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来自「浙江大学计算机学院数据结构课程的教学课件」· HTM 代码 · 共 40 行

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<b><font face="Arial, Helvetica, sans-serif" size="4" color="#FF0000">the depth first number</font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000">, or <i><font color="#0033CC">dfn</font></i>, of the vertex:
    the sequence in which the vertices are visited during the depth
     first search
<font color="#FF0000">□ </font>if u and v are both vertices, and u is an ancestor of v in the depth
     first spanning tree, then <font color="#0033CC"><i>dfn(u) < dfn (v)</i></font>

                           <img src="image/text6-q.gif" width="415" height="214">
<font color="#FF0000">□  </font>a nontree edge ( u, v ) is a <i><font color="#FF0000">back edge</font></i>
      iff  either u is an ancestor of v or v is an ancestor of u.
    <font color="#FF0000"> * all nontree edges are back edges.</font>
<font color="#FF0000">□ </font>the <font color="#FF0000">root</font> of a depth spanning tree is an articulation point 
     iff  it has at least two children<font face="Arial, Helvetica, sans-serif" size="4" color="#000000">.</font>
<font color="#FF0000">□ </font>any other vertex <font color="#FF0000">u </font> is an articulation  point 
     iff  it has at least one child<font color="#FF0000"> w</font><font face="Arial, Helvetica, sans-serif" size="4" color="#000000"> </font>such that we cannot reach an
     ancestor of u using a path that consists of only w, 
     descendants of w, and a single back edge.

</font></b></pre>
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