boost_1_45_0/libs/math/doc/sf_and_dist/equations/erf2.mml

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mtext>erfc</mtext>
    <mfenced>
      <mrow>
        <mi>z</mi>
      </mrow>
    </mfenced>
    <mspace width="1em"/>
    <mo>=</mo>
    <mspace width="1em"/>
    <mn>1</mn>
    <mo>&#x2212;</mo>
    <mtext>erf</mtext>
    <mfenced>
      <mrow>
        <mi>z</mi>
      </mrow>
    </mfenced>
  </mrow>
</math>