On the Treves theorem for the AKNS equation

Details On the Treves theorem for the AKNS equation On the Treves theorem for the AKNS equation

2004-07-09

arxiv.org/abs/nlin/0407025v1

J.Math.Phys. 45(12), 4737-4753 (2004)

Nonlinear Sciences

Exactly Solvable and Integrable Systems

LaTeX, 16 pages

Scientific paper

According to a theorem of Treves, the conserved functionals of the AKNS equation vanish on all pairs of formal Laurent series of a specified form, both of them with a pole of the first order. We propose a new and very simple proof for this statement, based on the theory of B\"acklund transformations; using the same method, we prove that the AKNS conserved functionals vanish on other pairs of Laurent series. The spirit is the same of our previous paper on the Treves theorem for the KdV, with some non trivial technical differences.

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