<<< native [ EDelimited "[" "]" [ Right (EArray [ AlignCenter , AlignCenter ] [ [ [ EFraction DisplayFrac (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ]) (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ]) ] , [ EFraction DisplayFrac (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ]) (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "1") ]) ] ] , [ [ ESpace (2 % 9) ] ] , [ [ EFraction DisplayFrac (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "1") ]) (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ]) ] , [ EFraction DisplayFrac (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "x") (ENumber "2") ]) (EGrouped [ ESymbol Ord "\8706" , ESub (EIdentifier "y") (ENumber "2") ]) ] ] ]) ] , EDelimited "(" ")" [ Right (EArray [ AlignCenter , AlignCenter ] [ [ [ ENumber "1" ] , [ ENumber "2" ] ] , [ [ ENumber "3" ] , [ ENumber "4" ] ] ]) ] , EDelimited "{" "}" [ Right (EArray [ AlignCenter , AlignCenter ] [ [ [ ENumber "1" ] , [ ENumber "2" ] ] , [ [ ENumber "3" ] , [ ENumber "4" ] ] ]) ] , EDelimited "\8739" "\8739" [ Right (EArray [ AlignCenter , AlignCenter ] [ [ [ ENumber "1" ] , [ ENumber "2" ] ] , [ [ ENumber "3" ] , [ ENumber "4" ] ] ]) ] , EDelimited "\8741" "\8741" [ Right (EArray [ AlignCenter , AlignCenter ] [ [ [ ENumber "1" ] , [ ENumber "2" ] ] , [ [ ENumber "3" ] , [ ENumber "4" ] ] ]) ] ] >>> mml $$\left[\begin{array}{cc}\hfill \frac{\partial x_1}{\partial y_1}\hfill & \hfill \frac{\partial x_2}{\partial y_1}\hfill \\ \hfill \hfill \\ \hfill \frac{\partial x_1}{\partial y_2}\hfill & \hfill \frac{\partial x_2}{\partial y_2}\hfill \end{array}\right]\left(\begin{array}{cc}\hfill 1\hfill & \hfill 2\hfill \\ \hfill 3\hfill & \hfill 4\hfill \end{array}\right)\left\{\begin{array}{cc}\hfill 1\hfill & \hfill 2\hfill \\ \hfill 3\hfill & \hfill 4\hfill \end{array}\right\}\mid \begin{array}{cc}\hfill 1\hfill & \hfill 2\hfill \\ \hfill 3\hfill & \hfill 4\hfill \end{array}\mid \parallel \begin{array}{cc}\hfill 1\hfill & \hfill 2\hfill \\ \hfill 3\hfill & \hfill 4\hfill \end{array}\parallel$$