TY CONF TI IMPROVEMENT OF INTERRELATIONS BETWEEN MODULI OF SMOOTHNESS IN DIFFERENT METRICS KW moduli of smoothness KW metric JO OPERATOR EQUATIONS AND SOME RELATED ISSUES IN APPLIED MATHEMATICS AU Simonova, I.E. AU Igonina, T.R. AU Simonov, B.V. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov