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Exterior differential systems and prolongations for three important nonlinear partial differential equations

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  • Partial differential systems which have applications to water waves will be formulated as exterior differential systems. A prolongation structure is determined for each of the equations. The formalism for studying prolongations is reviewed and the prolongation equations are solved for each equation. One of these differential systems includes the Camassa-Holm and Degasperis-Procesi equations as special cases. The formulation of conservation laws for each of the systems introduced is discussed and a single example for each is given. It is shown how a Bäcklund transformation for the last case can be obtained using the prolongation results.
    Mathematics Subject Classification: Primary: 35G20, 35Q53, 37J35; Secondary: 37K25, 37K35, 55R10, 53Z05.


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