Two types of new integrable decompositions of the Kaup-Newell equation. (English) Zbl 1142.37359

Summary: Two types of new integrable decompositions of the Kaup-Newell equation are presented. The first one comes from the nonstandard binary nonlinearization of the well-known \(2 \times 2\) Kaup-Newell spectral problems and the other comes from the standard binary nonlinearization of new \(3 \times 3\) Kaup-Newell spectral problems. The relationship between them is revealed.


37K10 Completely integrable infinite-dimensional Hamiltonian and Lagrangian systems, integration methods, integrability tests, integrable hierarchies (KdV, KP, Toda, etc.)
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