<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon" title="c1">s</font> be   <a href="qc_lang1.html#NM8" title="QC_LANG1:NM.8">QC-formula</a>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> ( <font color="Maroon" title="c1">s</font> is <a href="cqc_the1.html#V2" title="CQC_THE1:attr.2">valid</a> iff <font color="Maroon" title="c1">s</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="cqc_the1.html#K4" title="CQC_THE1:func.4">TAUT</a>  )</span><br/>

<a NAME="E1:66"/>
( <font color="Maroon" title="c1">s</font> is <a href="cqc_the1.html#V2" title="CQC_THE1:attr.2">valid</a> iff  <a href="subset_1.html#K1" title="SUBSET_1:func.1">{}</a> <a href="cqc_lang.html#K4" title="CQC_LANG:func.4">CQC-WFF</a>  <a href="cqc_the1.html#R3" title="CQC_THE1:pred.3">|-</a> <font color="Maroon" title="c1">s</font> )
 
<b>by </b><i><a class="ref" href="cqc_the1.html#D10" target="_self" title="CQC_THE1:def.10">Def10</a></i>;<br/>
<b>hence </b><a NAME="E2:66"/>
( <font color="Maroon" title="c1">s</font> is <a href="cqc_the1.html#V2" title="CQC_THE1:attr.2">valid</a> iff <font color="Maroon" title="c1">s</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="cqc_the1.html#K4" title="CQC_THE1:func.4">TAUT</a>  )
 <b>by </b><i><a class="ref" href="cqc_the1.html#D9" target="_self" title="CQC_THE1:def.9">Def9</a></i>; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


</div>
