exponential e
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<csymbol cd="relation1">eq</csymbol>
<apply>
<csymbol cd="transc1">ln</csymbol>
<csymbol cd="nums1">e</csymbol>
</apply>
<cn>1</cn>
</apply>
</math>
Author: MathML 2 Recommendation