Geodesic
Solution of the $1 : {−}2$ resonant center problem in the quadratic case
Fundamenta Mathematicae, Tome 157 (1998) no. 2, pp. 191-207.

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The 1:-2 resonant center problem in the quadratic case is to find necessary and sufficient conditions (on the coefficients) for the existence of a local analytic first integral for the vector field $(x + A_1x^2 + B_1xy + Cy^2) ∂_x+(-2y + Dx^2 + A_2xy + B_2y^2)∂_y$. There are twenty cases of center. Their necessity was proved in [4] using factorization of polynomials with integer coefficients modulo prime numbers. Here we show that, in each of the twenty cases found in [4], there is an analytic first integral. We develop a new method of investigation of analytic properties of polynomial vector fields.
DOI : 10.4064/fm-157-2-3-191-207

Alexandra Fronville 1 ; Anton P. Sadovski 1 ; Henryk Żołądek 1

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Alexandra Fronville; Anton P.  Sadovski; Henryk Żołądek. Solution of the $1 : {−}2$ resonant center problem in the quadratic case. Fundamenta Mathematicae, Tome 157 (1998) no. 2, pp. 191-207. doi : 10.4064/fm-157-2-3-191-207. http://geodesic.mathdoc.fr/articles/10.4064/fm-157-2-3-191-207/

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