"  
class="td11">   </td></tr></table>
     </div>
     <p class="noindent"> Complex numbers are an algebraic type.
     <p class="noindent"> For a complex number <span 
class="pcrr7t-">z</span>, <span 
class="pcrr7t-">abs</span><span 
class="pcrr7t-">&#x00A0;z </span>is a number with the magnitude of <span 
class="pcrr7t-">z</span>, but oriented in the positive real
     direction, whereas <span 
class="pcrr7t-">signum</span><span 
class="pcrr7t-">&#x00A0;z </span>has the phase of <span 
class="pcrr7t-">z<