ize5"><span style="font-size:0em;">​</span></span><span class="reset-textstyle scriptstyle uncramped"><span class="mord mathrm">2</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 class="mbin">−</span><span class="mord mathrm">1</span></span></span></span></span></eqn><span>(1)</span></section></td>
      <td style="text-align:left;">display equation with equation number.</td>
    </