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Why do soliton equations come in hierarchies? - MaRDI portal

Why do soliton equations come in hierarchies? (Q3141397)

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Why do soliton equations come in hierarchies?
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    Why do soliton equations come in hierarchies? (English)
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    6 December 1993
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    operator identity
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    recursion operator
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    Lax pairs
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    complete integrability
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    hierarchy of nonlinear evolution equations
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    eigenfunctions
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    linear spectral problem
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