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== Example 5. ==
Let <math>\mathbf {A}_0= \left[ \begin{array}{rrrr} 1 & 1 \\ 1 & -1\\ \end{array} \right],</math> and <math>\mathbf {A}_1= \left[ \begin{array}{rrrr} a & -a \\ -1/a & -1/a\\ \end{array} \right],</math>, then the matrix <math>[\mathbf {A}]_N</math> is given by
:<math>
[\mathbf {A}]_4= \left[ \begin{array}{rrrr} 1 & 1 & a & -a \\ 1 & -1 & -1/a & -1/a \\ a & -a & 1 & 1 \\ -1/a & -1/a & 1 & -1 \\ \end{array} \right],</math>
when N=2p and p=2.
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