Abstract
We prove that the existence of a holomorphic first integral of an analytic differential equation is an algebraically nonsolvable problem. Moreover, we prove a perturbation lemma showing that a nilpotent singularity of a differential equation in the plane cannont have a holomorphic first integral independently of the prolongation of anynth-order jet. We give an application to the case of nilpotent centers.
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Villarini, M. Algebraic nonsolvability of the problem of existence of holomorphic first integrals. Journal of Dynamical and Control Systems 1, 403–425 (1995). https://doi.org/10.1007/BF02269377
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DOI: https://doi.org/10.1007/BF02269377