# A kind of bifurcation of limit cycle from nilpotent critical point

Research paper by Yirong Liu, Feng Li

Indexed on: 12 Jan '16Published on: 12 Jan '16Published in: Mathematics - Dynamical Systems

#### Abstract

In this paper, an interesting and new bifurcation phenomenon that limit cycles could be bifurcated from nilpotent node (focus) by changing its stability was investigated. It is different from lowing its multiplicity in order to get limit cycles. We prove that \$n^2+n-1\$ limit cycles could be bifurcated by this way for \$2n+1\$ degree system. Moreover, this upper bound could be reached. At last, we give two examples to show that \$N(3)=1\$ and \$N(5)=5\$.