Example ex5-13

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Next: ex5-14

X 1 X

<math>
<semantics>
   <apply> <factorial/> <mi>X</mi> </apply>
   <annotation-xml encoding="MathML-Presentation">
      <msup>
         <mn>1</mn>
         <mover accent="true">
            <mi>X</mi>
            <mo>‾</mo>
         </mover>
      </msup>
   </annotation-xml>
</semantics>
</math>