TY CONF TI APPROXIMATE SOLUTION OF A POLYLINEAR PARABOLIC EQUATION KW Banach space KW linear operator KW Cauchy problem KW Tonelli's method JO OPERATOR EQUATIONS AND SOME RELATED ISSUES IN APPLIED MATHEMATICS AU Spirina, N.M. AU Sapronov, I.V. AU Venevitina, S.S. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov