General::prebin: 
   RawBoxes[RowBox[{∇, ×, E}]] cannot be interpreted. The prefix operator 
    RawBoxes[∇] cannot be combined with the binary operator ×.

ToExpression::esntx: 
   Could not parse \nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}}
     {\partial t} as input.

<math 
  xmlns='http://www.w3.org/1998/Math/MathML'>
  <semantics>
    <mi>$Failed</mi>
    <annotation-xml encoding='MathML-Content'>
      <ci>$Failed</ci>
    </annotation-xml>
  </semantics>
</math>