A NOTE ON QUASI-PERIODIC PERTURBATIONS OF ELLIPTIC EQUILIBRIUM POINTS

Houyu Zhao
2012 Bulletin of the Korean Mathematical Society  
The systeṁ where A is elliptic whose eigenvalues are not necessarily simple and h is O(x 2 ). It is proved that, under suitable hypothesis of analyticity, for most values of the frequencies, the system is reducible.
doi:10.4134/bkms.2012.49.6.1223 fatcat:mnmt2qjpyfhaxhjblvk5z4665y