<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: WAYBEL34:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">W</font> being   <a href="setfam_1.html#NV3" title="SETFAM_1:NV.3">with_non-empty_element</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <font color="Olive" title="b1">W</font> <a href="waybel34.html#K4" title="WAYBEL34:func.4">-INF_category</a> ,<font color="Olive" title="b1">W</font> <a href="waybel34.html#K5" title="WAYBEL34:func.5">-SUP_category</a>  <a href="functor0.html#R2" title="FUNCTOR0:pred.2">are_anti-isomorphic</a> </div></div>
