Nonlinear Analysis: Theory, Methods & Applications
Periodic boundary value problem for first-order impulsive functional differential equations
Journal of Computational and Applied Mathematics
Remarks on periodic boundary value problems for functional differential equations
Journal of Computational and Applied Mathematics
Periodic boundary value problems for second-order impulsive integro-differential equations
Journal of Computational and Applied Mathematics
Quasi-solutions for generalized second order differential equations with deviating arguments
Journal of Computational and Applied Mathematics
Periodic boundary value problems for first order functional differential equations with impulse
Journal of Computational and Applied Mathematics
Journal of Computational and Applied Mathematics
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This paper considers the existence of extreme solutions of the periodic boundary value problems for the second order functional differential equations. The novelty is that we introduce a new concept for lower and upper solutions and present that the method of lower and upper solutions coupled with monotone iterative technique is still valid. Meanwhile, we extend previous results.