2 What are involutary matrix

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$I f A \times A i . e ., A^{2} = I T h e n A i s s a i d t o b e i n v o l u t a r y m a t r i x$

A

A = ⎡ ⎢ ⎣ \begin{matrix} 0 & 1 & - 1 4 & - 3 & 4 3 & - 3 & 4 \end{matrix} ⎤ ⎥ ⎦

A / 2

$A = [\begin{matrix} 0 & 1 1 & 0 \end{matrix}] is an involutary matrix.$

If A is involutary then $| A | = 1 o r - 1$

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