On approximation of high order singular perturbations

DOI10.1088/0305-4470/38/22/023zbMath1070.81052OpenAlexW2037085812MaRDI QIDQ5462480

Yuri Shondin

Publication date: 2 August 2005

Published in: Journal of Physics A: Mathematical and General (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1088/0305-4470/38/22/023

Mathematics Subject Classification ID

Linear symmetric and selfadjoint operators (unbounded) (47B25) Selfadjoint operator theory in quantum theory, including spectral analysis (81Q10) Singular perturbations of ordinary differential equations (34D15) Perturbation theories for operators and differential equations in quantum theory (81Q15) Spaces with indefinite inner product (Kre?n spaces, Pontryagin spaces, etc.) (46C20) Linear operators on spaces with an indefinite metric (47B50)

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Approximation of N κ ∞ -functions I: Models and Regularization

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