研究了一类拟解析系统的中心条件与等时中心条件。
The center conditions and isochronous center conditions for a class of quasi - analytic systems were investigated.
研究了一类拟解析系统的中心条件与等时中心条件。
The center conditions and isochronous center conditions for a class of quasi-analytic systems were investigated.
运用拟齐次函数的性质，给出了一类解析函数正规型的一个简单的初等的证明方法。
The normal form of a kind of analysis function is proved with a simple and elementary method by using the properties of semiquasihomogeneous functions.
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