boost_1_45_0/libs/math/doc/sf_and_dist/equations/hermite_1.mml

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    <msub>
      <mi>H</mi>
      <mrow>
        <mi>n</mi>
        <mo>+</mo>
        <mn>1</mn>
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    </msub>
    <mfenced>
      <mrow>
        <mi>x</mi>
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    <mspace width="1em"/>
    <mo>=</mo>
    <mspace width="1em"/>
    <mn>2</mn>
    <mi>x</mi>
    <msub>
      <mi>H</mi>
      <mi>n</mi>
    </msub>
    <mfenced>
      <mrow>
        <mi>x</mi>
      </mrow>
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    <mo>&#x2212;</mo>
    <mn>2</mn>
    <mi>n</mi>
    <msub>
      <mi>H</mi>
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        <mi>n</mi>
        <mo>&#x2212;</mo>
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    <mfenced>
      <mrow>
        <mi>x</mi>
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  </mrow>
</math>