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<b>let </b><font color="Maroon" title="c1">V</font> be  non <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <a href="qc_lang1.html#K1" title="QC_LANG1:func.1">QC-variables</a> ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide">  <a href="qc_lang3.html#K4" title="QC_LANG3:func.4">Vars</a> <a href="qc_lang2.html#K1" title="QC_LANG2:func.1">FALSUM</a> ,<font color="Maroon" title="c1">V</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </span><br/>

<b>thus </b> <a href="qc_lang3.html#K4" title="QC_LANG3:func.4">Vars</a> <a href="qc_lang2.html#K1" title="QC_LANG2:func.1">FALSUM</a> ,<font color="Maroon" title="c1">V</font> = 
 <a href="qc_lang3.html#K4" title="QC_LANG3:func.4">Vars</a> <a href="qc_lang1.html#K11" title="QC_LANG1:func.11">VERUM</a> ,<font color="Maroon" title="c1">V</font>
<b>by </b><i><a class="ref" href="qc_lang3.html#T50" target="_self" title="QC_LANG3:th.50">Th50</a>, <a class="ref" href="qc_lang2.html#D1" title="QC_LANG2:def.1">QC_LANG2:def 1</a></i>
<br/>.= 
 <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
<b>by </b><i><a class="txt" href="qc_lang3.html#E49"><i><font color="Green" title="E22">Lm2</font></i></a></i>
; <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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