# Talk:KdV-type equations

It seems that the formula for the symplectic structure is false. It should be intead:

${\displaystyle \omega (u,v)=\int _{\mathbb {R} }u(\partial _{x})^{-1}v}$

(Reference doi:10.1007/BF02588080)

Thanks! I changed it. Colliand 14:24, 1 October 2008 (EDT)