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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="qc_lang1.html#NM3">bound_QC-variable</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="qc_lang1.html#K8">QC-WFF</a> ;<br/>



<a NAME="E1:68"/>
 <a href="qc_lang2.html#K5">Ex</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><a href="qc_lang1.html#K14">All</a> <font color="Maroon">c<sub>1</sub></font>,<span class="p2">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="qc_lang2.html#D5">QC_LANG2:def 5</a></i>;<br/>
<b>hence </b> <a href="qc_lang3.html#K6" target="_self">Fixed</a> <span class="p1">(<span class="default"><a href="qc_lang2.html#K5">Ex</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span>)</span> = 
 <a href="qc_lang3.html#K6" target="_self">Fixed</a> <span class="p1">(<span class="default"><a href="qc_lang1.html#K14">All</a> <font color="Maroon">c<sub>1</sub></font>,<span class="p2">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="qc_lang3.html#T78" target="_self">Th78</a></i>
<br/>.= 
 <a href="qc_lang3.html#K6" target="_self">Fixed</a> <span class="p1">(<span class="default"><a href="qc_lang1.html#K12">'not'</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="qc_lang3.html#T81" target="_self">Th81</a></i>
<br/>.= 
 <a href="qc_lang3.html#K6" target="_self">Fixed</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="qc_lang3.html#T78" target="_self">Th78</a></i>
;<br/><br/>


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