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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-22856

# Kappeler, T (1991). Fibration of the phase space for the Korteweg-de Vries equation. Annales de l'institut Fourier, 41(3):539-575.

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## Abstract

In this article we prove that the fibration of $L^ 2(S^ 1)$ by potentials which are isospectral for the 1-dimensional periodic Schrödinger equation, is trivial. This result can be applied, in particular, to $N$-gap solutions of the Korteweg-de Vries equation (KdV) on the circle: one shows that KdV, a completely integrable Hamiltonian system, has global action-angle variables.