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0 1 f ( x ) x

Source Code:

    <math>
      <mstyle displaystyle='true'>
        <msubsup>
          <mo>&#x0222B;</mo>
          <mn>0</mn>
          <mn>1</mn>
        </msubsup>
        <mi>f</mi>
        <mrow> 
          <mo>(</mo>
          <mi>x</mi>
          <mo>)</mo>
        </mrow>
        <mtext>&#x0200A;</mtext>
        <mo>&#x02146;</mo>
        <mi>x</mi>
      </mstyle>
    </math>