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Search: MSC category 47B50 ( Operators on spaces with an indefinite metric [See also 46C50] )

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1. CJM 2005 (vol 57 pp. 61)

 On Operators with Spectral Square but without Resolvent Points Decompositions of spectral type are obtained for closed Hilbert space operators with empty resolvent set, but whose square has closure which is spectral. Krein space situations are also discussed. Keywords:unbounded operators, closed operators,, spectral resolution, indefinite metricCategories:47A05, 47A15, 47B40, 47B50, 46C20

2. CJM 2002 (vol 54 pp. 1142)

Binding, Paul; Ćurgus, Branko
 Form Domains and Eigenfunction Expansions for Differential Equations with Eigenparameter Dependent Boundary Conditions Form domains are characterized for regular $2n$-th order differential equations subject to general self-adjoint boundary conditions depending affinely on the eigenparameter. Corresponding modes of convergence for eigenfunction expansions are studied, including uniform convergence of the first $n-1$ derivatives. Categories:47E05, 34B09, 47B50, 47B25, 34L10
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