In this paper, we show that under the condition that the minimum degree is at least 3, the iterated line digraph of a super-arc-connected digraph is super-connected.
本文证明了，在最小度至少为3的前提下超弧连通有向图的迭代线图是超点连通的。
The pipe connector of the invention adopts the opening annular outer case with the structure connected by two arc-shaped case body hinges, and can be conveniently opened and closed.
本发明的管接头采用由两个弧形壳体铰链连接结构的开口环形外壳，打开、合拢极为方便。
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