legendre_4.mml

Boost provides free peer-reviewed portable C++ source libraries. We emphasize libraries that work

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <msub>
      <mi>P</mi>
      <mrow>
        <mi>l</mi>
        <mo>+</mo>
        <mn>1</mn>
      </mrow>
    </msub>
    <mfenced>
      <mrow>
        <mi>x</mi>
      </mrow>
    </mfenced>
    <mspace width="1em"/>
    <mo>=</mo>
    <mspace width="1em"/>
    <mfrac>
      <mrow>
        <mfenced>
          <mrow>
            <mn>2</mn>
            <mi>l</mi>
            <mo>+</mo>
            <mn>1</mn>
          </mrow>
        </mfenced>
        <mi>x</mi>
        <msub>
          <mi>P</mi>
          <mi>l</mi>
        </msub>
        <mfenced>
          <mrow>
            <mi>x</mi>
          </mrow>
        </mfenced>
        <mo>&#x2212;</mo>
        <mi>l</mi>
        <msub>
          <mi>P</mi>
          <mrow>
            <mi>l</mi>
            <mo>&#x2212;</mo>
            <mn>1</mn>
          </mrow>
        </msub>
        <mfenced>
          <mrow>
            <mi>x</mi>
          </mrow>
        </mfenced>
      </mrow>
      <mfenced>
        <mrow>
          <mi>l</mi>
          <mo>+</mo>
          <mn>1</mn>
        </mrow>
      </mfenced>
    </mfrac>
  </mrow>
</math>