[tex]\left(\begin{array}{ccc}-1&0\\1&2\\\end{array}\right) \times \left(\begin{array}{ccc}0&1\\-1&2\\\end{array}\right)=\left(\begin{array}{ccc}0&-1\\-2&5\\\end{array}\right)\\\\\left(\begin{array}{ccc}0&1\\-1&2\\\end{array}\right)\times \left(\begin{array}{ccc}-1&0\\1&2\\\end{array}\right) =\left(\begin{array}{ccc}1&2\\3&4\\\end{array}\right)[/tex]
AB≠BA
deci Fals
