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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E36">Th53</font></span>: <a NAME="T53"><span class="comment"><font color="firebrick">:: CLASSES2:53</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="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Olive" title="b2">U2</font> or <font color="Olive" title="b2">U2</font> <a href="tarski.html#R2" title="TARSKI:pred.2">in</a> <font color="Olive" title="b1">U1</font> )</div></div>
