rec-inverse3

W3C sample WIRIS
[N/A] inverse a matrix A 
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <apply>
      <csymbol cd="fns1">inverse</csymbol>
      <semantics>
        <ci>a</ci>
        <annotation-xml cd="mathmltypes" name="type" encoding="MathML-Content">
          <ci>matrix</ci>
        </annotation-xml>
      </semantics>
    </apply>
    <ci>A</ci>
  </apply>
</math>

Author: MathML 2 Recommendation