First order maximally dissipative singular differential operators

In this paper, using the Calkin-Gorbachuk method, the general form of all maximal dissipative extensions of the minimal operator generated by first order linear multipoint symmetric singular differential-operator expression in the direct sum of Hilbert space of vector-functions has been found. Later on, the structure of spectrum of these extensions is researched. Finally, the results are supported by an application.

___

  • Bairamov, E., Öztürk Mert, R., Ismailov, Z. I., Selfadjoint extensions of a singular differential operator, J. Math. Chem., 50 (2012), 1100-1110.
  • Fischbacher, C., On the theory of dissipative extensions. PhD, University of Kent School of Mathematics, Statistic and Actuarial Science, Canterbury, England, 2017.
  • Gorbachuk, V. I., Gorbachuk, M. L., Boundary Value Problems for Operator Differential Equations, Dordrecht, the Netherlands, Kluwer Academic Publishers, 1991.
  • Hörmander, L., On the theory of general partial differential operators, Acta Mathematica, 94 (1955), 161-248.
  • Ismailov, Z. I., Ipek, P., Selfadjoint singular differential operators of first order and their spectrum, Electronic Journal of Differential Equations, 21 (2016), 1-9.
  • Nagy, Sz. B., Foias, C., Analyse Harmonique des Operateurs de L' espace de Hilbert, Masson, Paris and Akad Kiodo, Budapest, 1997, English transl. North-Holland, Amesterdam and Akad Kiado, Budapest, 1970.
  • Naimark, M. A., Linear Differential Operators, New York, USA, Frederick Ungar Publishing Company, 1968.
  • Rofe-Beketov, F. S., Kholkin, A. M., Spectral Analysis of Differential Operators, USA, World Scientific Monograph Series in Mathematics 7, 2005.
  • von Neumann, J., Allgemeine eigenwerttheories hermitescher funktionaloperatoren, Mathematische Annalen, 102 (1929-1930), 49-131 (in German).