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    <annotation encoding="application/x-tex" id="p1.1.m1.1c">{\displaystyle{\displaystyle\nabla\Phi}}</annotation>
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<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="{\displaystyle \nabla \Phi }">
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    <mrow class="MJX-TeXAtom-ORD">
      <mstyle displaystyle="true" scriptlevel="0">
        <mi mathvariant="normal">&#x2207;<!-- ∇ --></mi>
        <mi mathvariant="normal">&#x03A6;<!-- Φ --></mi>
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    <annotation encoding="application/x-tex">{\displaystyle \nabla \Phi }</annotation>
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