358 citations · 1.1k across the 21 of their papers we have counts for
Showing 2010Show all
2 papers · 1 filter
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.FA2010
Contractions with Polynomial characteristic functions I. Geometric approach
Ciprian Foias, Jaydeb Sarkar
In this note we study the completely non unitary contractions on separable complex Hilbert spaces which have polynomial characteristic functions. These operators are precisely thos…