ag-gipp/GoUldI

<math 
  xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="nabla times bold upper E equals minus StartFraction partial-differential bold upper B Over partial-differential t EndFraction">
  <semantics>
    <mrow data-semantic-type="relseq" data-semantic-role="equality" data-semantic-id="16" data-semantic-children="14,15" data-semantic-content="3">
      <mrow data-semantic-type="infixop" data-semantic-role="unknown" data-semantic-id="14" data-semantic-children="0,2" data-semantic-content="1" data-semantic-parent="16">
        <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="0" data-semantic-parent="14">∇
          <!-- ∇ -->
        </mi>
        <mo data-semantic-type="operator" data-semantic-role="unknown" data-semantic-id="1" data-semantic-parent="14" data-semantic-operator="infixop,×">×
          <!-- × -->
        </mo>
        <mrow class="MJX-TeXAtom-ORD">
          <mi mathvariant="bold" data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="bold" data-semantic-id="2" data-semantic-parent="14">E</mi>
        </mrow>
      </mrow>
      <mo data-semantic-type="relation" data-semantic-role="equality" data-semantic-id="3" data-semantic-parent="16" data-semantic-operator="relseq,=">=</mo>
      <mrow data-semantic-type="prefixop" data-semantic-role="negative" data-semantic-id="15" data-semantic-children="13" data-semantic-content="4" data-semantic-parent="16">
        <mo data-semantic-type="operator" data-semantic-role="subtraction" data-semantic-id="4" data-semantic-parent="15" data-semantic-operator="prefixop,−">−
          <!-- − -->
        </mo>
        <mrow class="MJX-TeXAtom-ORD">
          <mfrac data-semantic-type="fraction" data-semantic-role="division" data-semantic-id="13" data-semantic-children="8,12" data-semantic-parent="15">
            <mrow data-semantic-type="appl" data-semantic-role="prefix function" data-semantic-id="8" data-semantic-children="5,6" data-semantic-content="7" data-semantic-parent="13">
              <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="5" data-semantic-parent="8">∂
                <!-- ∂ -->
              </mi>
              <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="7" data-semantic-parent="8" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
              <mrow class="MJX-TeXAtom-ORD">
                <mi mathvariant="bold" data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="bold" data-semantic-id="6" data-semantic-parent="8">B</mi>
              </mrow>
            </mrow>
            <mrow data-semantic-type="appl" data-semantic-role="prefix function" data-semantic-id="12" data-semantic-children="9,10" data-semantic-content="11" data-semantic-parent="13">
              <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="9" data-semantic-parent="12">∂
                <!-- ∂ -->
              </mi>
              <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="11" data-semantic-parent="12" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
              <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="10" data-semantic-parent="12">t</mi>
            </mrow>
          </mfrac>
        </mrow>
      </mrow>
    </mrow>
    <annotation encoding="application/x-tex">\nabla \times \mathbf {E} =-{\frac {\partial \mathbf {B} }{\partial t}}</annotation>
  </semantics>
</math>