Solución al ejercicio 7017

Son base: - \left\{ \left( \begin{array}{cc} 1 & 0 \\ 1 & -1 \end{array} \right),\left( \begin{array}{cc} 1 & 1 \\ 0 & 0 \end{array} \right),\left( \begin{array}{cc} 1 & 0 \\ -1 & 0 \end{array} \right),\left( \begin{array}{cc} 1 & 1 \\ 0 & 1 \end{array} \right)\right\} - \left\{\left( \begin{array}{cc} -1 & 0 \\ 0 & -1 \end{array} \right),\left( \begin{array}{cc} 1 & 1 \\ 1 & 0 \end{array} \right),\left( \begin{array}{cc} 1 & 1 \\ 0 & 1 \end{array} \right),\left( \begin{array}{cc} 1 & 0 \\ -1 & 1 \end{array} \right)\right\}