In the set of limit cycles of a polynomial vector field X = (P, Q) in the plane two equivalence relations are defined. Their classes of equivalence introduce the notions of fan and nest of limit cycles. By using them we obtain information about the configurations of limit cycles of X taking into account the degrees of the polynomials P and Q. © 1989.
|Journal||Journal of Differential Equations|
|Publication status||Published - 1 Jan 1989|