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<div><span class="kw">theorem </span><a NAME="T55"><span class="comment"><font color="firebrick">:: CARDFIL2:55</font></span><br/></a><div class="add"> <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  <a href="tarski.html#R2" title="TARSKI:pred.2">in</a>  <a href="cardfil2.html#K11" title="CARDFIL2:func.11">base_of_frechet_filter</a> </div></div>
