The paper presents explicit second invariant symplectic forms for four Hamiltonian systems, including the non-integrable Henon-Heiles system.
On tensor invariants for integrable cases of Euler, Lagrange and Kovalevskaya rigid body motion
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abstract
We discuss global tensor invariants of a rigid body motion in the cases of Euler, Lagrange and Kovalevskaya. These invariants are obtained by substituting tensor fields with cubic on variable components into the invariance equation and solving the resulting algebraic equations using computer algebra systems. According to the Poincar\'{e}-Cartan theory of invariants, the existence of invariant geometric structures raises the question of using them to study the dynamics.
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Multisymplectic structure of nonintegrable Henon-Heiles system
The paper presents explicit second invariant symplectic forms for four Hamiltonian systems, including the non-integrable Henon-Heiles system.