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ISSN 1088-6850(e) ISSN 0002-9947(p)

The inverse integrating factor and the Poincaré map

Author(s): Isaac A. García; Héctor Giacomini; Maite Grau
Journal: Trans. Amer. Math. Soc. 362 (2010), 3591-3612.
MSC (2010): Primary 37G15, 37G20, 34C05
Posted: February 17, 2010
MathSciNet review: 2601601
Retrieve article in: PDF

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Abstract: This work is concerned with planar real analytic differential systems with an analytic inverse integrating factor defined in a neighborhood of a regular orbit. We show that the inverse integrating factor defines an ordinary differential equation for the transition map along the orbit. When the regular orbit is a limit cycle, we can determine its associated Poincaré return map in terms of the inverse integrating factor. In particular, we show that the multiplicity of a limit cycle coincides with the vanishing multiplicity of an inverse integrating factor over it. We also apply this result to study the homoclinic loop bifurcation. We only consider homoclinic loops whose critical point is a hyperbolic saddle and whose Poincaré return map is not the identity. A local analysis of the inverse integrating factor in a neighborhood of the saddle allows us to determine the cyclicity of this polycycle in terms of the vanishing multiplicity of an inverse integrating factor over it. Our result also applies in the particular case in which the saddle of the homoclinic loop is linearizable, that is, the case in which a bound for the cyclicity of this graphic cannot be determined through an algebraic method.

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