The Krein Formula for Generalized Resolvents in Degenerated Inner Product Spaces

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作者
Michael Kaltenbäck
Harald Woracek
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[1] Technische Universität Wien,
[2] Austria,undefined
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1991 Mathematics Subject Classification: 47B50; 47B25; 42A82; Key words: Selfadjoint operator; Pontryagin space; generalized resolvent;
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 Let S be a symmetric operator with defect index (1,1) in a Pontryagin space ℋ. The Krein formula establishes a bijective correspondence between the generalized resolvents of S and the set of Nevanlinna functions as parameters. We give an analogue of the Krein formula in the case that ℋ is a degenerated inner product space. The set of parameters is determined by a kernel condition. These results are applied to some classical interpolation problems with singular data.
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页码:119 / 140
页数:21
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