rec-int3

integral of f(x) with bounds

W3C sample	WIRIS
	$x 0 a f x$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <int/>
    <bvar>
      <ci>x</ci>
    </bvar>
    <lowlimit>
      <cn>0</cn>
    </lowlimit>
    <uplimit>
      <ci>a</ci>
    </uplimit>
    <apply>
      <ci>f</ci>
      <ci>x</ci>
    </apply>
  </apply>
</math>

Author: MathML 2 Recommendation