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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being    <a href="subset_1.html#M1">Element</a> of  <a href="substut1.html#K1" target="_self">vSUB</a> ;<br/>
<b>reconsider </b><font color="Maroon">c<sub>2</sub></font> = <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><a href="cqc_lang.html#K9">VERUM</a> ,<font color="Maroon">c<sub>1</sub></font></span><a href="domain_1.html#K1">]</a></span> as    <a href="subset_1.html#M1">Element</a> of  <a href="substut1.html#K16" target="_self">QC-Sub-WFF</a>  <b>by </b><i><a class="ref" href="substut1.html#D16" target="_self">Def16</a>, <a class="ref" href="qc_lang1.html#D13">QC_LANG1:def 13</a></i>;<br/>
<a NAME="E3:88_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="substut1.html#K18" target="_self">`1</a>  <a href="hidden.html#R1">=</a>  <a href="cqc_lang.html#K9">VERUM</a> 
 
<b>by </b><i><a class="ref" href="mcart_1.html#T7">MCART_1:7</a></i>;<br/>
<a NAME="E4:88_1_1"/><b>then </b>
<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><a href="cqc_lang.html#K9">VERUM</a> ,<font color="Maroon">c<sub>1</sub></font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a>  <a href="substut1.html#K38" target="_self">CQC-Sub-WFF</a> 
 
;<br/>
<b>hence </b><a NAME="E5:88_1_1"/>
not  <a href="substut1.html#K38" target="_self">CQC-Sub-WFF</a>  is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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