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Summary edit

Produced by TeX and XY-Pic using the source code shown below. Both the image and the source code are in the public domain.

% Produce a postscript file from this input with tex and dvips.

% Loading the XY-Pic package:
\input xy
\xyoption{all}

% Using postscript driver for smoother curves
\xyoption{ps}
\xyoption{dvips}

% No need for page numbers
\nopagenumbers

$$
\xymatrix @=3pt@! { %We want equal spacing, and the entries close together
&&0\ar[dr]&&0&&0\ar[dr]&&0&&0\ar[dr]&&0\\
&&&C_2\ar[ur]\ar[dr]&&&&C_4\ar[ur]\ar[dr]&&&&C_6\ar[ur]\ar[dr]\\
&&A_1\ar[rr]\ar[ur]&&A_2\ar[rr]\ar[dr]&&A_3\ar[rr]\ar[ur]&&A_4\ar[rr]\ar[dr]&&A_5\ar[ur]\ar[rr]&&A_6\ar[dr]\\
&C_1\ar[ur]&&&&C_3\ar[ur]\ar[dr]&&&&C_5\ar[ur]\ar[dr]&&&&C_7\ar[dr]\\
0\ar[ur]&&&&0\ar[ur]&&0&&0\ar[ur]&&0&&&&0
}
$$

\end

Licensing edit

This work has been released into the public domain by its author, AxelBoldt at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: AxelBoldt grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse

Original upload log edit

Transferred from en.wikipedia to Commons using FtCG.