boost_1_45_0/libs/math/doc/sf_and_dist/equations/ellint20.mml

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    <mi>K</mi>
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    <mspace width="1em"/>
    <mo>=</mo>
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    <msub>
      <mi>R</mi>
      <mi>F</mi>
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    <mfenced>
      <mrow>
        <mn>0,1</mn>
        <mo>&#x2212;</mo>
        <msup>
          <mi>k</mi>
          <mn>2</mn>
        </msup>
        <mo>,</mo>
        <mn>1</mn>
      </mrow>
    </mfenced>
  </mrow>
</math>