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In Ref. 16, it was shown that the component of A along the central term of g should not be considered as an actual degree of freedom of the hierarchy. This is the reason why these hierarchies can be equivalently formulated both in terms of affine Kac-Moody algebras or of the corresponding loop algebras (see Sec. IV A for more details about this).
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i(s), then we have to impose further constraints on the group elements performing the dressing transformation (see Sec. IV B).
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31
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85033122044
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N among the solutions of the zero-curvature equations.
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85033116412
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note
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N's will be considered as generic changes of variables [see Eqs. (1) and (2)], we will not generally indicate the intrinsic dependence of the tau-functions on the group element h.
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85033108076
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i(t)〉 [see Eq. (34)].
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85033120941
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note
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A similar construction can be used to connect the solutions of the full generalized mkdV hierarchies with the solutions of the generalized non-Abelian Toda equations of Ref. 20.
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44
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