【摘要】 本文解决了一类五次系统赤道环的稳定性与极限环分枝问题，所得的结论与二次系统的若干结论形 成有趣的对比．更多还原

【Abstract】 The problems of stability and limit cycle bifurcation of the equator for a class of fifth systems are solved in this paper. Some results on quadratic systems and some results obtained in this paper show an interesting contrast.更多还原