boost_1_45_0/libs/math/doc/sf_and_dist/equations/expint_i_3.mml

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mtext>Ei</mtext>
    <mfenced>
      <mrow>
        <mi>z</mi>
      </mrow>
    </mfenced>
    <mo>=</mo>
    <mi>log</mi>
    <mfenced>
      <mrow>
        <mfrac>
          <mi>z</mi>
          <msub>
            <mi>z</mi>
            <mn>0</mn>
          </msub>
        </mfrac>
      </mrow>
    </mfenced>
    <mo>+</mo>
    <mfenced>
      <mrow>
        <mi>z</mi>
        <mo>&#x2212;</mo>
        <msub>
          <mi>z</mi>
          <mn>0</mn>
        </msub>
      </mrow>
    </mfenced>
    <mi>R</mi>
    <mfenced>
      <mrow>
        <mfrac>
          <mi>z</mi>
          <mn>3</mn>
        </mfrac>
        <mo>&#x2212;</mo>
        <mn>1</mn>
      </mrow>
    </mfenced>
  </mrow>
</math>