Characteristic functions of almost soluble expansion of the Hermitian operators

• Date: 1992
• Main Authors: Derkach , V. A., Malamud , M. M., Деркач , В. А., Маламуд , М. М.
• Format: Article
• Language: Russian
• Published: Institute of Mathematics, NAS of Ukraine 1992
• Online Access: https://umj.imath.kiev.ua/index.php/umj/article/view/7885
• Journal Title: Ukrains’kyi Matematychnyi Zhurnal

The characteristic operator-functions W(λ) are studied of the almost solvable extensions of an Hermitian operator. The inverse problem is solved, a multiplication theorem is proved, and a formula is derived expressing W(λ) in terms of the Weyl function and the boundary operator. Characteristic funct...