A SYSTEM OF DEGREE FOUR WITH AN INVARIANT TRIANGLE AND AT LEAST THREE SMALL AMPLITUDE LIMIT CYCLES

作者：Liu, Z H^*; Saez, E; Szanto, I

来源：Electronic Journal of Qualitative Theory of Differential Equations, 2010, (69): 1-7.

We show the existence of a polynomial system of degree four having three real invariant straight lines forming a triangle with at least three small amplitude limit cycles in the interior. Also, we obtain the necessary and sufficient conditions for the critical point at the interior of the bounded region to be a center.

• 出版日期2010
• 单位广西民族大学