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math.FA2018
Weyl families of essentially unitary pairs
Rytis Jursenas
It is known that the Weyl families corresponding to unitary boundary pairs belong to the class of Nevanlinna families. Here we…
math.FA2018
The peak model for finite rank supersingular perturbations
Rytis Jursenas
In its original form the peak model for rank one supersingular perturbations of class or higher of a nonnegative self-adjoint operator requires that the Gram ma…