2 papers
math.FA2025
Characteristic function of a power partial isometry
Kritika Babbar, Amit Maji
The celebrated Sz.-Nagy-FoiaÅ model theory says that there is a bijection between the class of purely contractive analytic functions and the class of completely non-unitary (c.n.u…
math.FA2025
Power partial isometries
Kritika Babbar, Amit Maji
In this paper we obtain a complete characterization of reducing, invariant, and hyperinvariant subspaces for the completely non-unitary component of a power partial isometry. In pa…