<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
   <semantics xmlns="">
      <mrow>
         <mo>∇</mo>
         <mo>×</mo>
         <mstyle mathvariant="bold">
            <mi mathvariant="bold">E</mi>
         </mstyle>
         <mo>=</mo>
         <mo>−</mo>
         <mfrac>
            <mrow>
               <mo>∂</mo>
               <mstyle mathvariant="bold">
                  <mi mathvariant="bold">B</mi>
               </mstyle>
            </mrow>
            <mrow>
               <mo>∂</mo>
               <mi>t</mi>
            </mrow>
         </mfrac>
      </mrow>
      <annotation encoding="application/x-tex">\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}} {\partial t}</annotation>
   </semantics>
</math>
