Brief Communications

Description of Scattering Matrices of Unitary Extensions of Isometric Operators in Pontryagin Space

D. V. Baydyuk

Donetsk National University

Keywords: unitary extension of an isometric operator, scattering matrix, Pontryagin space, resolvent matrix, Nevanlinna-Pick problem, Weyl function, bitangent interpolation problem, Schur class.

Received: 28.01.2013

DOI: 10.4213/mzm10366

 English version: Mathematical Notes, 2013, 94:6, 958–962

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