The minimal vertex - covering problem of graph is a NP-complete problem of graph theory.
图的最小顶点覆盖问题是图论中的一个NP完全问题。
In Chapter two, the minimal energy graph for this kind of graphs in some cases is obtained.
在第二章里，得到了这类图的极小能量图。
In chapter two, the minimal energy graph for fully angular hexagonal chains is helical hexagonal chain.
在第二章中，得到了全角六角链的极小能量图是螺旋链。
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