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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E27">Th29</font></span>: <a NAME="T29"><span class="comment"><font color="firebrick">:: TOPGEN_4:29</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">F</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds   <a href="setfam_1.html#K2" title="SETFAM_1:func.2">UNION</a> (<a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>,<font color="Olive" title="b1">F</font>) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </div></div>
