关于平面多项式系统的闭轨的凸性

The Convexity of Closed Orbit about Planar Polynomial System

在一些实际工作中，例如齿轮的设计，常需要考虑平面多项式系统确定的闭曲线的凸性．现对次数不高于三次的平面多项式系统的闭轨的凸性进行了讨论，并得到一些结论．

In practical work, such as the design of gear. we usually have to consider the convexity of closed orbit determined by planar polynomial system. In this paper. We discuss the convexity of planar polynomial systems whose degrees are not higher than three, and get some conclusions.