tikz 树中的错误数学分隔符

Question

我正在尝试使用 TikZ 树绘制一个扩展形式游戏的图表。以下代码在编译时生成错误。具体来说，它抱怨缺少$'s 和错误的数学分隔符。我仔细检查了括号，但找不到错误产生的位置。

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{trees}
\begin{document}
   \begin{tikzpicture}[%
   %%% Styles
   player/.style={draw,circle},
   level 2/.style={sibling distance=10mm}
   %every node/.style={node distance=1cm}
   ]
   %%% Nodes
   \node [player] (root) {1}
     child { node [player] (2a) {2} 
       child { node (aa) {
         \[ \begin{array}{c}
           1 \\ 2
         \end{array} \]} 
         edge from parent
         node [left] {A} 
       }
       child { node (ab) {
         \[ \begin{array}{c}
           3 \\ 4
         \end{array} \]}
         edge from parent
         node [right] {B}
       }
       edge from parent
       node [left] {A}
     }
     child { node [player] (2b) {2}
       child { node (ba) {
         \[ \begin{array}{c}
           5 \\ 6
         \end{array} \]} 
         edge from parent
         node [left] {A} 
       }
       child { node (bb) {
         \[ \begin{array}{c}
           7 \\ 8
         \end{array} \]} 
         edge from parent
         node [right] {B}
       } 
       edge from parent
       node [right] {B}
     };
   \end{tikzpicture}
\end{document}

相关错误日志输出如下

! Missing $ inserted.
<inserted text>
$
l.48 };
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Missing $ inserted.
<inserted text>
$
l.48 };
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! LaTeX Error: Bad math environment delimiter.

有人能解释一下是什么导致了这些错误吗？通常这不会是个问题，但我习惯rubber从 进行编译org-mode，而这些错误使它出错了。（texi2dvi对于那些感兴趣的人来说，这些错误也会出错。）

Answer 1

使用$...$而不是\[ ... \]就可以编译。

即使通过 完成$$ ... $$，显示的数学运算也无法直接在 TikZ 树节点中起作用。您可能不需要它。至于字体大小，您可以\displaystyle在必要时使用。