boost_1_45_0/libs/math/doc/sf_and_dist/equations/chi_squ_tut2.mml

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mrow>
      <msubsup>
        <mi>&#x03C7;</mi>
        <mrow>
          <mfenced>
            <mrow>
              <mfrac>
                <mi>&#x03B1;</mi>
                <mn>2,</mn>
              </mfrac>
              <mi>N</mi>
              <mo>&#x2212;</mo>
              <mn>1</mn>
            </mrow>
          </mfenced>
        </mrow>
        <mn>2</mn>
      </msubsup>
    </mrow>
  </mrow>
</math>