real plane;
algebraic curves;
Hilbert's 16th problem;
D O I:
10.1023/A:1013171019668
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
For each non-singular real algebraic curve f = 0 of degree m we exhibit an explicit vector field of degree m which has precisely the bounded components of f = 0 as limit cycles. The degree of the system is optimal for a generic class of algebraic curves and improves the significantly the bounds given by Winkel.