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

<b>let </b><font color="Maroon">p</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> ;<br/><b>let </b><font color="Maroon">q</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> ;<br/><b>let </b><font color="Maroon">p1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> ;<br/><b>let </b><font color="Maroon">q1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> ;<br/>







<b>assume </b><a NAME="E1:12"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">p</font> <a href="qc_lang2.html#K2" target="_self">=&gt;</a> <font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p1</font> <a href="qc_lang2.html#K2" target="_self">=&gt;</a> <font color="Maroon">q1</font>
 ;<br/>

<a NAME="E2:12"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">p</font> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p1">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">q</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">p1</font> <a href="qc_lang1.html#K13">'&amp;'</a> <span class="p1">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">q1</font></span>)</span>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E3:12"/>
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p1</font>
 <b>by </b><i/>;<br/>

<a NAME="E4:12"/>
 <a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">q1</font>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E5:12"/>
<font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">q1</font>
 <b>by </b><i/>;<br/>


</div>
