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Krasnoselskii type fixed point theorems and applications
Authors:Yicheng Liu   Zhixiang Li
Affiliation:Department of Mathematics and System Science, College of Science, National University of Defense Technology, Changsha, 410073, People's Republic of China. ; Department of Mathematics and System Science, College of Science, National University of Defense Technology, Changsha, 410073, People's Republic of China.
Abstract:In this paper, we establish two fixed point theorems of Krasnoselskii type for the sum of $ A+B$, where $ A$ is a compact operator and $ I-B$ may not be injective. Our results extend previous ones. As an application, we apply such results to obtain some existence results of periodic solutions for delay integral equations and then give three instructive examples.

Keywords:Fixed point theorem   separate contraction mapping   periodic solution   multi-valued mapping   delay integral equation.
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