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<div><span class="kw">theorem </span><a NAME="T30"><span class="comment"><font color="firebrick">:: ORDINAL1:30</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">Z</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds   <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is   <a href="ordinal1.html#NM5" title="ORDINAL1:NM.5">Sequence</a> of <font color="Olive" title="b1">Z</font></div></div>
