machine graphic; cryptography; computer modeling; web-design.
Kalogeropulos G., Кossak О. The investigation of the numerical solution of the linearsyngular systems. Вісник Львів. Ун–ту// Сер. прикл. матем. інформ.// 2011. Вип.16..C. 88–95.
Kholyavka Ya., O. Kossak On arithmetic progressions on Legendreelliptic curves / Ya. Kholyavka, O. Kossak // The 9-th International Algebraic Conference in Ukraine: Abstract of Reports July 8-13 2013. –Lviv, 2013. – P. 87.
Kossak O., Savula Ya. The investigation of the deformations of the elastic bodies with thin coating using D-adaptive finite element model // Фізико математичне моделювання та інформаційні технології// Науковий збірник, випуск 12, 2010, с.102-112.
Born on August 23, 1958 in Lviv, in the family of English teachers. Studied at the Lviv secondary school №4 with in-depth study of English. Then he entered the Ivan Franko National University of Lviv on the faculty of applied mathematics. After graduation he worked in the research sector at the Department of Applied Mathematics. In 1992 defended the dissertation on the degree of candidate of physical-mathematics. Sciences. Currently he is Associate Professor of the Department of Applied Mathematics of Lviv Ivan Franko National University. Life-calling is to teach students and write books. In the last ten years, he has been actively collaborating with the universities of Athens and Salonica (Greece)