On reciprocal properties of the Caudrey-Dodd-Gibbon and Kaup-Kupershmidt hierarchies

New hierarchies of nonlinear evolution equations are introduced which are linked by reciprocal transformations to the Caudrey-Dodd-Gibbon and Kaup-Kupershmidt sequences. Invariance under a Mobius transformation of the singularity manifold equations for these sequences leads to a novel generic invariance property of the new systems. The latter have as base members Kawamoto-type equations. Explicit auto-Backlund transformations for the Caudry-Dodd-Gibbon and Kaup-Kuperschmidt hierarchies are generated via a reciprocal property.

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