TY - JOUR
T1 - Centers for the Kukles homogeneous systems with odd degree
AU - Giné, Jaume
AU - Llibre, Jaume
AU - Valls, Claudia
PY - 2015/1/1
Y1 - 2015/1/1
N2 - © 2015 London Mathematical Society. For the polynomial differential system x=-y, y=x +Qn(x,y), where Qn(x,y) is a homogeneous polynomial of degree n there are the following two conjectures raised in 1999. (1) Is it true that the previous system for n ≥ 2 has a center at the origin if and only if its vector field is symmetric about one of the coordinate axes? (2) Is it true that the origin is an isochronous center of the previous system with the exception of the linear center only if the system has even degree? We prove both conjectures for all n odd.
AB - © 2015 London Mathematical Society. For the polynomial differential system x=-y, y=x +Qn(x,y), where Qn(x,y) is a homogeneous polynomial of degree n there are the following two conjectures raised in 1999. (1) Is it true that the previous system for n ≥ 2 has a center at the origin if and only if its vector field is symmetric about one of the coordinate axes? (2) Is it true that the origin is an isochronous center of the previous system with the exception of the linear center only if the system has even degree? We prove both conjectures for all n odd.
U2 - https://doi.org/10.1112/blms/bdv005
DO - https://doi.org/10.1112/blms/bdv005
M3 - Article
SN - 0024-6093
VL - 47
SP - 315
EP - 324
JO - Bulletin of the London Mathematical Society
JF - Bulletin of the London Mathematical Society
IS - 2
ER -