), pp.625-664
12/2009
DOI: 10.1007/s10440-009-9478-5

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Abstract

In this paper, we characterize a C *-subalgebra C *(x) of B(H), generated by a single operator x. We show that if x is polar-decomposed by aq, where a is the partial isometry part and q is the positive operator part of x, then C *(x) is *-isomorphic to the groupoid crossed product algebra Aq×αGa , where Aq=C∗(q) and Ga is the graph groupoid induced by a partial isometry part a of x.

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