Cyclicity of a simple focus via the vanishing multiplicity of inverse integrating factors
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First we provide new properties about the vanishing multiplicity of the inverse integrating factor of a planar analytic differential system at a focus. After we use this vanishing multiplicity for studying the cyclicity of some simple foci of several classes of planar analytic differential systems.
Is part ofJournal of Differential Equations, 2013, vol. 255, núm. 11, p. 3880-3896
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