COZMA, Dumitru; BECHET, Olesea
(Universitatea de Stat din Tiraspol, 2020)
We find conditions for a singular point 𝑂(0,0) of a center or a focus type to be a center, in a cubic differential system with two invariant straight lines and one invariant conic. The presence of a center at 𝑂(0,0) is ...