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| In graph theory, a cycle in a graph is a non-empty trail in which the only repeated vertices are the first and last vertices. A directed cycle in a directed graph is a non-empty directed trail in which the only repeated vertices are the first and last vertices. | | In graph theory, a cycle in a graph is a non-empty trail in which the only repeated vertices are the first and last vertices. A directed cycle in a directed graph is a non-empty directed trail in which the only repeated vertices are the first and last vertices. |
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− | 在图论中,一个图中的'''<font color="#ff8000"> 环Cycle</font>'''是一个非空轨迹,其中唯一重复的点是起始点和最终点。如果是一个有向图的'''<font color="#ff8000"> 有向环Directed cycle</font>''',它同样是非空有向迹线,其中唯一重复的点也是起始点和最终点。 | + | 在图论中,一个图中的'''<font color="#ff8000"> 环Cycle</font>'''是一个非空轨迹,其中唯一重复的点是起点和终点。一个有向图中的'''<font color="#ff8000"> 有向环Directed cycle</font>'''同样是非空有向迹线,其中唯一重复的点也是起点和终点。 |
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| A graph without cycles is called an acyclic graph. A directed graph without directed cycles is called a directed acyclic graph. A connected graph without cycles is called a tree. | | A graph without cycles is called an acyclic graph. A directed graph without directed cycles is called a directed acyclic graph. A connected graph without cycles is called a tree. |
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− | 不带有环的图称为'''<font color="#ff8000"> 无环图Acyclic graph</font>'''。不带有有向环的有向图称为'''<font color="#ff8000"> 有向无环图Directed acyclic graph</font>'''。没有环的连接图称为'''<font color="#ff8000"> 树Tree</font>'''。
| + | 没有环的图称为'''<font color="#ff8000"> 无环图Acyclic graph</font>'''。没有有向环的有向图称为'''<font color="#ff8000"> 有向无环图Directed acyclic graph</font>'''。没有环的连接图称为'''<font color="#ff8000"> 树Tree</font>'''。 |
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| *The '''length''' of a circuit or cycle is the number of edges involved. | | *The '''length''' of a circuit or cycle is the number of edges involved. |
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− | * '''<font color="#ff8000"> 回路Circuit</font>'''是一条非空路径,其中第一个和最后一个顶点重复。设图''G =(V,E,ϕ)'',那么回路是具有顶点序列(''v1,v2,...,vn,v1'')的非空路径(''e1,e2,…,en'')。 | + | * '''<font color="#ff8000"> 回路Circuit</font>'''是一条非空路径,其中第一个和最后一个顶点重合。设图''G =(V,E,ϕ)'',那么回路是具有顶点序列(''v1,v2,...,vn,v1'')的非空路径(''e1,e2,…,en'')。 |
− | * 在一个环或简单回路中,唯一重复的顶点是起始点和最终点。 | + | * 在一个环或简单回路中,唯一重复的顶点是起点和终点。 |
− | * 一个回路或环的长度指的是相关连边的数量。 | + | * 一个回路(或环)的长度指的是相关连边的数量。 |
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| * A '''directed cycle''' or '''simple directed circuit''' is a directed circuit in which the only repeated vertices are the first and last vertices.{{sfn|Bender|Williamson|2010|p=164}} | | * A '''directed cycle''' or '''simple directed circuit''' is a directed circuit in which the only repeated vertices are the first and last vertices.{{sfn|Bender|Williamson|2010|p=164}} |
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− | * 有向回路是一个非空有向路径,其中第一个和最后一个顶点重复出现。设有向图''G =(V,E,ϕ)'',其有向回路是具有顶点序列(''v1,v2,...,vn,v1'')的非空有向路径(''e1,e2,……,en'')。 | + | * 有向回路是一个非空有向路径,其中第一个和最后一个顶点重合出现。设有向图''G =(V,E,ϕ)'',其有向回路是具有顶点序列(''v1,v2,...,vn,v1'')的非空有向路径(''e1,e2,……,en'')。 |
− | * 在一个有向环或简单有向回路中,唯一重复的顶点是起始点和最终点 | + | * 在一个有向环或简单有向回路中,唯一重复的顶点是起点和终点 |
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