TY CONF TI MATHEMATICAL METHODS FOR DATA APPROXIMATION KW data approximation KW C# programming language KW linear approximation KW polynomial approximation KW spline approximation KW approximation using neural networks KW MathNet KW ALGLIB KW Accord.NET JO MODELING INFORMATION SYSTEMS AND TECHNOLOGIES – 2025 AU Poluektov, A.V. AU Zarevich, A.I. AU Makarenko, F.V. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov