Universal centers and composition conditions on the complex plane


Valls, Claudia


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We characterize the universal centers of the ordinary differential equations in the complex plane d \rho/d \theta=\sum_{i=1}^\infty a_i(\theta) \rho^{i+1}, where a_i(\theta) are trigonometric polynomials with complex coefficients, in terms of the composition conditions.

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Valls, Claudia