On meromorphic equivalence of linear difference operators
Annales de l'Institut Fourier, Tome 40 (1990) no. 3, pp. 683-699.

On étudie des équations linéaires aux différences finies à coefficients méromorphes à l’infini. On caractérise les classes d’équivalence méromorphes de telles équations par un système d’invariants méromorphes. On démontre la liberté de ce systèmes en utilisant une méthode inspirée des travaux de G.D. Birkhoff.

We consider linear difference equations whose coefficients are meromorphic at ∞. We characterize the meromorphic equivalence classes of such equations by means of a system of meromorphic invariants. Using an approach inspired by the work of G. D. Birkhoff we show that this system is free.

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Immink, Gertrude K. On meromorphic equivalence of linear difference operators. Annales de l'Institut Fourier, Tome 40 (1990) no. 3, pp. 683-699. doi : 10.5802/aif.1228. http://www.numdam.org/articles/10.5802/aif.1228/

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