the internal ones. For example in
(<A HREF="node3.html#1.2.2">2.6</A>), we have
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<!-- MATH
 \begin{equation}
\left( \begin{array}{c}
                         u_1 \\u_2
                        \end{array} \right) =
                 \left( \begin{array}{rrr}
                         1 &  1 &  -2 \\
                         1 &  0 &  -1
                        \end{array} \right)
                 \left( \begin{array}{c}
                         v_1 \\v_2\\v_3
                        \e