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On Closed Trajectories of an Autonomous Planar System with Not Necessarily Convex Constraint

  • J. Appell,
  • L. P. Petrova,
  • I. N. Pryadko,
  • S. Reinwand

摘要

This paper is concerned with the existence of a closed trajectory of an autonomous planar system with constraints. In contrast to previously known results, we do not require the constraint to be convex.