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A l g è b r e e t t h é o r i e d e s n o m b r e s Abstract. -The purpose of this survey is to provide the reader with a user friendly introduction to the two articles  and  , which give a Galoisian description of the action of an endomorphism of a differential field (K, ∂) on the solutions of a linear differential equation defined over (K, ∂). After having introduced the theory, we give some concrete examples. Résumé. -(Action d'un endormorphisme sur (les solutions d') une équationdoi:10.5802/pmb.28 fatcat:w2wweuoctncl5lm2d6vnekm7za