A sufficient condition is given in order that a centre of a polynomial planar autonomous system be a global centre.
Per il sistema autonomo differenziale del testo si danno condizióni sufficienti affinché l'origine. sia un centro globale.
@article{RLIN_1991_9_2_4_281_0,
author = {Marco Sabatini},
title = {A sufficient condition for a polynomial centre to be global},
journal = {Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni},
volume = {2},
year = {1991},
pages = {281-285},
zbl = {0757.34025},
mrnumber = {1152634},
language = {en},
url = {http://dml.mathdoc.fr/item/RLIN_1991_9_2_4_281_0}
}
Sabatini, Marco. A sufficient condition for a polynomial centre to be global. Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni, Tome 2 (1991) pp. 281-285. http://gdmltest.u-ga.fr/item/RLIN_1991_9_2_4_281_0/
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