<?xml version="1.0"?>
<div><span class="kw">theorem </span><a NAME="T1"><span class="comment"><font color="firebrick">:: ZFREFLE1:1</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">M</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <font color="Olive" title="b1">M</font> <a href="zfrefle1.html#R1" title="ZFREFLE1:pred.1">|=</a>  <a href="subset_1.html#K1" title="SUBSET_1:func.1">{}</a> <a href="zf_lang.html#K8" title="ZF_LANG:func.8">WFF</a> ;<br/></div></div>
