Reflect And Transform
Geometry
Level
4
\[A=\frac{1}{9}\begin{bmatrix}-1 & 8 &4\\8 & -1 & 4\\4 & 4 & -7\end{bmatrix}\]
What kind of a transformation of \(\mathbb{R}^3\) does \(A\) represent?
by
Otto Bretscher