Sc. Hu et Ns. Papageorgiou, ON THE EXISTENCE OF PERIODIC-SOLUTIONS FOR NONCONVEX-VALUED DIFFERENTIAL-INCLUSIONS IN R(N), Proceedings of the American Mathematical Society, 123(10), 1995, pp. 3043-3050
In this paper we investigate the existence of periodic solutions for d
ifferential inclusions with nonconvex-valued orienter field. Using a t
angential condition and directionally continuous selectors, we establi
sh the existence of periodic trajectories.