<math xmlns='http://www.w3c.org/mathml' version='2.0'>
  <apply> <forall/>
    <condition>
      <apply> <in/>
        <ci> x </ci> 
        <ci> &reals; </ci> 
      </apply>
    </condition>
    <apply> <eq/>
      <apply> <power/>
        <ci> &exponentiale; </ci>
        <apply> <minus/>
          <ci> x </ci> 
        </apply>
      </apply>
      <apply> <plus/>
        <cn> 1 </cn> 
        <apply> <minus/>
          <ci> x </ci> 
        </apply>
        <apply> <divide/>
          <apply> <power/>
            <ci> x </ci> 
            <cn> 2 </cn> 
          </apply>
          <apply> <factorial/>
            <cn> 2 </cn> 
          </apply>
        </apply>
        <apply> <minus/>
          <apply> <divide/>
            <apply> <power/>
              <ci> x </ci> 
              <cn> 3 </cn> 
            </apply>
            <apply> <factorial/>
              <cn> 3 </cn> 
            </apply>
          </apply>
        </apply>
        <ci> &cdots; </ci>
        <apply> <times/>
          <apply> <power/>
            <apply> <minus/>
              <cn> 1 </cn> 
            </apply>
            <ci> n </ci> 
          </apply>
          <apply> <divide/>
            <apply> <power/>
              <ci> x </ci> 
              <ci> n </ci> 
            </apply>
            <apply> <factorial/>
              <ci> n </ci> 
            </apply>
          </apply>
          <ci> &cdots; </ci>
        </apply>
      </apply>
    </apply>
  </apply>
</math>