- #1
TomAlso
- 5
- 0
Homework Statement
Think of the following matrix
[itex]
A =
\left( \begin{array}{ccc}
a & b & c \\
d & e & f \\
g & h & i \end{array} \right)
[/itex]
as a transformatiom of [itex]\mathbb{R}^3[/itex] onto itself. Describe [itex]A[/itex] as a projection onto a plane followed by a shearing motion of the plane.
2. The attempt at a solution
So the problem basically asks to rewrite [itex]A[/itex] as a product [itex]A = BC[/itex] where [itex]B[/itex] and [itex]C[/itex] are 3-by-3 matrices, [itex]B[/itex] representing a projection onto a plane and [itex]C[/itex] representing a shearing of such plane.
Since [itex]B[/itex] is a projection it must be that [itex]B = B^2[/itex] and that is pretty much all I know. I can't seem to find precise definition of shearing as a transformation. What can we say about [itex]C[/itex]. How do we proceed after that?
Any help is greatly appreciated :D