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<div><span class="kw">theorem </span><a NAME="T12"><span class="comment"><font color="firebrick">:: FINSEQ_9:12</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">f</font> being   <a href="relat_1.html#NM1" title="RELAT_1:NM.1">Relation</a> holds <br/> (  <a href="relat_1.html#NK1" title="RELAT_1:NK.1">dom</a> <font color="Olive" title="b1">f</font> is  <a href="membered.html#V4" title="MEMBERED:attr.4">rational-membered</a>  iff <font color="Olive" title="b1">f</font> is  <a href="numbers.html#K3" title="NUMBERS:func.3">RAT</a>  <a href="relat_1.html#V4" title="RELAT_1:attr.4">-defined</a>  )</div></div>
