<<< mml $\begin{array}{}\text{(2.1)}& E=m{c}^2\end{array}$ >>> native [ EArray [ AlignCenter ] [ [ [ EGrouped [ EIdentifier "E" , ESymbol Rel "=" , EGrouped [ EIdentifier "m" , ESymbol Ord "\8290" , ESuper (EIdentifier "c") (ENumber "2") ] ] ] ] ] ]