116 citations · 762 across the 46 of their papers we have counts for
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math-ph2003★ 16 cited
Discrete q-derivatives and symmetries of q-difference equations
D. Levi, J. Negro, M. A. del Olmo
In this paper we extend the umbral calculus, developed to deal with difference equations on uniform lattices, to q-difference equations. We show that many of the properties conside…
math-ph2003★ 7 cited
Lie discrete symmetries of lattice equations
Decio Levi, Miguel A. Rodríguez
We extend two of the methods previously introduced to find discrete symmetries of differential equations to the case of difference and differential-difference equations. As an exam…