UPPER BOUNDS FOR THE NUMBER OF LIMIT CYCLES OF SOME PLANAR POLYNOMIAL DIFFERENTIAL SYSTEMS

被引:7
|
作者
Gasull, Armengol [1 ]
Giacomini, Hector [2 ]
机构
[1] Univ Autonoma Barcelona, Dept Matemat, E-08193 Barcelona, Spain
[2] Univ Tours, Fac Sci & Tech, CNRS, Lab Math & Phys Theor,UMR 6083, F-37200 Tours, France
关键词
Polynomial differential system; limit cycle; Dulac function; DULAC FUNCTION; FORM;
D O I
10.3934/dcds.2010.27.217
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
We give an effective method for controlling the maximum number of limit cycles of some planar polynomial systems. It is based on a suitable choice of a Dulac function and the application of the well-known Bendixson-Dulac Criterion for multiple connected regions. The key point is a new approach to control the sign of the functions involved in the criterion. The method is applied to several examples.
引用
收藏
页码:217 / 229
页数:13
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