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 Elliptic Birkhoff's billiards with $C^2$-generic global perturbations Bull. Korean Math. Soc. 1999 Vol. 36, No. 1, 147-159 Gwang-Il Kim Gyeongsang National University Abstract : Tabanov investigated the {\it global symmetric} perturbation of the integrable billiard mapping in the ellipse \cite{3}. He showed the nonintegrability of the Birkhoff billiard in the perturbed domain by proving that the principal separatrices splitting angle is not zero. In this paper, using the {\it exact separatrix map} of an one-degree-of-freedom Hamiltonian system with time periodic perturbation, we show the existence the stochastic layer including the uniformly hyperbolic invariant set which implies the nonintegrability near the separatrices of a Birkhoff's billiard in the domain bounded by a $C^2$ convex simple curve constructed by the {\it generic global} perturbation of the ellipse. Keywords : irkhoff's billiard, twist map, Hamiltonian system, separatrix, separatrix map, uniform hyperbolicity MSC numbers : 34C35, 58F39 Full-Text :