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<p class="MsoNormal">On <i>Fri Jan 5 08:44:31 CET 2018 </i><b>Vafa Khalighi wrote<o:p></o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<pre>> What are the possible side effects<o:p></o:p></pre>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">The primitives \eqno and \leqno check if there is room for
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">The equation number. If there is not, they either shift the
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">equation slightly (i.e., uncenter it) or move the number to a
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">different line. In the latter case, \eqno puts it one line below
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">the equation and \leqno puts it one line above. In your example,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">TeX thinks this is a _<i>right</i>_ equation number that is only 0.01 pt
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">wide so there will be cases where \leqno will shift the equation
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">right while your faked version will not:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">$$<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">1+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=3\eqno\hbox{%<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">\hbox to .01pt{}\rlap{\hskip-\displaywidth<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">(1)}}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">$$<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">$$<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">1+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=31+2=3\leqno(1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">$$<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">\bye<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">If you make the equation a little longer, the number will overlap
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">the equation in the first case. If you make it still longer. The
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">equation number will be on the line below in the first case and
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">on the line above in the second case.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Dan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Daniel H. Luecking, Graduate Coordinator<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Dept. of Mathematical Sciences<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">University of Arkansas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Fayetteville, AR, USA<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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