er-bottom-width:0.04em"></span></span><span style="top:-3.7350000000000003em;"><span class="pstrut" style="height:3em;"></span><span class="mord" style=""><span class="mop" style=""><span style="">e</span><span style="">x</span><span style="">p</span></span><span class="mopen" style="">(</span><span class="mord" style=""><span class="mopen nulldelimiter"></span><span class="mfrac"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.7114919999999999em;"><span style="top:-