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

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

<a NAME="E1:23"/>
(  <a href="cqc_the1.html#K1" target="_self">Cn</a> <span class="p1">(<span class="default"><a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font> &amp;  <a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a>  <a href="cqc_the1.html#K1" target="_self">Cn</a> <span class="p1">(<span class="default"><a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font></span>)</span> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E2:23"/>
 <a href="cqc_the1.html#K1" target="_self">Cn</a> <span class="p1">(<span class="default"><a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cqc_the1.html#K1" target="_self">Cn</a> <font color="Maroon">X</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a></i>;<br/>


</div>
