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I create a tree by node/child as follows:

\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}

I want to set distance from branch above cdots to be same as that of below cdots. Thanks.

Eugene Zhang
  • 730

1 Answers1

1

If you really want to use nodes for this, you may want to have a look at this snippet. (I also updated tikzstyle to tikzset.)

UPDATE: You are right. I actually never realized that dotted does not really produce dots.

SECOND UPDATE: I hope I understand your request correctly. Now the dots start 1mm below.

\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}

enter image description here

  • Your code is good, but there are 2 problems. First is there way to change dot to round (currently is square)? Second can number of dots be reduced to 4 or 5? – Eugene Zhang Feb 02 '18 at 18:17
  • @MathWizard Sorry, I don't understand your first comment, but perhaps you are using a viewer that lets the dots appear as squares? (Just zoom in to check.) And for point 2: Very simple: either decrease in minimum size=1cm to 1cm to some smaller value and/or play with the line style, e.g. loosely dotted instead of dotted. –  Feb 02 '18 at 18:27
  • First question means that dots are square (I change line style to very thick and you can see when zoom), while dots in \cdots are circle. – Eugene Zhang Feb 02 '18 at 18:37
  • @MathWizard Apologies! You're right, please see my update. –  Feb 02 '18 at 18:50
  • @ marmot, thanks for the answer. Last question, is it possible for dot not to start at the end of branch of node? The reason is that I have other tree with more children that is connected by cdots, which I will not change to dummy variable. – Eugene Zhang Feb 02 '18 at 20:00
  • @MathWizard I hope that I understood your question correctly. Please see the update. –  Feb 02 '18 at 20:20