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with Charlotte Hardouin and Michael WibmerAdvances in Mathematics, 260 (2014), Pages 1--58. 

Abstract: 

We develop a Galois theory for linear differential equations equipped with the action of an endomorphism. This theory is aimed at studying the difference algebraic relations among the solutions of a linear differential equation. The Galois groups here are linear difference algebraic groups, i.e., matrix groups defined by algebraic difference equations.

doi: 10.1016/j.aim.2014.04.005

ArXiv:1302.7198..

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