Abstract
We discuss purely singular finite-rank perturbations of a self-adjoint operator A in a Hilbert space ℋ. The perturbed operators \(\tilde A\) are defined by the Krein resolvent formula \((\tilde A - z)^{ - 1} = (A - z)^{ - 1} + B_z \), Im z ≠ 0, where B z are finite-rank operators such that dom B z ∩ dom A = |0}. For an arbitrary system of orthonormal vectors \(\{ \psi _i \} _{i = 1}^{n < \infty } \) satisfying the condition span |ψ i } ∩ dom A = |0} and an arbitrary collection of real numbers \({\lambda}_i \in {\mathbb{R}}^1\), we construct an operator \(\tilde A\) that solves the eigenvalue problem \(\tilde A\psi _i = {\lambda}_i {\psi}_i , i = 1, \ldots ,n\). We prove the uniqueness of \(\tilde A\) under the condition that rank B z = n.
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Dudkin, M.E., Koshmanenko, V.D. On the Point Spectrum of Self-Adjoint Operators That Appears under Singular Perturbations of Finite Rank. Ukrainian Mathematical Journal 55, 1532–1541 (2003). https://doi.org/10.1023/B:UKMA.0000018014.09570.ef
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DOI: https://doi.org/10.1023/B:UKMA.0000018014.09570.ef