<<< native
[ EText TextNormal "Here's a display\160"
, EGrouped
    [ EGrouped
        [ EIdentifier "F"
        , ESymbol Ord "\8289"
        , EDelimited
            "("
            ")"
            [ Right
                (EGrouped [ EIdentifier "t" , ESymbol Pun "," , EIdentifier "y" ])
            ]
        ]
    , ESymbol Rel "="
    , EFraction
        NormalFrac
        (EDelimited
           "("
           ")"
           [ Right
               (EGrouped
                  [ ENumber "1"
                  , ESymbol Pun ","
                  , EFraction
                      NormalFrac
                      (EGrouped [ ESymbol Ord "\8518" , EIdentifier "y" ])
                      (EGrouped [ ESymbol Ord "\8518" , EIdentifier "t" ])
                  ])
           ])
        (EDelimited
           ""
           ""
           [ Left "\8741"
           , Right
               (EDelimited
                  "("
                  ")"
                  [ Right
                      (EGrouped
                         [ ENumber "1"
                         , ESymbol Pun ","
                         , EFraction
                             NormalFrac
                             (EGrouped [ ESymbol Ord "\8518" , EIdentifier "y" ])
                             (EGrouped [ ESymbol Ord "\8518" , EIdentifier "t" ])
                         ])
                  ])
           , Left "\8741"
           ])
    ]
, EText TextNormal "\160with some real math in it."
]
>>> eqn
roman "Here's a display " {{F  left ( {t , y} right )} = {left ( {1 , {\[u2146] y} over {\[u2146] t}} right )} over {left "" "∥" left ( {1 , {\[u2146] y} over {\[u2146] t}} right ) "∥" right ""}} roman " with some real math in it."