Abstract
The wave operators for the pair of Sturm-Liouville operators corresponding to different nonlocal boundary conditions are considered. By analogy with an absolutely continuous subspace in the selfadjoint case a so-called essential subspace is defined. This definition is given for a pair of operators (not one operator only). In the case of the same finite sets of spectral singularities of two operators the similarity of corresponding semigroups is proved. The domain of definition of the semigroup has finite codimension.
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Cheremnikh, E.G. (2008). Wave Operators for Nonlocal Sturm-Liouville Operators with Trivial Potential. In: Janas, J., Kurasov, P., Naboko, S., Laptev, A., Stolz, G. (eds) Methods of Spectral Analysis in Mathematical Physics. Operator Theory: Advances and Applications, vol 186. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8755-6_3
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DOI: https://doi.org/10.1007/978-3-7643-8755-6_3
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