摘要In this paper, the following polynomial system is discussed: dx/dt=y[1+B(x)],dy/dt=(-x^α+δy+α1x^2α+α2x^αy+a5x^2αy)A(1+C(x)].And the necessary and sufficient conditions of existence and uniqueness of limit cycles are obtained.
4YE YANQIAN (Departmellt of Mathematics, Naming University, Naming 210008, China.).ANTI-SADDLES OF A POLYNOMIAL SYSTEM[J].Chinese Annals of Mathematics,Series B,1995,16(4):453-458.
