Abstract
Abstract The Jacobi inversion problems of negative and mixed Toda hierarchies are investigated through a symplectic map and some finite-dimensional Hamiltonian systems. Each negative equation is decomposed into the symplectic flow and a negative Hamiltonian flow, each mixed equation is decomposed into the symplectic flow and a mixed Hamiltonian flow. The separated variables are introduced to study these Hamiltonian systems. Based on the Hamilton–Jacobi theory, the relationship between the action-angle coordinates and the Jacobi-inversion problems is established.
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