Weak-Foci of High Order and Cyclicity
Weak-Foci of High Order and Cyclicity
复制标题
高阶循环弱焦点
DOI:
10.1007/s12346-016-0189-9
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发表时间:
2017-07
影响因子:
1.4
通讯作者:
Torregrosa Joan
中科院分区:
文献类型:
--
作者:
Liang Haihua;Torregrosa Joan
A particular version of the 16th Hilbert’s problem is to estimate the number,M(n), of limit cycles bifurcating from a singularity of center-focus type. This paper is devoted to finding lower bounds forM(n) for some concretenby studying the cyclicity of different weak-foci. Since a weak-focus with high order is the most current way to produce high cyclicity, we search for systems with the highest possible weak-focus order. For evenn, the studied polynomial system of degreenwas the one obtained by Qiu and Yang (J Differ Equ 246:3361–3379, 2009) where the highest weak-focus order isfor. Moreover, we provide a system which has a weak-focus with orderfor. We show that Christopher’s approach (Differ Equ Symb Comput Trends Math 30:23–35, 2006), aiming to study the cyclicity of centers, can be applied also to the weak-focus case. We also show by concrete examples that, in some families, this approach is so powerful and the cyclicity can be obtained in a simple computational way.
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影响因子:
2.4
作者:
Haihua Liang;Joan Torregrosa
通讯作者:
Haihua Liang;Joan Torregrosa
影响因子:
0.8
作者:
J. Llibre;Roland Rabanal
通讯作者:
J. Llibre;Roland Rabanal
DOI:
10.1016/j.amc.2012.02.044
发表时间:
2012-05
期刊:
Appl. Math. Comput.
影响因子:
--
作者:
J. Giné
通讯作者:
J. Giné
影响因子:
1.7
作者:
H. Zoladek
通讯作者:
H. Zoladek
DOI:
10.1007/bf03015693
发表时间:
--
期刊:
Rendiconti del Circolo Matematico di Palermo (1884-1940)
影响因子:
--
作者:
M. Poincaré
通讯作者:
M. Poincaré