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

<a NAME="E1:9_1_1"/>
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">F</font> <a href="hidden.html#R1">=</a> <font color="Maroon">I</font>
 
<b>by </b><i><a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>
<a NAME="E2:9_1_1"/><b>then </b>
<font color="Maroon">F</font> <a href="pralg_1.html#K10">.</a> <font color="Maroon">i</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">F</font>
 
<b>by </b><i><a class="ref" href="funct_1.html#D5">FUNCT_1:def 5</a></i>;<br/>
<b>hence </b><a NAME="E3:9_1_1"/>
<font color="Maroon">F</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">i</font> is  non <a href="struct_0.html#V3">empty</a>  <a href="group_1.html#L1">HGrStr</a> 
 <b>by </b><i/>;<br/>


</div>
