Abstract
For a class of selfadjoint operators in a Krein space containing the definitizable selfadjoint operators a funetional calculus and the spectral function are studied. Stability properties of the spectral function with respect to small compact perturbations of the resolvent are proved.
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Jonas, P. On a class of selfadjoint operators in Krein space and their compact perturbations. Integr equ oper theory 11, 351–384 (1988). https://doi.org/10.1007/BF01202078
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DOI: https://doi.org/10.1007/BF01202078