planar polynomial differential systems
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2020 ◽  
Vol 30 (08) ◽  
pp. 2050115
Author(s):  
Jing Gao ◽  
Yulin Zhao

In this paper, we study a class of [Formula: see text]-equivariant planar polynomial differential systems [Formula: see text]. It is shown that for any [Formula: see text] there is a differential system of the above type having at least [Formula: see text] limit cycles. This is proved by estimating the number of zeros of the first-order Melnikov function.





2018 ◽  
Vol 30 (3) ◽  
pp. 1295-1310 ◽  
Author(s):  
Jaume Llibre ◽  
Rafael Ramírez ◽  
Valentín Ramírez ◽  
Natalia Sadovskaia




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