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<div><span class="kw">theorem </span><a NAME="T55"><span class="comment"><font color="firebrick">:: CLASSES2:55</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">U1</font>, <font color="Olive" title="b2">U2</font> being   <a href="classes2.html#NM1" title="CLASSES2:NM.1">Universe</a> holds <br/> ( <font color="Olive" title="b1">U1</font> <a href="xboole_0.html#K2" title="XBOOLE_0:func.2">\/</a> <font color="Olive" title="b2">U2</font> is   <a href="classes2.html#NM1" title="CLASSES2:NM.1">Universe</a> &amp; <font color="Olive" title="b1">U1</font> <a href="xboole_0.html#K3" title="XBOOLE_0:func.3">/\</a> <font color="Olive" title="b2">U2</font> is   <a href="classes2.html#NM1" title="CLASSES2:NM.1">Universe</a> )</div></div>
