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    1980
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    Hamiltonian structures
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    Lax equations
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    Poisson bracket
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    Kirillov bracket for the Lie algebra of formal Volterra operators
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    Gel'fand-Dikij family of brackets in the space of matrix differential operators of the first order
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    coadjoint action
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    hierarchy of Hamiltonian equations
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    Hamiltonian reduction with respect to the commutator subgroup
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