On the Regularization Mechanism for the Periodic Korteweg-de Vries Equation
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In this paper we develop and use successive averaging methods for explaining the regularization mechanism in the the periodic Korteweg-de Vries (KdV) equation in the homogeneous Sobolev spaces s for s 0. Specifically, we prove the global existence, uniqueness, and Lipschitz-continuous dependence on the initial data of the solutions of the periodic KdV. For the case where the initial data is in L2 we also show the Lipschitz-continuous dependence of these solutions with respect to the initial data as maps from s to s for s (-1,0]. 2010 Wiley Periodicals, Inc.