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math-ph2010★ 2 cited
Lie point symmetries of differential--difference equations
D. Levi, P. Winternitz, R. Yamilov
We present an algorithm for determining the Lie point symmetries of differential equations on fixed non transforming lattices, i.e. equations involving both continuous and discrete…
math-ph2010
-symmetries for discrete equations
D. Levi, M. A. Rodriguez
Following the usual definition of -symmetries of differential equations, we introduce the analogous concept for difference equations and apply it to some examples.