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0 1 f ( x ) x

Source Code:

    <math>
      <munderover>
        <mo>&#x0222B;</mo>
        <mn>0</mn>
        <mn>1</mn>
      </munderover>
      <mi>f</mi>
      <mrow> 
        <mo>(</mo>
        <mi>x</mi>
        <mo>)</mo>
      </mrow>
      <mtext>&#x0200A;</mtext>
      <mo>&#x02146;</mo>
      <mi>x</mi>
    </math>