本文首先研究了一类积集上的广义向量拟类变分不等式问题，使用不动点定理给出了它的解的存在性结果。

In this thesis, first, we employ the fixed point theorem to establish the existence of solution of a class of generalized vector quasi-variational-like inequality over product sets.

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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.

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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.

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