Vertex labeling emptyset

Question

I want to draw a tree which contains nodes that are from 2 or more paarents is there any way to set this up with tikz and trees

\documentclass{scrartcl}

% input encoding
\usepackage[utf8]{inputenc}

% new german spelling
\usepackage[ngerman]{babel}

% choose font
\usepackage[T1]{fontenc}
\usepackage{lmodern}

% KOMA-Script options
\KOMAoptions{%
  parskip=full,%
  fontsize=12pt,%
  DIV=calc}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes.geometric}
\tikzset{
  level/.style={
    sibling distance=20mm/#1
  },
  level distance=10mm,
}
\usepackage{tkz-graph}
\begin{document}

\begin{tikzpicture}
\GraphInit[vstyle=Empty]
\Vertex{$\emptyset$}
\Vertex[x=2,y=0]{Q}
\Vertex[x=1,y=-2]{X}
\Vertex[x=-1,y=-2]{Z}
\Vertex[x=3,y=-2]{R}
\Vertex[x=0,y=-3]{A}
\Vertex[x=2,y=-3]{B}
\Vertex[x=-1,y=-4]{C}
\Vertex[x=1,y=-4]{D}
\Vertex[x=3,y=-4]{E}
\Edges(Z,X,Q,R) 
\Edges(A,X,B)
\Edges(C,A,D,B,E)
\end{tikzpicture}
\end{document}

Such things are called multi dominant trees, and the answer is yes: https://tex.stackexchange.com/a/511136. — , Dec 13 '19 at 17:40
Since these aren't really trees, there are no out of the box methods. See Multi-rooted Tree-like Structures and Nodes with Multiple Parents in LaTeX How to get limited multidominance in a forest tree. — Alan Munn, Dec 13 '19 at 17:40
You got two links that show you how to start. If you want to get an explicit answer, please consider providing us with an explicit code that illustrates what you have tried, and where you got stuck. — , Dec 13 '19 at 18:00
Actually using \vertex could you tell me how i could name a node with \emptyset? That's my only issue for that one — Rack Cloud, Dec 13 '19 at 18:24

score 5 · Accepted Answer · answered Dec 13 '19 at 18:50

In order to give the vertex a displayed name that differs from its identifier, use the L key. See section 5 of the tkz-graph manual. (No, I do not speak French, but one can guess this from the examples.)

\documentclass{scrartcl}

% input encoding
\usepackage[utf8]{inputenc}

% new german spelling
\usepackage[ngerman]{babel}

% choose font
\usepackage[T1]{fontenc}
\usepackage{lmodern}

% KOMA-Script options
\KOMAoptions{%
  parskip=full,%
  fontsize=12pt,%
  DIV=calc}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes.geometric}
\tikzset{
  level/.style={
    sibling distance=20mm/#1
  },
  level distance=10mm,
}
\usepackage{tkz-graph}
\begin{document}

\begin{tikzpicture}
\GraphInit[vstyle=Empty]
\Vertex[L=$\emptyset$]{Y}
\Vertex[x=2,y=0]{Q}
\Vertex[x=1,y=-2]{X}
\Vertex[x=-1,y=-2]{Z}
\Vertex[x=3,y=-2]{R}
\Vertex[x=0,y=-3]{A}
\Vertex[x=2,y=-3]{B}
\Vertex[x=-1,y=-4]{C}
\Vertex[x=1,y=-4]{D}
\Vertex[x=3,y=-4]{E}
\Edges(Z,Y,X,Q,R) 
\Edges(A,X,B)
\Edges(C,A,D,B,E)
\end{tikzpicture}
\end{document}

Vertex labeling emptyset

1 Answers1