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Abstract An objective of this paper is to investigate the boundary value problem of a high-order nonlinear fractional q -difference equation. It was to obtain a unique iterative solution for this problem by means of applying a novel fixed-point theorem of - (h, r) ψ − (h, r) -concave operator, in which the operator is increasing and defined in ordered sets. Moreover, we construct a monotone explicit iterative scheme to approximate the unique solution. Finally, we give an example to illustrate the use of the main result.
Wang et al. (Tue,) studied this question.