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<div><span class="kw">theorem </span><a NAME="T25"><span class="comment"><font color="firebrick">:: ARYTM_3:25</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">a</font>, <font color="Olive" title="b2">b</font> being   <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a>  <a href="ordinal1.html#NM3" title="ORDINAL1:NM.3">Ordinal</a>  st <font color="Olive" title="b2">b</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  holds <br/> <a href="arytm_3.html#K4" title="ARYTM_3:func.4">RED</a> (<font color="Olive" title="b2">b</font>,<font color="Olive" title="b1">a</font>) <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  <span class="kw">by</span> <span class="lab"><a class="ref" href="arytm_3.html#T18" target="_self" onmouseover="rs('arytm_3/T18')" onmouseout="rh()">Th18</a></span>;<br/></div></div>
