| Subject | Operator theory | 
			
				| Title | Spectrum Structure of Solvable Pantograph Differential Operators for First Order | 
			
				| Author(s) | Z. I. Ismailov, E.O.Çevik, B.O.Guler and P.Ipek | 
			
				| Keywords | Pantograph differential operators; solvable extension; spectrum; resolvent operator | 
			
				| Abstract | In this work, based on M.I.Višik’s result all solvable extensions of the minimal operator generated by linear pantograph-type delay differential-operator expression for first order in Hilbert space of vector-functions at finite interval in terms of boundary values have been described. Later on, the spectrum structure of these extensions has been researched. |