Nonlocal conservation laws of the constant astigmatism equation
arXiv:1602.06861 · doi:10.1016/j.geomphys.2016.06.002
Abstract
For the constant astigmatism equation, we construct a system of nonlocal conservation laws (an abelian covering) closed under the reciprocal transformations. We give functionally independent potentials modulo a Wronskian type relation.
21 pages