Handel’s fixed point theorem revisited

نویسنده

  • Juliana Xavier
چکیده

Michael Handel proved in [7] the existence of a fixed point for an orientation preserving homeomorphism of the open unit disk that can be extended to the closed disk, provided that it has points whose orbits form an oriented cycle of links at infinity. Later, Patrice Le Calvez gave a different proof of this theorem based only on Brouwer theory and plane topology arguments [9]. These methods permitted to improve the result by proving the existence of a simple closed curve of index 1. In this paper we describe all possible cycles of links implying the existence of fixed points. We also give a new, simpler proof of Le Calvez’s improved version of Handel’s theorem.

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Cycles of links and fixed points for orientation preserving homeomorphisms of the open unit disk

Michael Handel proved in [7] the existence of a fixed point for an orientation preserving homeomorphism of the open unit disk that can be extended to the closed disk, provided that it has points whose orbits form an oriented cycle of links at infinity. More recently, the author generalized Handel’s theorem to a wider class of cycles of links [13]. In this paper we complete this topic describing...

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تاریخ انتشار 2011