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<div><span class="kw">theorem </span><a NAME="T45"><span class="comment"><font color="firebrick">:: CLASSES5:45</font></span><br/></a><div class="add"> ex <font color="Olive" title="b1">X</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  st <br/>(  <a href="tarski.html#K3" title="TARSKI:func.3">union</a> <font color="Olive" title="b1">X</font> is    <a href="classes5.html#M2" title="CLASSES5:mode.2">class</a> of  <a href="classes2.html#K13" title="CLASSES2:func.13">FinSETS</a>  &amp; <font color="Olive" title="b1">X</font> is  not    <a href="classes5.html#M2" title="CLASSES5:mode.2">class</a> of  <a href="classes2.html#K13" title="CLASSES2:func.13">FinSETS</a>  &amp; <font color="Olive" title="b1">X</font> is  not    <a href="classes5.html#M1" title="CLASSES5:mode.1">Set</a> of  <a href="classes2.html#K13" title="CLASSES2:func.13">FinSETS</a>  &amp; <font color="Olive" title="b1">X</font> is    <a href="classes5.html#M1" title="CLASSES5:mode.1">Set</a> of  <a href="classes2.html#K14" title="CLASSES2:func.14">SETS</a>  )</div></div>
