<?xml version="1.0"?>
<div class="add">

<a NAME="E1:65_1_1"/>
not  <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K5">rng</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="ref" href="setfam_1.html#D9">SETFAM_1:def 9</a></i>;<br/>
<b>hence </b><a NAME="E2:65_1_1"/>
not  <a href="card_3.html#K4" target="_self">product</a> <font color="Maroon">f</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i/>;<br/>


</div>
