On the Computation of Approximate Solution to Ordinary Differential Equations by the Chebyshev Series Method and Estimation of Its Error

Abstract

An approximate method for solving the Cauchy problem for nonlinear first-order ordinary differential equations is considered. The method is based on using the shifted Chebyshev series and a Markov quadrature formula. Some approaches are given to estimate the error of an approximate solution expressed by a partial sum of a certain order series. The error is estimated using the second approximation of the solution expressed by a partial sum of a higher order series. An algorithm for partitioning the integration interval into elementary subintervals to ensure the computation of the solution with a prescribed accuracy is constructed on the basis of the proposed approaches to error estimation.