One-dimensional parameter-dependent boundary-value problems in Hölder spaces

Abstract

We study the most general class of linear boundary-value problems for systems of $r$-th order ordinary differential equations whose solutions range over the complex Hölder space $C^{n+r,\alpha }$, with $0\le n\in \mathbb{Z}$ and $0<\alpha \le 1$. We prove a constructive criterion under which the solution to an arbitrary parameter-dependent problem from this class is continuous in $C^{n+r,\alpha }$ with respect to the parameter. We also prove a two-sided estimate for the degree of convergence of this solution to the solution of the corresponding nonperturbed problem.