                                               </div> <dd class="haddockdesc">
     The phase of a complex number, in the range <span 
class="pcrr7t-">(-pi,</span><span 
class="pcrr7t-">&#x00A0;pi]</span>. If the magnitude is zero, then so is the
     phase.
     </dl>
                                                                                   

                                                                                   
<p class="noindent">
<h3 class="sectionHead"><span class="titlemark">17.3