图的可收缩边与可去边是研究连通图的构造和使用归纳法证明连通图的一些性质的有力工具。
Contractible edges and removable edges in connected graphs are a powerful tool to study the structures of connected graphs and to prove some properties of connected graphs by induction.
论文用两种方法给出了广义超立方体网络宽直径的具体证明，而两种方法的主要区别在于分别采用数学归纳法和直接构造法证明了不等式(1)。
In this paper, the wide-diameter of generalized hypercube is proved in two ways whose difference is to use mathematical induction and constructing method to prove the inequation (1).
针对微分中值问题的结论的不同特征，本文归纳出了辅助函数的四种构造方法。
According to different features of conclusion about middle value questions in differential calculus, four kinds of methods about the auxiliary function structures will be concluded.
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