<math xmlns="http://www.w3.org/1998/Math/MathML" id="p1.1.m1.1" class="ltx_Math" alttext="{\displaystyle(f\in A)}" display="inline">
  <semantics id="p1.1.m1.1a">
    <mrow id="p1.1.m1.1.6" xref="p1.1.m1.1.6.2.cmml">
      <mo stretchy="false" id="p1.1.m1.1.1" xref="p1.1.m1.1.6.2.cmml">(</mo>
      <mrow id="p1.1.m1.1.6.2" xref="p1.1.m1.1.6.2.cmml">
        <mi id="p1.1.m1.1.2" xref="p1.1.m1.1.2.cmml">f</mi>
        <mo id="p1.1.m1.1.3" xref="p1.1.m1.1.3.cmml">∈</mo>
        <mi id="p1.1.m1.1.4" xref="p1.1.m1.1.4.cmml">A</mi>
      </mrow>
      <mo stretchy="false" id="p1.1.m1.1.5" xref="p1.1.m1.1.6.2.cmml">)</mo>
    </mrow>
    <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b">
      <apply id="p1.1.m1.1.6.2.cmml" xref="p1.1.m1.1.6">
        <in id="p1.1.m1.1.3.cmml" xref="p1.1.m1.1.3"/>
        <ci id="p1.1.m1.1.2.cmml" xref="p1.1.m1.1.2">𝑓</ci>
        <ci id="p1.1.m1.1.4.cmml" xref="p1.1.m1.1.4">𝐴</ci>
      </apply>
    </annotation-xml>
    <annotation encoding="application/x-tex" id="p1.1.m1.1c">{\displaystyle(f\in A)}</annotation>
  </semantics>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\displaystyle (f\in A)}">
  <semantics>
    <mrow class="MJX-TeXAtom-ORD">
      <mstyle displaystyle="true" scriptlevel="0">
        <mo stretchy="false">(</mo>
        <mi>f</mi>
        <mo>&#x2208;<!-- ∈ --></mo>
        <mi>A</mi>
        <mo stretchy="false">)</mo>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">{\displaystyle (f\in A)}</annotation>
  </semantics>
</math>