Ismailov, ZameddinAl, Pembe İpek2021-11-122021-11-122020-06-30https://doi.org/10.31801/cfsuasmas.643349http://hdl.handle.net/20.500.12575/76042In 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.enDissipative differential operatorSelfadjoint differential operatorDeficiency indexArticle6919299402618-6470