Singular Perturbations and Operators in Rigged Hilbert Spaces

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A notion of regularity and singularity for a special class of operators acting in a rigged Hilbert space D⊂H⊂D× is proposed and it is shown that each operator decomposes into a sum of a regular and a singular part. This property is strictly related to the corresponding notion for sesquilinear forms. A particular attention is devoted to those operators that are neither regular nor singular, pointing out that a part of them can be seen as perturbation of a self-adjoint operator on H. Some properties for such operators are derived and some examples are discussed.
Lingua originaleEnglish
pagine (da-a)2011-2024
Numero di pagine14
RivistaMediterranean Journal of Mathematics
Stato di pubblicazionePublished - 2016

All Science Journal Classification (ASJC) codes

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