S. I. Pozdeeva
Tomsk State Pedagogical University ; Azov State Pedagogical University
Russian Federation

Pozdeeva Svetlana I. – Doctor of Pedagogical Sciences, Рrofessor, Head of the Department of Pedagogy and Methodology of Elementary Education

Tomsk;  Azov 

E. G. Gelfman
Tomsk State Pedagogical University
Russian Federation

Gelfman Emanuila G. – Doctor of Pedagogical Sciences, Рrofessor, Professor of the Department of Mathematics, Theory and Methodology of Mathematics Education

Tomsk

A. A. Nikitin
S. L. Sobolev Institute of Mathematics Siberian Branch of the Russian Academy of Sciences
Russian Federation

Nikitin Aleksandr A. – Doctor of Physical and Mathematical Sciences, Рrofessor, Academician of the Russian Academy of Sciences, Leading Researcher

Novosibirsk