class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">​</span></span><span class="reset-textstyle scriptstyle uncramped"><span class="mord mathit">n</span></span></span><span class="baseline-fix"><span class="fontsize-ensurer reset-size5 size5"><span style="font-size:0em;">​</span></span>​</span></span></span></span></span></span></span></eqn><span>(2)</span></section></td>
      <td style="text-align:left;">Sum with equation number.</td>
    </tr>
   <tr id="#31">
      <td style="t