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<a NAME="E1:29_1_1"/>
 <a href="qc_lang1.html#K9" title="QC_LANG1:func.9">QC-WFF</a> <font color="Maroon" title="c1">A</font> is <font color="Maroon" title="c1">A</font> <a href="qc_lang1.html#V1" title="QC_LANG1:attr.1">-closed</a> 
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="qc_lang1.html#D11" target="_self" onmouseover="rs('qc_lang1/D11')" onmouseout="rh()">Def11</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:29_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> is <font color="Maroon" title="c1">A</font> <a href="qc_lang1.html#V1" title="QC_LANG1:attr.1">-closed</a>  &amp;  not <font color="Olive">b<sub>1</sub></font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )
 ; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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