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I tried to draw this in latex.

enter image description here

But not successful. How could I draw this quiver in latex? Thank you very much.

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Two solutions: one based on pstricks, the other on tikz-cd. For the pstricks solution, you can compile with pdflatex if you launch it with option --enable-write18 (MiKTeX) or -shell-escape (TeX Live, MacTeX). Alternatively, you can compile with xelatex:

\documentclass{article}
\usepackage{fourier}
\usepackage{pst-node, auto-pst-pdf}
\usepackage{tikz-cd}

\begin{document}

$ \psset{arrows=->, arrowinset=0.15, nodesep=4pt,  colsep=0.8cm,  rowsep=0.9cm,  linewidth=0.5pt, linejoin=1}
\begin{psmatrix}
  %%% nodes
  & β& & α\\
  b &  & a &  & c
  %%%arrows
  \ncline{1,2}{2,1} \ncline{1,2}{2,3}%
  \ncline{2,3}{2,1}\ncline{2,3}{2,5}%
  \ncline{2,3}{1,4}\ncline{2,5}{1,4}
\end{psmatrix}
$

\vskip 1cm
%\tikzcdset{column sep/normal=0.5cm}
\begin{tikzcd}[column sep=0.5cm, row sep=0.7cm]
  & β\dlar \drar & & α\\
  b &  & a\arrow[ll]\urar\arrow[rr]&  & c \ular
\end{tikzcd}

\end{document} 

enter image description here

  • thank you very much. I put the codes \begin{align} \begin{tikzcd}[column sep=0.5cm, row sep=0.7cm] & \beta \dlar \drar & & \alpha \\ b & & a \arrow[ll] \urar \arrow[rr] & & c \ular \end{tikzcd} \end{align} But there is an error: missing $ inserted. I don't know why. I already use begin{align} – Jianrong Li Sep 3 '16 at 14:17
  • The reason is TikZ-pdf uses the ampersand sign in a non-standard way, and align also uses ampersands. A workaround consists in adding to the options of tikz-cd ampersand replacement=\&, and replace & with \& in the diagram. – Bernard Sep 3 '16 at 14:44
  • thank you very much. I wrote \usepackage[ampersand replacement=\&]{tikz-cd}. But there is an error: unknown option ampersand replacement=\& – Jianrong Li Sep 3 '16 at 16:15
  • Which version of tikz-cd and of pgf do you have? Present versions are 0.9e and 3.0.1 respectively. – Bernard Sep 3 '16 at 17:03
  • thank you very much. How to check the version of tikz-cd and pgf? – Jianrong Li Sep 3 '16 at 17:34
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it is elementary with Tikz, I think you need to try before asking a question. Here is a response

enter image description here

\documentclass{article}

\usepackage[latin1]{inputenc}              
\usepackage[T1]{fontenc}

\usepackage{tikz}

\usetikzlibrary{positioning,calc}

    \begin{document}

    \begin{tikzpicture}

    \node (a) at (0,0){a};

    \node[left=2cm of a] (b){b};

    \node[right=2cm of a] (c){c};

    \node[above right=1cm of a] (alpha){$\alpha$};

    \node[above left=1cm of a] (beta){$\beta$};

    \draw[->] (a) -- (b);
    \draw[->] (a) -- (c);
    \draw[->] (beta) -- (a);
    \draw[->] (beta) -- (b);

    \draw (a) -- (alpha);
    \draw (c) -- (alpha);

    \end{tikzpicture}

    \end{document}

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