al; font-style: italic;">cloth</span>(<span
 style="font-style: italic; font-weight: bold;">L</span>)<br>
= <span style="font-family: arial; font-style: italic;">closed-theories</span>(<span
 style="font-style: italic; font-weight: bold;">L</span>)<br>
      </td>
      <td style="vertical-align: top;">formal concepts:<br>
closed theories whose base language is <span
 style="font-style: italic; font-weight: bold;">L</span><br>
      </td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><span
 styl