如何减少分支和 cdot 之间的距离

Question

我按节点/子节点创建一棵树，如下所示：

\begin{tikzpicture}
    \tikzstyle{nodestyle} = [circle,draw,minimum size=5pt]

    \node [nodestyle, inner sep=0pt] {$\{X\}|_{\aleph_0}$}
    child {node {$\vdots$}
        child {node [nodestyle, inner sep=4pt] (a) {$X$}}
    }; 
    \path (0,0.7) node[above] {$X,X_1,X_2\in\mathcal{E}$};

    \begin{scope}[xshift=2.7cm]
    \node [nodestyle, inner sep=0pt] {$\{S\}|_{\aleph_0}$}
    child {node {$\vdots$}
        child {node [nodestyle, inner sep=3pt] (a) {$S$}
                child {node [nodestyle,inner sep=0pt] {$\{X_1\}$}
                    child {node [nodestyle, inner sep=1pt] {$X_1$}}
                }
                child {node [nodestyle,inner sep=1pt] (e) {$X_2$}}          
        }
    }; 

    \path (0,0.7) node[above] {$S=\{\{X_1\},X_2\}$};
    \end{scope}
\end{tikzpicture}

我想将 cdots 上方分支的距离设置为与 cdots 下方分支的距离相同。谢谢。

Answer 1

如果您确实想为此使用节点，您可能需要查看此代码片段。 （我还将 tikzstyle 更新为 tikzset。）

更新：你说得对。我实际上从未意识到点状并不真正产生点。

第二次更新：我希望我正确理解了您的请求。现在点从 1mm 以下开始。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.shapes,calc}
\begin{document}
% from https://tex.stackexchange.com/a/52849/121799
\tikzset{decorate sep/.style 2 args=
{decorate,decoration={shape backgrounds,shape=circle,shape size=#1,shape sep=#2}}}

\begin{tikzpicture}
    \tikzset{nodestyle/.style={circle,draw,minimum size=5pt}} % changed

    \node [nodestyle, inner sep=0pt] {$\{X\}|_{\aleph_0}$}
    child {node[minimum size=1cm] (dummy1) {}
        child {node [nodestyle, inner sep=4pt] (a) {$X$}}
    }; 
    \draw[decorate sep={0.4mm}{2mm},fill] ($(dummy1.north)-(0,1mm)$) -- (dummy1.south);
    \path (0,0.7) node[above] {$X,X_1,X_2\in\mathcal{E}$};

    \begin{scope}[xshift=2.7cm]
    \node [nodestyle, inner sep=0pt] {$\{S\}|_{\aleph_0}$}
    child {node[minimum size=1cm] (dummy2) {}
        child {node [nodestyle, inner sep=3pt] (a) {$S$}
                child {node [nodestyle,inner sep=0pt] {$\{X_1\}$}
                    child {node [nodestyle, inner sep=1pt] {$X_1$}}
                }
                child {node [nodestyle,inner sep=1pt] (e) {$X_2$}}          
        }
    }; 
    \draw[decorate sep={0.4mm}{2mm},fill] ($(dummy2.north)-(0,1mm)$) -- (dummy2.south);
    \path (0,0.7) node[above] {$S=\{\{X_1\},X_2\}$};
    \end{scope}
\end{tikzpicture}
\end{document}