;"><span
 style="font-family: arial; font-style: italic;">expr</span>(<span
 style="font-weight: bold; font-style: italic;">f</span>)<br>
= <span style="font-family: arial; font-style: italic;">expression</span>(<span
 style="font-weight: bold; font-style: italic;">f</span>)<br>
      </td>
      <td style="vertical-align: top;">type (formal attribute) function:<br>
expression function of <span
 style="font-style: italic; font-weight: bold;">f</span> </td>
    </tr>
    <tr>
      <td style="vertical-align: