Latex：使用 Tikz 更改节点名称

Question

请问，我该如何更改节点名称？我想将节点从 a、b、c、d、e 更改为 v1、v2、v3、v4 和 v5（请注意，V 旁边的数字必须是下标）。这是我的 latex Tikz

\documentclass[10pt]{amsart}
\usepackage[english]{babel}
\usepackage{tikz}
 \usetikzlibrary{arrows,shapes}


 \begin{document}


\begin{figure}[!htb]
    \centering
 \begin{tikzpicture}[>=stealth',shorten >=1pt,auto,node distance=2.5cm,
            thick,main node/.style={circle,draw,font=\sffamily\Large\bfseries}]

  \node[main node] (a) {a};
  \node[main node] (b) [below left of=a] {b};
  \node[main node] (c) [below right of=a] {c};
   \node[main node] (d)  [below of=b]{d};
   \node[main node] (e)  [below of=c]{e};

  \path
(a) [-]edge [loop above] node {} (a)
     [-]edge node[below] {} (b)
     [->]edge node [below]{} (c)
    [->] edge node [right]{} (d)
    [-] edge node [right]{} (e)

(b)    [-]edge [loop left] node {} (b)
       [-]edge node[below] {} (a)
        [->] edge node [right]{} (c)
        [-] edge node [right]{} (d)

(c) [-]edge [loop right] node {} (c)

(d) [-]edge [loop below] node {} (d)
    [->]edge node[below] {} (c)
    [-]edge node[right] {} (b)

(e) [-]edge [loop below] node {} (e)
    [-]edge node[below] {} (a)
    [->]edge node[right] {} (b)
    [->]edge node[below] {} (c)
    [->] edge node [right]{} (d);
\end{tikzpicture}
  \end{figure}

 \end{document}

谢谢

Answer 1

只需改为\node[main node] (a) {a};等等\node[main node] (a) {$v_1$};即可。