eng Science and Education Publishing Turkish Journal of Analysis and Number Theory 2333-1232 2018-07-11 6 4 111 115 10.12691/tjant-6-4-1 TJANT2018641 article Pembe Ipek Al ipekpembe@gmail.com 1 Zameddin I. Ismailov 2 Institute of Natural Sciences, Karadeniz Technical University, Turkey Department of Mathematics, Karadeniz Technical University, Turkey For the expression of all boundedly solvable extensions of the minimal operator generated by linear singular differential-operator expression for first order it has been applied Operator Theory Methods. Lastly, geometry of spectrum of these extensions is investigated. http://pubs.sciepub.com/tjant/6/4/1/tjant-6-4-1.pdf di?erential operator boundedly solvable operator spectrum