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Information × Registration Number 0207U002420, 0106U011135 , R & D reports Title Direct and Inverse Problems for Differential Systems on Graphs popup.stage_title Head Pyvovarchyk Vyacheslav Mykolayovych, Registration Date 30-01-2007 Organization South Ukrainian State Pedagogical University popup.description2 Location of spectra of quadratic operator pencils with one-dimensional linear part is described. Alternative approach to description of spectra of such problems is developed using the theory of entire functions.The new class of Hermite-Biehler functions with defect is introduced which generalizes classical Hermite-Biehler functions. An analogue of classical Ambarzumian's theorem is proved for the case of arbitrary tree5635 Product Description popup.authors popup.nrat_date 2020-04-02 Close