TY CONF TI ABOUT ONE "SMALL" ALGEBRA OF OPERATORS ACTING IN THE WEIGHT SPACES KW Hilbert n-tuple KW weight space JO OPERATOR EQUATIONS AND SOME RELATED ISSUES IN APPLIED MATHEMATICS AU Kabanko, M.V. AU Myagchenkova, E.L. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov