Abstract and Applied Analysis
Volume 2004 (2004), Issue 12, Pages 1057-1079
doi:10.1155/S1085337504403042

Periodic solutions for nonautonomous differential equations and inclusions in tubes

Abstract

We study the existence of periodic trajectories for nonautonomous differential equations and inclusions remaining in a prescribed compact subset of an extended phase space. These sets of constraints are nonconvex right-continuous tubes not satisfying the viability tangential condition on the whole boundary. We find sufficient conditions for existence of viable periodic trajectories studying properties of the exit subset of the tube. A new approximation approach for continuous multivalued maps is presented.