<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">T</font> be   <a href="subset_1.html#NM2">Subset</a> of <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>

<b>assume </b><a NAME="E1:57"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">T</font> <a href="cqc_the1.html#NR1" target="_self">is_a_theory</a> 
 ;<br/>

<a NAME="E2:57"/>
 <a href="subset_1.html#K1">{}</a> <a href="cqc_lang.html#K7">CQC-WFF</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">T</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>
<a NAME="E3:57"/><b>then </b>
 <a href="cqc_the1.html#K1" target="_self">Cn</a> <span class="p1">(<span class="default"><a href="subset_1.html#K1">{}</a> <a href="cqc_lang.html#K7">CQC-WFF</a> </span>)</span> <a href="tarski.html#R1">c=</a>  <a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">T</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:57"/>
 <a href="cqc_the1.html#K4" target="_self">TAUT</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">T</font>
 <b>by </b><i>, </i>;<br/>


</div>
