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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="substut1.html#K16" target="_self">QC-Sub-WFF</a> ;<br/>

<b>set </b><font color="Maroon">c<sub>2</sub></font> =  <a href="substut1.html#K20" target="_self">Sub_not</a> <font color="Maroon">c<sub>1</sub></font>;<br/>
<a NAME="E1:83"/>
 <a href="substut1.html#K27" target="_self">Sub_the_argument_of</a> <span class="p1">(<span class="default"><a href="substut1.html#K20" target="_self">Sub_not</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="substut1.html#D30" target="_self">Def30</a></i>;<br/>
<b>hence </b><a NAME="E2:83"/>
 <a href="substut1.html#K37" target="_self">CQC_Sub</a> <span class="p1">(<span class="default"><a href="substut1.html#K20" target="_self">Sub_not</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="qc_lang1.html#K12">'not'</a> <span class="p1">(<span class="default"><a href="substut1.html#K37" target="_self">CQC_Sub</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 <b>by </b><i><a class="ref" href="substut1.html#T28" target="_self">Th28</a></i>;<br/>


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