In the theory of dynamical systems, topological methods are often employed when the dynamics is too complicated to answer questions like the one about the existence of periodic orbits directly.
CITATION STYLE
Knauf, A. (2018). Symplectic Topology. In UNITEXT - La Matematica per il 3 piu 2 (Vol. 109, pp. 469–481). Springer-Verlag Italia s.r.l. https://doi.org/10.1007/978-3-662-55774-7_17
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