一类平面非线性系统无闭轨的充分条件

On the Sufficient Conditions of the Nonexistence of Periodic Solutions for a Planar Nonlinear System

中文关键词:  闭轨  正（负）半轨  平衡点

英文关键词:periodic solutions  positive and negative semitrajectory  critical point.

中文摘要:

      本文建立了一类平面非线性系统无闭轨的若干充分条件．

英文摘要:

      In the paper,some sufficient conditions are established for the nonexistence of peri- odic solutions of a nonlinear system.