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

<b>let </b><font color="Maroon">FT</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="orders_2.html#L1">RelStr</a> ;<br/><b>let </b><font color="Maroon">A</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">FT</font>, <font color="Maroon">B</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">FT</font>;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:52"/><i><font color="Green">E27</font></i>: 
( <font color="Maroon">FT</font> is <a href="fin_topo.html#V1">filled</a> &amp; <font color="Maroon">FT</font> is <a href="fin_topo.html#V2">symmetric</a> &amp; <font color="Maroon">A</font> <a href="fintopo6.html#R1" target="_self">is_a_component_of</a> <font color="Maroon">FT</font> )
 <b>and </b><br/><a NAME="E2:52"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">B</font> <a href="fintopo6.html#R1" target="_self">is_a_component_of</a> <font color="Maroon">FT</font>
 ;<br/>

<a NAME="E3:52"/>
( <font color="Maroon">A</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">B</font> implies <font color="Maroon">A</font>,<font color="Maroon">B</font> <a href="fintopo4.html#R1">are_separated</a>  )
 
<b>by </b><i>, , <a class="ref" href="fintopo6.html#T1" target="_self">Th1</a></i>;<br/>
<b>hence </b><a NAME="E4:52"/>
( <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <font color="Maroon">B</font> or <font color="Maroon">A</font> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">B</font> )
 <b>by </b><i><a class="ref" href="fintopo4.html#T6">FINTOPO4:6</a>, </i>;<br/>


</div>
