Kite'sthoughts on twin squares: Difference between revisions
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com \\ | com \\ | ||
\end{array} | \end{array} | ||
\left[ \begin{array} { | \left[ \begin{array} {cc|c} | ||
1 & 0 & 0 \\ | 1 & 0 & 0 \\ | ||
-1 & 1 & 0 \\ | -1 & 1 & 0 \\ | ||