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<div><span class="kw">theorem </span><a NAME="T67"><span class="comment"><font color="firebrick">:: CARDFIL2:67</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><font color="Olive" title="b1">X</font></span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> is    <a href="card_fil.html#M1" title="CARD_FIL:mode.1">Filter</a> of <font color="Olive" title="b1">X</font> <span class="kw">by</span> <span class="lab"><a class="ref" href="card_fil.html#T4" onmouseover="rs('card_fil/T4')" onmouseout="rh()">CARD_FIL:4</a></span>;<br/></div></div>
