<<< tex
   \nabla \cdot \vec{v} =
   \frac{\partial v_x}{\partial x} +
   \frac{\partial v_y}{\partial y} +
   \frac{\partial v_z}{\partial z}

>>> native
[ ESymbol Ord "\8711"
, ESymbol Bin "\8901"
, EOver False (EIdentifier "v") (ESymbol Accent "\8407")
, ESymbol Rel "="
, EFraction
    NormalFrac
    (EGrouped
       [ ESymbol Ord "\8706" , ESub (EIdentifier "v") (EIdentifier "x") ])
    (EGrouped [ ESymbol Ord "\8706" , EIdentifier "x" ])
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (EGrouped
       [ ESymbol Ord "\8706" , ESub (EIdentifier "v") (EIdentifier "y") ])
    (EGrouped [ ESymbol Ord "\8706" , EIdentifier "y" ])
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (EGrouped
       [ ESymbol Ord "\8706" , ESub (EIdentifier "v") (EIdentifier "z") ])
    (EGrouped [ ESymbol Ord "\8706" , EIdentifier "z" ])
]