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A new 3-component Degasperis-Procesi hierarchy

We study the bi-Hamiltonian structures for the hierarchy of a 3-component generalization of the Degasperis-Procesi (3-DP) equation. We show that all Hamiltonian functionals in the hierarchy are homogenous, and Hamiltonian functionals of the hierarchy in the negative direction are local. We construct two different Liouville transformations by construct a reciprocal transformation. The associated system for the first one is a reduction of a negative flow in a modified Yajima-Oikawa hierarchy. The associated system for the second one and the associated system for another 3-component CH type system under a equivalent transformation are shown to be different reductions of a negative generalized mKdV equation, besides the Hamiltonian structures of the 3-DP equation under this Liouville transformation are considered. In addition, we consider a limit for the 3-DP equation.

preprint2020arXivOpen access
Nianhua Li
math-phmath.MPnlin.SI
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Nianhua Li

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