divergence.test

<<< 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" ])
]
>>> mml
<?xml version='1.0' ?>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>∇</mi>
    <mo>⋅</mo>
    <mover>
      <mi>v</mi>
      <mo accent="true">→</mo>
    </mover>
    <mo>=</mo>
    <mfrac>
      <mrow>
        <mi>∂</mi>
        <msub>
          <mi>v</mi>
          <mi>x</mi>
        </msub>
      </mrow>
      <mrow>
        <mi>∂</mi>
        <mi>x</mi>
      </mrow>
    </mfrac>
    <mo>+</mo>
    <mfrac>
      <mrow>
        <mi>∂</mi>
        <msub>
          <mi>v</mi>
          <mi>y</mi>
        </msub>
      </mrow>
      <mrow>
        <mi>∂</mi>
        <mi>y</mi>
      </mrow>
    </mfrac>
    <mo>+</mo>
    <mfrac>
      <mrow>
        <mi>∂</mi>
        <msub>
          <mi>v</mi>
          <mi>z</mi>
        </msub>
      </mrow>
      <mrow>
        <mi>∂</mi>
        <mi>z</mi>
      </mrow>
    </mfrac>
  </mrow>
</math>