ag-gipp/GoUldI

<math 
  xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="eta equals StartFraction upper Q 1 minus upper Q 2 Over upper Q 1 EndFraction">
  <semantics>
    <mrow data-semantic-type="relseq" data-semantic-role="equality" data-semantic-id="14" data-semantic-children="0,13" data-semantic-content="1">
      <mi data-semantic-type="identifier" data-semantic-role="greekletter" data-semantic-font="italic" data-semantic-id="0" data-semantic-parent="14">η
        <!-- η -->
      </mi>
      <mo data-semantic-type="relation" data-semantic-role="equality" data-semantic-id="1" data-semantic-parent="14" data-semantic-operator="relseq,=">=</mo>
      <mrow class="MJX-TeXAtom-ORD">
        <mfrac data-semantic-type="fraction" data-semantic-role="division" data-semantic-id="13" data-semantic-children="9,12" data-semantic-parent="14">
          <mrow data-semantic-type="infixop" data-semantic-role="subtraction" data-semantic-id="9" data-semantic-children="4,8" data-semantic-content="5" data-semantic-parent="13">
            <msub data-semantic-type="subscript" data-semantic-role="latinletter" data-semantic-id="4" data-semantic-children="2,3" data-semantic-parent="9">
              <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="2" data-semantic-parent="4">Q</mi>
              <mrow class="MJX-TeXAtom-ORD">
                <mn data-semantic-type="number" data-semantic-role="integer" data-semantic-font="normal" data-semantic-id="3" data-semantic-parent="4">1</mn>
              </mrow>
            </msub>
            <mo data-semantic-type="operator" data-semantic-role="subtraction" data-semantic-id="5" data-semantic-parent="9" data-semantic-operator="infixop,−">−
              <!-- − -->
            </mo>
            <msub data-semantic-type="subscript" data-semantic-role="latinletter" data-semantic-id="8" data-semantic-children="6,7" data-semantic-parent="9">
              <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="6" data-semantic-parent="8">Q</mi>
              <mrow class="MJX-TeXAtom-ORD">
                <mn data-semantic-type="number" data-semantic-role="integer" data-semantic-font="normal" data-semantic-id="7" data-semantic-parent="8">2</mn>
              </mrow>
            </msub>
          </mrow>
          <msub data-semantic-type="subscript" data-semantic-role="latinletter" data-semantic-id="12" data-semantic-children="10,11" data-semantic-parent="13">
            <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="10" data-semantic-parent="12">Q</mi>
            <mrow class="MJX-TeXAtom-ORD">
              <mn data-semantic-type="number" data-semantic-role="integer" data-semantic-font="normal" data-semantic-id="11" data-semantic-parent="12">1</mn>
            </mrow>
          </msub>
        </mfrac>
      </mrow>
    </mrow>
    <annotation encoding="application/x-tex">\eta ={\frac {Q_{1}-Q_{2}}{Q_{1}}}</annotation>
  </semantics>
</math>