On a theorem by Treves
arXiv:nlin/0405007 · doi:10.1063/1.1777795
Abstract
According to a theorem of Treves, the conserved functionals of the KdV equation vanish on each formal Laurent series 1/x^2 + u0 + u2 x^2 + u3 x^3 + >... . We propose a new, very simple geometrical proof for this statement.
7 pages