On bounded solutions of linear systems of differential equations with unbounded coefficients

Roza E. Uteshova, Ye. V. Kokotova

BULLETIN OF THE KARAGANDA UNIVERSITY-MATHEMATICS, 2022

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DOI 10.31489/2022m4/107-116

Data confidence 70 medium

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Abstract

This paper deals with a problem of finding a bounded solution of a system of nonhomogeneous linear differential equations with an unbounded matrix of coefficients on a finite interval. The right-hand side of the equation belongs to a space of continuous functions bounded with some weight; the weight function is chosen taking into account the behavior of the coefficient matrix. The problem is studied using a modified version of the parameterization method with non-uniform partitioning. Necessary and sufficient conditions of well-posedness of the problem are obtained in terms of a bilaterally infinite matrix of special structure.