# Matrix Span

A= $\left(\begin{array}{cc}1 & 0\\0 & 0 \end{array}\right)$
B = $\left(\begin{array}{cc}0 & 0\\0 & 1 \end{array}\right)$
C = $\left(\begin{array}{cc}0 & 1\\1 & 0 \end{array}\right)$