Geodesic
Algebraic and Differential Nonlinear Superposition Formulas
Teoretičeskaâ i matematičeskaâ fizika, Tome 137 (2003) no. 1, pp. 87-96 Cet article a éte moissonné depuis la source Math-Net.Ru

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Knowledge of the Lax pair and the Darboux transformation for a completely integrable system provides an iterative approach for generating exact solutions. This approach involves solving for the eigenfunction of the Lax pair at each step. But this process can be considerably simplified using the Bдcklund transformation and Bianchi's permutability theorem. This allows constructing the so-called nonlinear superposition formula, which provides a new solution of the system in terms of three previous solutions. The advantage of this approach is that the differential order of the nonlinear superposition formulas is lower than that of the Lax pairs, and in some cases, these formulas reduce to algebraic equations. We consider the construction of new nonlinear superposition formulas in the form of both differential equations and algebraic equations.
Keywords: nonlinear superposition formula, Bäcklund transformations. 
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P. R. Gordoa. Algebraic and Differential Nonlinear Superposition Formulas. Teoretičeskaâ i matematičeskaâ fizika, Tome 137 (2003) no. 1, pp. 87-96. http://geodesic.mathdoc.fr/item/TMF_2003_137_1_a9/

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