Ordered Basis Problem

**skamoni** · March 31st 2011, 01:54 PM

Let $V$ be a 3-D space over a field $k$ with basis $B = (v_1,v_2,v_3)$ and consider linear operators $x,y,z:V\rightarrow V$ whose matrices relative to $B$ are:

$X=\left(\begin{array}{ccc}0&1&0\\0&0&0\\0&1&0\end{ array}\right), Y=\left(\begin{array}{ccc}0&2&0\\1&0&-1\\0&2&0\end{array}\right), Z=\left(\begin{array}{ccc}1&0&-1\\0&0&0\\1&0&-1\end{array}\right)$

Find vectors $u_1,u_2,u_3\inV$ such that

$x(u_1)=y(u_1)=z(u_1)=0$
$x(u_2),y(u_2),z(u_2)\in \ V_1=ku_1$ with $u_2\notin \ V_1$
$x(u_3),y(u_3),z(u_3)\in \ V_2=ku_1\oplus \ ku_2$ with $u_3\notin V_2$

I have been asked to find these vectors so that the matrices of $x,y,z$ with respect to $u_1,u_2,u_3$ are stricly upper triangular.

My inital procedure was to first find a common eigenvector for $x,y,z$ and take that as $u_1$ , but I couldn't find a common eigenvector that worked, when I calculated $u_2, u_3$ , the respective matrices for $x,y,z$ were not stricly upper triangular. I then tried $u_1=\left(\begin{array}{c}1\\0\\1\end{array}\right )$ but that didn't work. Any help would greatly appreciated.

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