carpathian_2021_37_1_127_133_001

Universal centers and composition conditions on the complex plane


Valls, Claudia


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carpathian_2021_37_1_127_133

 

 

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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Author(s)

Valls, Claudia

DOI

https://doi.org/10.37193/CJM.2021.01.13