Thread: G-sets to counting
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Old December 15th, 2008, 08:05 AM
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The edge rotation is a 180º rotation about a line joining the midpoints of diagonally opposite edges, such as the red line in this picture.

\setlength{\unitlength}{2mm}\begin{picture}(20,20)\put(2,2){\line(1,0){10}}\put(2,12){\line(1,0){10}}\put(7,5){\line(1,0){10}}\put(7,15){\line(1,0){10}}\put(2,2){\line(0,1){10}}\put(12,2){\line(0,1){10}}\put(7,5){\line(0,1){10}}\put(17,5){\line(0,1){10}}\put(2,2){\line(5,3){5}}\put(12,2){\line(5,3){5}}\put(2,12){\line(5,3){5}}\put(12,12){\line(5,3){5}}\put(2,7){\color{red}\line(5,1){15}}\end{picture}
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