 Hénon–Heiles system

The Hénon-Heiles system is a Hamiltonian system with two degrees of freedom and Hamiltonian functionIts Hamilton's equations give $\ddot{x}=-x-2xy$ and $\ddot{y}=-y-x^2+y^2$. Its potential energy combines an isotropic quadratic minimum with a cubic interaction.

The Hénon–Heiles system is a classic model in dynamical systems and astrophysics that describes the motion of a particle in a two-dimensional potential well. This system is specifically notable for its chaotic behavior and is often used as a prototypical example of non-integrable Hamiltonian systems.