Coverings over lax integrable equations and their nonlocal symmetries

@article{Baran2015CoveringsOL,
  title={Coverings over lax integrable equations and their nonlocal symmetries},
  author={H. Baran and I. Krasil’shchik and O. Morozov and P. Voj{\vc}ak},
  journal={Theoretical and Mathematical Physics},
  year={2015},
  volume={188},
  pages={1273-1295}
}
We consider the three-dimensional rdDym equation uty = uxuxy −uyuxx. Using the known Lax representation with a nonremovable parameter and two hierarchies of nonlocal conservation laws associated with it, we describe the algebras of nonlocal symmetries in the corresponding coverings. 

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