Mel’nikov’s Function for Two-Dimensional Mappings

Abstract
This paper calculates explicitly the Mel’nikoV function for general perturbations of two-dimensional maps possessing a saddle connection. This result may be considered as the discrete analogue of Ziglin’s calculation of the Mel’nikoV function for time-periodic perturbations of two-dimensional continuous flows.Key words. integrable planar maps, perturbations, homoclinic orbits, Mel'nikoV's function, Poisson summation formula

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