EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/math/doc/equations/digamma1.mml

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      <mrow>
        <mi>x</mi>
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    <mspace width="1em"/>
    <mo>=</mo>
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    <mfrac>
      <mi>d</mi>
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        <mi>d</mi>
        <mi>x</mi>
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    <mi>ln</mi>
    <mfenced>
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        <mi>&#x0393;</mi>
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          <mrow>
            <mi>x</mi>
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    <mspace width="1em"/>
    <mo>=</mo>
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    <mfrac>
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        <msup>
          <mi>&#x0393;</mi>
          <mo>&#x2032;</mo>
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          <mrow>
            <mi>x</mi>
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            <mi>x</mi>
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</math>