Universal centers and composition conditions on the complex plane

 

 

Description

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.

Additional information

Author(s)

Valls, Claudia

DOI

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