Maximal one-dimensional Lyapunov exponent and singular-point analysis for a quartic Hamiltonian

Abstract
A singular-point analysis for a quartic Hamiltonian which depends on a parameter is performed. Moreover, the maximal one-dimensional Lyapunov exponent is calculated numerically. It turns out that if two of the resonances determined by the singular-point analysis become complex, then the maximal one-dimensional Lyapunov exponent is larger than 0.

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