1

If somebody can help me to draw this to quivers. (1) A double infinity, (2) look at the image, it is also infinite Thanksenter image description here

8

The purpose of the site is to help you if you got stuck, not to convert screen shots to LaTeX code. There are many possibilities to draw this. Here is one.

\documentclass{article}
\usepackage{tikz-cd}
\begin{document}
\[\begin{tikzcd}
\bullet & & & \bullet & & & \bullet & & \\
 & \bullet\arrow[ul]\arrow[dl] & \arrow[l]\bullet\arrow[ur] & & 
 \arrow[ul]\arrow[dl]\bullet & \arrow[l]\bullet \arrow[ur]& 
 & \arrow[ul]\arrow[dl]\bullet &  \arrow[l]\cdots\\
\bullet & & & \arrow[ul]\bullet & & & \arrow[ul]\bullet & & \\
\end{tikzcd}\]
\end{document}

enter image description here

  • 2
    @DiegoHavez I don't understand your comment (and need to leave now). Two times infinity is still infinity, so a double infinity is the same as a single infinity. – marmot Jan 10 at 23:22
5

Here is a simple code with pstricks:

\documentclass{article}
\usepackage{amsmath, amssymb} 
\usepackage{pst-node}
\usepackage{auto-pst-pdf} 

\begin{document}

\[ \psset{arrows=->, arrowinset=0.12 , linewidth=0.6pt, colsep=1cm, rowsep=0.5cm, nodesep=2.5pt}
\begin{psmatrix}
\dotnode{R3} & & & \dotnode{R2} & & & \dotnode{R1} \\
 & \dotnode{F} & \dotnode{E} & & \dotnode{D} & \dotnode{C} & & \dotnode{B} & \rnode{A}{\boldsymbol{\dots\dots}}\\
%%%
\dotnode{S3} & & & \dotnode{S2} & & & \dotnode{S1} 
%% arrows
\foreach \s/\t in {A/B,C/D,E/F}{\ncline{\s}{\t}}
\foreach \s/\i in {B/1,D/2,F/3}{\ncline{\s}{R\i}\ncline{\s}{S\i}}
\foreach \s/\i in {C/1,E/2}{\ncline{\s}{R\i}\ncline{S\i}{\s}}
\end{psmatrix}
\]
\end{document} 

enter image description here

  • Thanks Bernard. And if you want to inverse the last right arrow? after that ending another arrow in the right and dots? how can I do it? – user178971 Jan 13 at 0:45
  • If I understand well what you're asking, you just have to swap the 1st and 2nd arguments of \ncline ("source" and "target"). – Bernard Jan 13 at 0:58
4

A solution with xy

\documentclass[border = 10pt]{standalone}

\usepackage[all]{xy}

\begin{document}

\xymatrix{
{\bullet} & & & {\bullet} & & & {\bullet} \\
& {\bullet}\ar[ul] \ar[dl] & {\bullet}\ar[l] \ar[ur] & & {\bullet} \ar[ul] \ar[dl] & {\bullet} \ar[l] \ar[ur]
& & {\bullet} \ar[ul] \ar[dl]  & {\cdots} \ar[l] \\
{\bullet} & & & {\bullet} \ar[ul] & & & {\bullet} \ar[ul]
}

\end{document}

enter image description here

  • 2
    Just to save typing: braces around bullet is not necessary. – Sigur Jan 11 at 1:17
  • @Sigur Thanks for your input, it definitely does .... just an old habit :) – caverac Jan 11 at 8:58
  • Caverac how can I inverse the last arrow in the right? – user178971 Jan 13 at 0:50
  • @DiegoHavez Change the line ... \ar[ul] \ar[dl] & {\cdots} \ar[l] to ... \ar[ul] \ar[dl] \ar[r] & {\cdots} – caverac Jan 13 at 0:53
  • Caverac thanks for the answer actually I want to add to arrows in the right direction after that dots. Can you help me please – user178971 Jan 13 at 0:57

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