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<a NAME="E1:10_1_1"/>
 <a href="qc_lang1.html#K11" title="QC_LANG1:func.11">VERUM</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">{<span class="default"> <font color="Olive" title="b1">s</font> where <font color="Olive" title="b1">s</font> is   <a href="qc_lang1.html#NM8" title="QC_LANG1:NM.8">QC-formula</a> : (  <a href="qc_lang3.html#K6" title="QC_LANG3:func.6">Fixed</a> <font color="Olive" title="b1">s</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  &amp;  <a href="qc_lang3.html#K5" title="QC_LANG3:func.5">Free</a> <font color="Olive" title="b1">s</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  ) </span>}</span> 
 
<b>by </b><i><a class="ref" href="qc_lang3.html#T65" title="QC_LANG3:th.65">QC_LANG3:65</a>, <a class="ref" href="qc_lang3.html#T76" title="QC_LANG3:th.76">QC_LANG3:76</a></i>;<br/>
<b>hence </b><a NAME="E2:10_1_1"/>
not  <a href="cqc_lang.html#K4" title="CQC_LANG:func.4">CQC-WFF</a>  is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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