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Stability of Hamiltonian Systems with Three Degrees of Freedom and the Three Body-Problem

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Results are obtained about formal stability and instability of Hamiltonian systems with three degrees of freedom, two equal frequencies and the matrix of the linear part is not diagonalizable, in terms of the coefficients of the development in Taylor series of the Hamiltonian of the system. The results are applied to the study of stability of the Lagrangian solutions of the Three Body-Problem in the case in which the center of mass is over the curve ρ*, on the border of the region of linear stability of Routh. The curve ρ* is divided symmetrically in three arcs in such a way that if the center of mass of the three particles lies on the central arc, the Lagrangian solution is unstable in the sense of Liapunov (in finite order), while if the center of mass determines one point that lies on one of the other two arcs of ρ*, then the Lagrangian solution is formally stable.

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Correspondence to José Edmundo Mansilla.

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Mansilla, J.E. Stability of Hamiltonian Systems with Three Degrees of Freedom and the Three Body-Problem. Celestial Mech Dyn Astr 94, 249–269 (2006).

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