摘要
Some sharp sufficient conditions for generalized Lienard systems to have positive or negative semi-orbits which do not cross the vertical isocline are given. Applications of the main results to some polynomial systems are also presented.
Some sharp sufficient conditions for generalized Lienard systems to have positive or negative semi-orbits which do not cross the vertical isocline are given. Applications of the main results to some polynomial systems are also presented.
基金
theNationalNaturalScienceFoundationofChina ( 1 953 1 0 70 )
ShanghaiShuGuangProject( 1 998)
