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On quadratic differential system with a weak focus of 2 order
long yan 1; wang xuejin 2; huang chaoyan 3 (1.department of auditing; college of hubei finance and economics; wuhan 430077; china; 2.department of mathematics; beijing normal university; beijing 100085; china; 3.school of mathematics and computer science; hubei university; wuhan 430062; china)
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Some results on infinite soluble groups
liu heguo; zhang jiyu (1.school of mathematics and computer science; hubei university; wuhan 430062; china; 2.department of economic management; huaiyin engineering institute; huaian 223001; china)
..............page:283-286
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