S. Zabelina
Federal State University of Education
Russian Federation

Svetlana B. Zabelina, Cand. Sci. (Education), Assoc. Prof.

Department of Higher Algebra, Mathematical Analysis and Geometry

Moscow; Moscow Region; Lyubertsy

I. Pinchuk
Federal State University of Education
Russian Federation

Irina A. Pinchuk, Cand. Sci. (Phys.-Math.), Assoc. Prof.

Department of Higher Algebra, Mathematical Analysis and Geometry

Moscow

L. Gritskova
Federal State University of Education
Russian Federation

Lyudmila S. Gritskova, Assistant Lecturer

Department of Higher Algebra, Mathematical Analysis and Geometry

Moscow; Moscow Region; Chekhov

S. Shammai Irani
Federal State University of Education
Russian Federation

Suzanna M. Shammai Irani, Postgraduate Student

Department of Higher Algebra, Mathematical Analysis and Geometry

Moscow; Moscow Region; Reutov