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JOURNALS // Chebyshevskii Sbornik // Archive

Chebyshevskii Sb., 2025 Volume 26, Issue 4, Pages 356–368 (Mi cheb1600)

A highly accurate and efficient method for studying the dynamics of derivatives of different orders of a singularly perturbed equation

Ch. B. Normurodov, N. T. Dzhuraeva, M. M. Normatova

Termez State University (Termez, Uzbekistan)

Abstract: The purpose of this article is to construct a highly accurate and efficient numerical method for studying the dynamics of derivatives of various orders of a singularly perfected differential equation. In the method of preliminary integration of the highest derivative, the equations and the right part are represented as finite series according to Chebyshev polynomials of the first kind with unknown expansion coefficients. Before solving the problem, the selected series is pre-integrated and expressions are found in the form of series for all lower derivatives and the desired solution. Unknown constants appearing during series integration are determined from additional conditions of the problem. Unknown coefficients are determined from a system of algebraic equations and putting them in the right series, the derivatives and the solution of the problem are calculated.

Keywords: singularly perturbed problem, preliminary integration method.

UDC: 517.9+517.5+519.6

Received: 01.02.2025
Accepted: 17.10.2025

Language: English

DOI: 10.22405/2226-8383-2025-26-4-356-368



© Steklov Math. Inst. of RAS, 2026