REFERENCES
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- Hardouin , C. , Singer , M. ( 2008 ). Differential galois theory of linear difference equations . Math. Ann. 342 ( 2 ): 333 – 377 .
- Kolchin , E. R. ( 1973 ). Differential Algebra and Algebraic Groups. Pure and Applied Mathematics. Academic Press .
- van der Put , M. , Singer , M. ( 1997 ). Galois Theory of Difference Equations. Volume 1666 of Lecture Notes in Mathematics. Springer-Verlag .
- Communicated by D. Macpherson.