<<< mml $$V_m^n=\underset{\phantom{\text{d}}}{\overset{\phantom{\text{d}}}{V_m^n}}$$ >>> native [ ESubsup (EIdentifier "V") (EIdentifier "m") (EIdentifier "n") , ESymbol Rel "=" , EUnderover False (ESubsup (EIdentifier "V") (EIdentifier "m") (EIdentifier "n")) (EPhantom (EText TextNormal "d")) (EPhantom (EText TextNormal "d")) ]