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<b>let </b><font color="Maroon">p</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a> ;<br/>

<b>assume </b><a NAME="E1:7"/>
<font color="Maroon">p</font> is <a href="qc_lang1.html#V4">conjunctive</a>
 ;<br/>

<b>then consider </b><font color="Maroon">q</font> being    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> , <font color="Maroon">r</font> being    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> <b> such that </b><br/><a NAME="E3:7"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">q</font> <a href="qc_lang1.html#K13">'&amp;'</a> <font color="Maroon">r</font>
 <b>by </b><i><a class="ref" href="qc_lang1.html#D19">QC_LANG1:def 19</a></i>;<br/>
<a NAME="E4:7"/>
( <font color="Maroon">q</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a>  &amp; <font color="Maroon">r</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a>  )
 
<b>by </b><i>, <a class="ref" href="cqc_lang.html#T19">CQC_LANG:19</a></i>;<br/>
<b>hence </b><a NAME="E5:7"/>
 ex <font color="Olive">q</font>, <font color="Olive">r</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7">CQC-WFF</a>  st <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Olive">q</font> <a href="cqc_lang.html#K11">'&amp;'</a> <font color="Olive">r</font>
 <b>by </b><i/>;<br/>


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