On the existence of periodic solutions for nonconvex differential inclusions
Dimitrios Kravvaritis, Nikolaos S. Papageorgiou (1996)
Archivum Mathematicum
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Using a Nagumo type tangential condition and a recent theorem on the existence of directionally continuous selector for a lower semicontinuous multifunctions, we establish the existence of periodic trajectories for nonconvex differential inclusions.