Neeru Bala, Santanu Dey, Reshmi M. N
Published 2023-01-31Version 1
The characteristic function of row contractions and liftings of row contractions are complete invariants up to unitary equivalence for row contractions and liftings of row contractions, respectively. We provide alternate proofs for these using colligations. A class of co-isometric observable colligations with input spaces of finite dimension is characterized. Blaschke factor based transformations of the characteristic function of lifting are studied.
Factorization of Characteristic Functions of Iterated Liftings
Factorizations of Characteristic Functions
Characteristic functions and joint invariant subspaces
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