Complex Centers of Polynomial Differential Equations

Details Complex Centers of Polynomial Differential Equations Complex Centers of Polynomial Differential Equations

2007-03-10

arxiv.org/abs/math/0703280v1

Mathematics

Classical Analysis and ODEs

18 pages

Scientific paper

We present some results on the existence and nonexistence of centers for polynomial first order ordinary differential equations with complex coefficients. In particular, we show that binomial differential equations without linear terms do not complex centers. Classes of polynomial differential equations, with more than two terms, are presented that do not have complex centers. We also study the relation between complex centers and the Pugh problem. An algorithm is described to solve the Pugh problem for equations without complex centers. The method of proof involves phase plane analysis of the polar equations an a local study of periodic solutions.

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