<?xml version="1.0" ?>
<math type="pom-exported">
  <expression prime-tag="sequence">
    <term prime-tag="latex-command">\eta</term>
    <term prime-tag="equals">=</term>
    <expression prime-tag="fraction">
      <term prime-tag="text">work done</term>
      <term prime-tag="text">heat absorbed</term>
    </expression>
    <term prime-tag="equals">=</term>
    <expression prime-tag="fraction">
      <expression prime-tag="sequence" secondary-tags="numerator">
        <term prime-tag="alphanumeric">Q1</term>
        <term prime-tag="minus">-</term>
        <term prime-tag="alphanumeric">Q2</term>
      </expression>
      <term prime-tag="alphanumeric">Q1</term>
    </expression>
  </expression>
</math>