M4.ptx

<exercise>
  <statement>
      <p>Show how to find the inverse of the matrix <m><xsl:value-of select="name"/>=<xsl:value-of select="matrix"/></m>.</p>
  </statement>
  <answer>
      <me><xsl:value-of select="name"/>^{-1}=<xsl:value-of select="inverse"/></me>
  </answer>
</exercise>