本文研究与网络题有关的一些极图，得出的主要结果有：五个关于没有三角形的极大图的定理，以及它们的三个推论。

In this. paper, some extreme graphs relative to network problems are studied. The main results include five theorems on maximum graphs without triangles and their three corollaries.

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然而，目前国内外对这一课题的研究还不尽人意，特别是国内还缺少对基于因特网的网络学习行为的全面、系统、细致的研究。

However, the domestic and international study on this subject is still less than satisfactory at present, especially still lack systematically, carefully research on E-learning behavior at home.

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