\mml 1

$x$

332CC365A4987AACCE0EAD01B8BDCC0B

$x$

\mml 2

$x^{2} \geq 0$

1D298051244A67121717C47AA4459658

$x^2\ge 0$

\mml 3

\begin {equation*}\begin {pmatrix}0&1\\1&0\end {pmatrix} \begin {pmatrix}a&b\\c&d\end {pmatrix} = \begin {pmatrix}c&d\\a&b\end {pmatrix}\end {equation*}

D42165DF2B9CFE792932E789E4E0F7BD

$$\left(\begin{array}{cc}0& 1\\ 1& 0\end{array}\right)\left(\begin{array}{cc}a& b\\ c& d\end{array}\right)=\left(\begin{array}{cc}c& d\\ a& b\end{array}\right)$$