부분공간

$\left( \begin{array}{rrr} 1 & -2 & 3 \\ 0 & 5 & -1 \end{array} \right)^{t} = \left( \begin{array}{rrr} 1 & 0 \\ -2 & 5 \\ 3 & -1 \end{array} \right), \left( \begin{array}{rr} 1 & 2 \\ 2 & 3 \end{array} \right)^{t} = \left( \begin{array}{rr} 1 & 2 \\ 2 & 3 \end{array} \right)$