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math.FA2010
Canonical Models For Bi-Isometries
Hari Bercovici, Ronald G. Douglas, Ciprian Foias
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 a…
math.FA2009★ 5 cited
Confluent operator algebras and the closability property
H. Bercovici, R. G. Douglas, C. Foias +1
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 c…