A symplectic proof of a theorem of Franks
2012; Cambridge University Press; Volume: 148; Issue: 6 Linguagem: Inglês
10.1112/s0010437x12000474
ISSN1570-5846
AutoresB. Collier, Ely Kerman, Benjamin Reiniger, Bolor Turmunkh, Andrew Zimmer,
Tópico(s)Mathematical Dynamics and Fractals
ResumoA celebrated theorem in two-dimensional dynamics due to John Franks asserts that every area preserving homeomorphism of the sphere has either two or infinitely many periodic points. In this work we reprove Franks' theorem under the additional assumption that the map is smooth. Our proof uses only tools from symplectic topology and thus differs significantly from all previous proofs. A crucial role is played by the results of Ginzburg and Kerman concerning resonance relations for Hamiltonian diffeomorpisms.
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