Perturbation theory for selfadjoint relations
arXiv:1806.07503
Abstract
We study Weyl-type perturbation theorems in the context of linear closed relations. We establish general results on perturbations for dissipative relations. In the particular case of selfadjoint relations, we study finite-rank perturbations and carry out a detailed analysis of the corresponding changes in the spectrum.
20 pages, no figures, typographical errors corrected and references added