In this work, we use the fixed-point theorem in double cones to study the
existence of multiple positive solutions for an impulsive first-order
differential system with integral boundary conditions, when the
nonlinearities change sign.
In this paper, we establish the existence of positive solutions to a periodic boundary problem associated with a first-order system under impulses effect and when the nonlinearities change sign. Our approach is based on the Krasnoselskii theorem in double cones. We generalize some recent results.MSC: 34B18, 34B37
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