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1 IntroductionIn [1]-[31, the Berlinskii's theorem of the distribution of critical pointsfor quadratic differential systems is extended to the general n--th differentialsystems with nZ finite critical points. For cubic systems with 9 critical pointswhich must be all elementary, i.e., saddles or antisaddles, there are possiblysix kinds of distributions of critical points, such as 6 -- 3, 5 -- 4, 5 -- 3 1, 4 4 1, 4 -- 3 2 and 3 -- 3 3. For example, "5 -- 3 1" means that 5 outmostcriti… 相似文献
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