### Rank One Strong Singular Perturbation by Nonsymmetric Potential

#### Abstract

For a rank one strong singular perturbation of a self-adjoint operator by nonsymmetric potential, we present a construction and investigated the corresponding eigenvalue problem. Namely we consider the perturbations of the form

where *A* is a selfadjoint semi-bounded operator and

Such perturbation has an application in the theory of differential equations with retarded argument. The corresponding differential equations are the result of model control theory, particularly in electrical circuits. Examination conducted by methods of the theory of operators, including the application of the theory of extensions of densely defined symmetric operators to self-adjoint. Because the result is not self-adjoint operator, in considering building involved two symmetric operators, which is a narrowing of the original operator. This restrictions generated by different vectors of negative space

The presence of different vectors is the main difference between the proposed materials from previous studies in which perturbed operator was also self-adjoint. Also, the hallmark of previous publications is the fact that we consider a perturbation class . In a previous publication perturbation class was considered . The description problem is solved similarly to how the case was solved in a strictly singular perturbation symmetric potentials. Description is given by language of perturbed and unperturbed resolvents of operators, which are combined in a formula similar to Krein’s formula. Also in the paper we investigate the dot point, which appears by the operator

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DOI: https://doi.org/10.20535/1810-0546.2014.4.28216

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