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<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">  <mfenced open="[" close="|">    <mrow>      <mtable>        <mtr>          <mtd>            <mi mathvariant="normal">U</mi>
          </mtd>
        </mtr>         <mtr>          <mtd>            <mi mathvariant="normal">V</mi>
          </mtd>
        </mtr>       </mtable>     </mrow>   </mfenced>   <mo>=</mo>   <mfenced open="|" close="]">    <mrow>      <mtable>        <mtr>          <mtd>            <mi mathvariant="normal">U</mi>
          </mtd>
        </mtr>         <mtr>          <mtd>            <mi mathvariant="normal">V</mi>
          </mtd>
        </mtr>       </mtable>     </mrow>   </mfenced> </math>