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<div><span class="kw">theorem </span><a NAME="T20"><span class="comment"><font color="firebrick">:: QC_LANG3:20</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">A</font> being    <a href="qc_lang1.html#M1" title="QC_LANG1:mode.1">QC-alphabet</a>  holds <br/> (  <a href="qc_lang1.html#K12" title="QC_LANG1:func.12">VERUM</a> <font color="Olive" title="b1">A</font> is  <a href="qc_lang1.html#V6" title="QC_LANG1:attr.6">closed</a>  &amp;  <a href="qc_lang2.html#K1" title="QC_LANG2:func.1">FALSUM</a> <font color="Olive" title="b1">A</font> is  <a href="qc_lang1.html#V6" title="QC_LANG1:attr.6">closed</a>  ) <span class="kw">by</span> <span class="lab"><a class="ref" href="qc_lang3.html#T3" target="_self" onmouseover="rs('qc_lang3/T3')" onmouseout="rh()">Th3</a>, <a class="ref" href="qc_lang3.html#T8" target="_self" onmouseover="rs('qc_lang3/T8')" onmouseout="rh()">Th8</a></span>;<br/></div></div>
