Authors: Dumitru Cozma
Keywords: Cubic differential system, center-focus problem, invariant algebraic curve, integrability
– 0.18 Mb
Keywords: Cubic differential system, center-focus problem, invariant algebraic curve, integrability
Abstract
For a class of cubic differential systems with a bundle of two invariant straight lines and one invariant conic it is proved that a weak focus is a center if and only if the first four Liapunov quantities Lj , j = 1, 4 vanish.Fulltext
– 0.18 Mb
