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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E22">Th21</font></span>: <a NAME="T21"><span class="comment"><font color="firebrick">:: REWRITE1:21</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">R</font> being   <a href="relat_1.html#NM1" title="RELAT_1:NM.1">Relation</a><br/>  for <font color="Olive" title="b2">a</font>, <font color="Olive" title="b3">b</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">object</a>  holds <br/> ( <font color="Olive" title="b1">R</font> <a href="rewrite1.html#R1" title="REWRITE1:pred.1">reduces</a> <font color="Olive" title="b2">a</font>,<font color="Olive" title="b3">b</font> iff <font color="Olive" title="b1">R</font> <a href="finseq_1.html#K18" title="FINSEQ_1:func.18">[*]</a>  <a href="rewrite1.html#R1" title="REWRITE1:pred.1">reduces</a> <font color="Olive" title="b2">a</font>,<font color="Olive" title="b3">b</font> )</div></div>
