Abstract. The purpose of this paper is to prove the existence of a solution of the following periodic boundary value problemin the presence of an upper solution β and a lower solution α with β ≤ α, where f (t, u, v) satisfies one side Lipschitz condition.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.