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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E14">Th18</font></span>: <a NAME="T18"><span class="comment"><font color="firebrick">:: CARD_3:18</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">object</a> <br/>  for <font color="Olive" title="b2">X</font>, <font color="Olive" title="b3">Y</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a>  holds  <span class="p1">(<span class="default"><a href="card_3.html#K5" title="CARD_3:func.5">pi</a> (<font color="Olive" title="b2">X</font>,<font color="Olive" title="b1">x</font>)</span>)</span> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <span class="p1">(<span class="default"><a href="card_3.html#K5" title="CARD_3:func.5">pi</a> (<font color="Olive" title="b3">Y</font>,<font color="Olive" title="b1">x</font>)</span>)</span> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="card_3.html#K5" title="CARD_3:func.5">pi</a> (<span class="p1">(<span class="default"><font color="Olive" title="b2">X</font> <a href="subset_1.html#K6" title="SUBSET_1:func.6">\</a> <font color="Olive" title="b3">Y</font></span>)</span>,<font color="Olive" title="b1">x</font>)</div></div>
