Fixed-point theorems for nonlinear operators with singular perturbations and applications
Agarwal, Ravi P
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Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P (2014). Fixed-point theorems for nonlinear operators with singular perturbations and applications. Journal of Inequalities and Applications ,
In this paper, using fixed-point index theory and approximation techniques, we consider the existence and multiplicity of fixed points of some nonlinear operators with singular perturbation. As an application we consider the existence and multiplicity of positive solutions of singular systems of multi-point boundary value problems, which improve the results in the literature.