Uniqueness theorems for operator-valued functions with positive imaginary part, and the singular spectrum in the selfadjoint Friedrichs model
The full report of results which were already announced in \textit{S. N. Naboko} [Dokl. Akad. Nauk SSSR 275, 1310-1313 (1984; Zbl 0587.47004); English translation in Soviet Math. Dokl. 29, 388-391 (1984)]. It gives a complete description of the singular spectrum in the Friedrichs model.
singular spectrum in the Friedrichs model
scientific article; zbMATH DE number 4028203
scientific article