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<div><span class="kw">theorem </span><a NAME="T21"><span class="comment"><font color="firebrick">:: EXCHSORT:21</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">f</font> being   <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a> holds  <font color="Olive" title="b1">f</font> is  <a href="exchsort.html#K1" title="EXCHSORT:func.1">base-</a> <font color="Olive" title="b1">f</font> <a href="exchsort.html#V2" title="EXCHSORT:attr.2">-based</a> </div></div>
