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Focus-center problem of planar degenerate system

✍ Scribed by Yilei Tang; Weigu Li; Zhifen Zhang


Book ID
108178228
Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
271 KB
Volume
345
Category
Article
ISSN
0022-247X

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Our researches are concerned with a class of planar general equivariant system of nine degrees. By making two appropriate transformations of system and calculating focal values carefully, we obtain the conditions that the infinity and three elementary focuses 2 ) become four general centers at the