## Bulletin of the Belgian Mathematical Society - Simon Stevin

### Limit cycles for a class of quintic $\mathbb{Z}_6$-equivariant systems without infinite critical points

#### Abstract

We analyze the dynamics of a class of $\mathbb{Z}_6$-equivariant systems of the form $\dot{z}=pz^2\bar{z}+sz^3\bar{z}^2-\bar{z}^{5},$ where $z$ is complex, the time $t$ is real, while $p$ and $s$ are complex parameters. This study is the natural continuation of a previous work (M.J. Àlvarez, A. Gasull, R. Prohens, Proc. Am. Math. Soc. \textbf{136}, (2008), 1035--1043) on the normal form of $\mathbb{Z}_4$-equivariant systems. Our study uses the reduction of the equation to an Abel one, and provide criteria for proving in some cases uniqueness and hyperbolicity of the limit cycle surrounding either 1, 7 or 13 critical points, the origin being always one of these points.

#### Article information

Source
Bull. Belg. Math. Soc. Simon Stevin Volume 21, Number 5 (2014), 841-857.

Dates
First available in Project Euclid: 1 January 2015

Àlvarez, M.J.; Labouriau, I.S.; Murza, A.C. Limit cycles for a class of quintic $\mathbb{Z}_6$-equivariant systems without infinite critical points. Bull. Belg. Math. Soc. Simon Stevin 21 (2014), no. 5, 841--857. https://projecteuclid.org/euclid.bbms/1420071857.