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Abstract interpolation problem in generalized Nevanlinna classes


The abstract interpolation problem (AIP) in the Schur class was posed by V. Katznelson, A. Kheifets, and P. Yuditskii in 1987. In the present paper we consider an analog of AIP for the generalized Nevanlinna class $N_κ(L)$ in the nondegenerate case. We associate with the data set of the AIP a symmetric linear relation $\hat A$ acting in a Pontryagin space. The description of all solutions of the AIP is reduced to the problem of description of all $L$-resolvents of this symmetric linear relation $\hat A$. The latter set is parametrized by application of the indefinite version of Kreın’s representation theory for symmetric linear relations in Pontryagin spaces developed by M. G. Kreın and H. Langer in [22] and a formula for the $L$-resolvent matrix obtained by V. Derkach and M. Malamud in [11].

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TitleAbstract interpolation problem in generalized Nevanlinna classes
SourceMethods Funct. Anal. Topology, Vol. 18 (2012), no. 3, 266-287
MathSciNet   MR3051796
zbMATH 1258.47027
CopyrightThe Author(s) 2012 (CC BY-SA)

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Evgen Neiman
Department of Mathematics, Donets'k National University, 24 Universitets'ka, Donets'k, 83055, Ukraine 

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Evgen Neiman, Abstract interpolation problem in generalized Nevanlinna classes, Methods Funct. Anal. Topology 18 (2012), no. 3, 266-287.


@article {MFAT646,
    AUTHOR = {Neiman, Evgen},
     TITLE = {Abstract interpolation problem in generalized Nevanlinna classes},
   JOURNAL = {Methods Funct. Anal. Topology},
  FJOURNAL = {Methods of Functional Analysis and Topology},
    VOLUME = {18},
      YEAR = {2012},
    NUMBER = {3},
     PAGES = {266-287},
      ISSN = {1029-3531},
  MRNUMBER = {MR3051796},
 ZBLNUMBER = {1258.47027},
       URL = {},

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