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- W2037085812 abstract "Let L be a non-negative self-adjoint operator in a Hilbert space H0 with inner product �· , ·� 0 and let ϕ be a singular element belonging to H−k−1H−k with k 2 (high order), where {Hs} ∞=−∞ is the scale of Hilbert spaces associated with L in H. For the formal singular perturbation of L generated by ϕ self-adjoint realizations H( g) in a Pontryagin space are considered and approximations of these realizations by suitable smoother models are investigated. The realizations H( g)are described by k real parameters (gs) k=1 and given in a Pontryagin space �( ¯ g) of the form H0 ⊕ C m ⊕ C m , which is" @default.
- W2037085812 created "2016-06-24" @default.
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- W2037085812 date "2005-05-18" @default.
- W2037085812 modified "2023-09-25" @default.
- W2037085812 title "On approximation of high order singular perturbations" @default.
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- W2037085812 doi "https://doi.org/10.1088/0305-4470/38/22/023" @default.
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