<math xmlns="http://www.w3.org/1998/Math/MathML" id="p1.1.m1.1" class="ltx_Math" alttext="{\displaystyle{\displaystyle\left|{\bar{m}}\right|}}" display="inline">
  <semantics id="p1.1.m1.1a">
    <mrow id="p1.1.m1.1.4" xref="p1.1.m1.1.4.1.cmml">
      <mo id="p1.1.m1.1.1" xref="p1.1.m1.1.4.1.1.cmml">|</mo>
      <mover accent="true" id="p1.1.m1.1.2" xref="p1.1.m1.1.2.cmml">
        <mi id="p1.1.m1.1.2.2" xref="p1.1.m1.1.2.2.cmml">m</mi>
        <mo stretchy="false" id="p1.1.m1.1.2.1" xref="p1.1.m1.1.2.1.cmml">¯</mo>
      </mover>
      <mo id="p1.1.m1.1.3" xref="p1.1.m1.1.4.1.1.cmml">|</mo>
    </mrow>
    <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b">
      <apply id="p1.1.m1.1.4.1.cmml" xref="p1.1.m1.1.4">
        <abs id="p1.1.m1.1.4.1.1.cmml" xref="p1.1.m1.1.1"/>
        <apply id="p1.1.m1.1.2.cmml" xref="p1.1.m1.1.2">
          <ci id="p1.1.m1.1.2.1.cmml" xref="p1.1.m1.1.2.1">¯</ci>
          <ci id="p1.1.m1.1.2.2.cmml" xref="p1.1.m1.1.2.2">𝑚</ci>
        </apply>
      </apply>
    </annotation-xml>
    <annotation encoding="application/x-tex" id="p1.1.m1.1c">{\displaystyle{\displaystyle\left|{\bar{m}}\right|}}</annotation>
  </semantics>
</math>

<math class="mwe-math-element" xmlns="http://www.w3.org/1998/Math/MathML"><mrow data-mjx-texclass="ORD"><mstyle displaystyle="true" scriptlevel="0"><mrow data-mjx-texclass="INNER"><mo data-mjx-texclass="OPEN">|</mo><mrow data-mjx-texclass="ORD"><mrow data-mjx-texclass="ORD"><mover><mi>m</mi><mo>¯</mo></mover></mrow></mrow><mo data-mjx-texclass="CLOSE">|</mo></mrow></mstyle></mrow></math>