On nonlocal symmetries for the Krichever--Novikov equation
arXiv:1111.5796 · doi:10.1016/j.physleta.2012.02.053
Abstract
We construct new infinite hierarchies of nonlocal symmetries and cosymmetries for the Krichever--Novikov equation using the inverse of the fourth-order recursion operator of the latter.
11 pages, no figures