fix"></span></span></span></span><span class="mspace mtight" style="margin-right:0.10037499999999999em"></span><span class="mord mathnormal mtight" style="margin-right:0.04398em">z</span></span></span></span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.143em;"><span></span></span></span></span></span></span><span class="mopen mtight" style="">(</span><span class="mord mtight" style=""><span class="mord mtight coloredeq eqo" style=""><s