boost_1_45_0/libs/math/doc/sf_and_dist/equations/gamma_ratio1.mml

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    <mtext>tgamma_delta_ratio(a,delta)</mtext>
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    <mo>=</mo>
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        <mi>&#x0393;</mi>
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            <mi>a</mi>
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      </mrow>
      <mrow>
        <mi>&#x0393;</mi>
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            <mi>a</mi>
            <mo>+</mo>
            <mi>d</mi>
            <mi>e</mi>
            <mi>l</mi>
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            <mi>a</mi>
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