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A $$C^2$$-smooth counterexample to the Hamiltonian Seifert conjecture in $$\mathbb R^4$$. (English) Zbl 1140.37356
Summary: We give a detailed construction of a proper $$C^2$$-smooth function on $$\mathbb R^4$$ such that its Hamiltonian flow has no periodic orbits on at least one regular level set. This result can be viewed as a $$C^2$$-smooth counterexample to the Hamiltonian Seifert conjecture in dimension four.

##### MSC:
 37J45 Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods (MSC2010) 37C27 Periodic orbits of vector fields and flows 37J05 Relations of dynamical systems with symplectic geometry and topology (MSC2010) 53D35 Global theory of symplectic and contact manifolds 57R25 Vector fields, frame fields in differential topology
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