Unbounded Solutions of the Modified Korteweg-De Vries Equation

Details Unbounded Solutions of the Modified Korteweg-De Vries Equation Unbounded Solutions of the Modified Korteweg-De Vries Equation

2009-08-18

arxiv.org/abs/0908.2501v1

Mathematics

Analysis of PDEs

37 pages, preprint

Scientific paper

We prove local existence and uniqueness of solutions of the focusing modified Korteweg - de Vries equation $u_t + u^2u_x + u_{xxx} = 0$ in classes of unbounded functions that admit an asymptotic expansion at infinity in decreasing powers of $x$. We show that an asymptotic solution differs from a genuine solution by a smooth function that is of Schwartz class with respect to $x$ and that solves a generalized version of the focusing mKdV equation. The latter equation is solved by discretization methods.

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