Lie Symmetries for Lattice Equations

@inproceedings{Levi2004LieSF,
  title={Lie Symmetries for Lattice Equations},
  author={Decio Levi},
  year={2004}
}
Lie symmetries has been introduced by Sophus Lie to study differential equations. It has been one of the most efficient way for obtaining exact analytic solution of differential equations. Here we show how one can extend this technique to the case of differential difference and difference equations. 

Figures from this paper

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TLDR
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