N.I. Chervyakov - Dr.Sc. (Eng.), Professor, Head of Department of the Applied Mathematics and Mathematical Modeling, Institute of Mathematics and Natural Sciences, North Caucasus Federal University (Stavropol). E-mail: k-fmf-primath@stavsu.ru P.A. Lyakhov - Ph.D. (Phis.-Math.), Assistant Professor, Department of the Applied Mathematics and Mathematical Modeling, Institute of Mathematics and Natural Sciences, North Caucasus Federal University (Stavropol). E-mail: ljahov@mail.ru N.F. Semyonova - Ph.D. (Phis.-Math.), Assistant Professor, Department of the Algebra and Geometry, Institute of Mathematics and Natural Sciences, North Caucasus Federal University (Stavropol). E-mail: nfsemyonova@mail.ru M.V. Valueva - Master student in «Applied Mathematics and Informatics», Institute of Mathematics and Natural Sciences, North Caucasus Federal University (Stavropol). E-mail: mriya.valueva@mail.ru