### About the author

# Sharapudinov Idris Idrisovich

### The Head of the Department of mathematics and informatics, Dagestan scientific center, Russian academy of sciences, doctor of physical and mathematical sciences, professor. Research interests: functional analysis, the theory of functions of real variable, approximation theory, variable exponent Lebesgue space, orthogonal polynomials.

**Workplace**: Department of Mathematics and Informatics, Dagestan Scientific Center, Russian Academy of Sciences