Mathematics – Functional Analysis
Scientific paper
2010-12-04
Mathematics
Functional Analysis
Scientific paper
A canonical model, analogous to the one for contraction operators, is introduced for bi-isometries, two commuting isometries on a Hilbert space. This model involves a contractive analytic operator-valued function on the unit disk. Various pureness conditions are considered as well as bi-isometries for which both isometries are shifts. Several families of examples are introduced and classified.
Bercovici Hari
Douglas Ronald G.
Foias Ciprian
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