 class="paramname"><em>head</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="classoperations__research_1_1sat_1_1BoolVar.html">BoolVar</a>&#160;</td>
          <td class="paramname"><em>literal</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Add an arc to the circuit. </p>
<dl class="par