data/pom/53.xml
<?xml version="1.0" ?>
<math type="pom-exported">
<expression prime-tag="sequence">
<term prime-tag="letter" secondary-tags="Latin">E</term>
<expression prime-tag="balanced-expression">
<term prime-tag="left-delimiter">\left[</term>
<expression prime-tag="sequence">
<term prime-tag="latex-command" secondary-tags="accented">\sigma</term>
<expression prime-tag="caret" secondary-tags="superscript_operation">
<term prime-tag="digit" secondary-tags="numeric">2</term>
</expression>
</expression>
<term prime-tag="right-delimiter">\right]</term>
</expression>
<term prime-tag="equals">=</term>
<expression prime-tag="fraction">
<expression prime-tag="sequence" secondary-tags="numerator">
<term prime-tag="letter" secondary-tags="Latin">n</term>
<term prime-tag="minus">-</term>
<term prime-tag="digit" secondary-tags="numeric">1</term>
</expression>
<term prime-tag="letter" secondary-tags="Latin">n</term>
</expression>
<term prime-tag="latex-command">\sigma</term>
<expression prime-tag="caret" secondary-tags="superscript_operation">
<term prime-tag="digit" secondary-tags="numeric">2</term>
</expression>
</expression>
</math>