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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="qc_lang1.html#NM8">QC-formula</a>;<br/>

<a NAME="E1:80"/>
(  <a href="cqc_the1.html#NR5" target="_self">|-</a> <font color="Maroon">c<sub>1</sub></font> iff  <a href="subset_1.html#K1">{}</a> <a href="cqc_lang.html#K7">CQC-WFF</a>  <a href="cqc_the1.html#R3" target="_self">|-</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="cqc_the1.html#D10" target="_self">Def10</a></i>;<br/>
<b>hence </b><a NAME="E2:80"/>
(  <a href="cqc_the1.html#NR5" target="_self">|-</a> <font color="Maroon">c<sub>1</sub></font> iff <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="cqc_the1.html#K4" target="_self">TAUT</a>  )
 <b>by </b><i><a class="ref" href="cqc_the1.html#D9" target="_self">Def9</a></i>;<br/>


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