一类具有不少于“3/8n^2”族极限环的平面n次系统  

A Class of Planar n-polynomial System with at Least [3/8n^2] Family Limit Cycles

作　　者：白敬新 

机构地区：[1]川南林业局东风木材厂,四川峨边614300

出　　处：《数学学报（中文版）》2000年第2期245-252,共8页Acta Mathematica Sinica：Chinese Series

摘　　要：本文给出结果：（１）一类具有不少于［3/8n^2］个一阶细焦点的平面ｎ次系统．（２）一类具有不少于［３/8n^2］族权限环的平面ｎ次系统．In this paper, we give the following results: (1) A class of planar n-polynomial system with at least [n2] weak focus of order 1. (2) A class of planar n-polynomial system with at least [n2] family limit cycles.

关 键 词：细焦点 极限环 N次系统 平面系统 

分 类 号：O175.12[理学—数学]