| 1. | Polyhedra with seven vertices are rare .
具有七个顶点的多面体是稀少的。
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| 2. | A vertex with zero outdegree is called a sink .
出度为零的顶点称作收点。
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| 3. | Adjoin two new vertices x and y to n .
在N中添加两个新顶点X和Y。
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| 4. | Let u and v be nonconsecutive vertices on c .
设u和v是c上不相邻的两个顶点。
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| 5. | The component we collapsed had at least two vertices .
我们毁掉的分支至少有两个顶点。
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| 6. | Let us label each vertex with a 4 or 3 accordingly .
我们给每一个顶点相应地标上4或3。
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| 7. | Vertex a is the initial vertex and b is the terminal vertex .
A顶点是始端顶点，而b是末端顶点。
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| 8. | The condensation of d is a directed graph with m vertices .
D的凝聚图是指一个有m个顶点的有向图。
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| 9. | A star is defined as the set of edges incident to a vertex .
一个星形定义为关联于某个顶点的边的集合。
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| 10. | Up to isomorphism, there is just one complete graph on vertices .
在同构意义下，几个顶点的完全图只有一个。
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