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<div><span class="kw">theorem </span><a NAME="T31"><span class="comment"><font color="firebrick">:: QC_LANG3:31</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> <br/>  for <font color="Olive" title="b2">a</font> being   <a href="qc_lang1.html#NM7" title="QC_LANG1:NM.7">free_QC-variable</a> of <font color="Olive" title="b1">A</font>  ex <font color="Olive" title="b3">i</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a> st <font color="Olive" title="b1">A</font> <a href="qc_lang3.html#K3" title="QC_LANG3:func.3">a.</a> <font color="Olive" title="b3">i</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b2">a</font></div></div>
