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• W3180200290 abstract "During the last forty years the theory of integrability of Darboux, in terms of algebraic invariant curves of polynomial systems has been very much extended and it is now an active area of research. These developments are covered in numerous papers and several books, not always following the conceptual historical evolution of the subject and its significant connections to Poincare’s problem of the center. Our first goal is to give in a concise way, following the history of the subject, its conceptual development. Our second goal is to display the many aspects of the theory of Darboux we have today, by using it for studying the special family of planar quadratic differential systems possessing an invariant hyperbola, and having either two singular points at infinity or the infinity filled up with singularities. We prove the integrability for systems in 11 of the 13 normal forms of the family and the generic non-integrability for the other 2 normal forms. We construct phase portraits and bifurcation diagrams for 5 of the normal forms of the family, show how they impact the changes in the geometry of the systems expressed in their configurations of their invariant algebraic curves and point out some intriguing questions on the interplay between this geometry and the integrability of the systems. We also solve the problem of Poincare of algebraic integrability for 4 of the normal forms we study." @default.
• W3180200290 created "2021-07-19" @default.
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• W3180200290 date "2021-01-01" @default.
• W3180200290 modified "2023-10-16" @default.
• W3180200290 title "Geometry, integrability and bifurcation diagrams of a family of quadratic differential systems as application of the Darboux theory of integrability" @default.
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• W3180200290 doi "https://doi.org/10.14232/ejqtde.2021.1.45" @default.
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