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<div><span class="kw">theorem </span><a NAME="T30"><span class="comment"><font color="firebrick">:: CLASSES5:30</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">U</font> being   <a href="classes2.html#NM1" title="CLASSES2:NM.1">Universe</a><br/>  for <font color="Olive" title="b2">X</font> being    <a href="classes5.html#M1" title="CLASSES5:mode.1">Set</a> of <font color="Olive" title="b1">U</font> holds  <font color="Olive" title="b1">U</font> <a href="xboole_0.html#K4" title="XBOOLE_0:func.4">\</a> <font color="Olive" title="b2">X</font> is    <a href="classes5.html#M2" title="CLASSES5:mode.2">class</a> of <font color="Olive" title="b1">U</font></div></div>
