Abstract
We show that under certain technical assumptions any weakly nonlocal Hamil- tonian structure compatible with a given nondegenerate weakly nonlocal symplectic struc- ture J can be written as the Lie derivative of J 1 along a suitably chosen nonlocal vector field. Moreover, we present a new description for local Hamiltonian structures of arbitrary order compatible with a given nondegenerate local Hamiltonian structure of zero or first order, including Hamiltonian operators of the Dubrovin-Novikov type.
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