<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E27">Th57</font></span>: <a NAME="T17"><span class="comment"><font color="firebrick">:: PROOFS_1:17</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">Fml</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> <br/>  for <font color="Olive" title="b2">B</font> being   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Olive" title="b1">Fml</font><br/>  for <font color="Olive" title="b3">R</font> being    <a href="proofs_1.html#M1" title="PROOFS_1:mode.1">Rule</a> of <font color="Olive" title="b1">Fml</font><br/>  for <font color="Olive" title="b4">a</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">object</a>   st <font color="Olive" title="b2">B</font>,<font color="Olive" title="b3">R</font> <a href="proofs_1.html#R2" title="PROOFS_1:pred.2">|-</a> <font color="Olive" title="b4">a</font> holds <br/><font color="Olive" title="b4">a</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Olive" title="b1">Fml</font></div></div>
