Journal
PHYSICS LETTERS A
Volume 355, Issue 6, Pages 452-459Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2005.09.089
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A new 4 x 4 isospectral problem with three potentials and the corresponding hierarchy of nonlinear evolution equations are presented. Especially, a new coupled KdV equation is produced. Their generalized bi-Hamiltonian structures are also investigated by using the trace identity. Moreover, a new finite-dimensional Hamiltonian system is given through the nonlinearization of the corresponding Lax pair. Enough conserved integrals, which are in involution and functionally independent, are created by the Lax operator to guarantee Liouville integrability of the Hamiltonian system. (c) 2006 Elsevier B.V. All rights reserved.
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