ag-gipp/GoUldI

<math 
  xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="left-parenthesis upper X comma normal upper Sigma right-parenthesis">
  <semantics>
    <mrow data-semantic-type="fenced" data-semantic-role="leftright" data-semantic-id="6" data-semantic-children="5" data-semantic-content="0,4">
      <mo stretchy="false" data-semantic-type="fence" data-semantic-role="open" data-semantic-id="0" data-semantic-parent="6" data-semantic-operator="fenced">(</mo>
      <mrow data-semantic-type="punctuated" data-semantic-role="sequence" data-semantic-id="5" data-semantic-children="1,2,3" data-semantic-content="2" data-semantic-parent="6">
        <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="1" data-semantic-parent="5">X</mi>
        <mo data-semantic-type="punctuation" data-semantic-role="comma" data-semantic-id="2" data-semantic-parent="5" data-semantic-operator="punctuated">,</mo>
        <mi mathvariant="normal" data-semantic-type="identifier" data-semantic-role="greekletter" data-semantic-font="normal" data-semantic-id="3" data-semantic-parent="5">Σ
          <!-- Σ -->
        </mi>
      </mrow>
      <mo stretchy="false" data-semantic-type="fence" data-semantic-role="close" data-semantic-id="4" data-semantic-parent="6" data-semantic-operator="fenced">)</mo>
    </mrow>
    <annotation encoding="application/x-tex">(X,\Sigma )</annotation>
  </semantics>
</math>