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Hamiltonian structures and their reciprocal transformations for the r-KdV–CH hierarchy
Journal of Geometry and Physics,2009,59(9):1227-1243 | 2009年09月01日 | https://doi.org/10.1016/j.geomphys.2009.06.001
The r-KdV–CH hierarchy is a generalization of the Korteweg–de Vries and Camassa–Holm hierarchies parameterized by r+1 constants. In this paper we clarify some properties of its multi-Hamiltonian structures including the explicit expressions of the Hamiltonians, the formulae of the central invariants of the associated bihamiltonian structures and the relationship of these bihamiltonian structures with Frobenius manifolds. By introducing a class of generalized Hamiltonian structures, we present in a natural way the transformation formulae of the Hamiltonian structures of the hierarchy under certain reciprocal transformations, and prove the validity of the formulae at the level of dispersionless limit.
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