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<b>let </b><font color="Maroon">x</font> be   <a href="qc_lang1.html#NM3">bound_QC-variable</a>;<br/><b>let </b><font color="Maroon">r</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7" target="_self">CQC-WFF</a> ;<br/>



<a NAME="E1:32"/>
 <a href="qc_lang2.html#K5">Ex</a> <font color="Maroon">x</font>,<font color="Maroon">r</font> <a href="hidden.html#R1">=</a>  <a href="cqc_lang.html#K10" target="_self">'not'</a> <span class="p1">(<span class="default"><a href="cqc_lang.html#K15" target="_self">All</a> <font color="Maroon">x</font>,<span class="p2">(<span class="default"><a href="cqc_lang.html#K10" target="_self">'not'</a> <font color="Maroon">r</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 NAME="E2:32"/>
 <a href="qc_lang2.html#K5">Ex</a> <font color="Maroon">x</font>,<font color="Maroon">r</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="cqc_lang.html#K7" target="_self">CQC-WFF</a> 
 ;<br/>


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