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arxiv: math/0005221 · v1 · submitted 2000-05-23 · 🧮 math.DG

Compatible Poisson brackets of hydrodynamic type

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keywords bracketscompatiblepoissonhydrodynamictypecaseclasscompatibility
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Some general properties of compatible Poisson brackets of hydrodynamic type are discussed, in particular: (1) an invariant differential-geometric criterion of the compatibility based on the Nijenhuis tensor; (2) the Lax pair with a spectral parameter governing compatible Poisson brackets in the diagonalizable case; (3) the connection of this problem with the class of surfaces in Euclidean space which possess nontrivial deformations preserving the Weingarten operator.

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