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

<b>reconsider </b><font color="Maroon">c<sub>1</sub></font> =  <a href="subset_1.html#K1">{}</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<a href="xboole_0.html#K1">{}</a> </span><a href="zfmisc_1.html#K2">:]</a></span> as   <a href="relset_1.html#NM3">Relation</a> of  <a href="xboole_0.html#K1">{}</a>  <b>by </b><i><a class="ref" href="relset_1.html#T25">RELSET_1:25</a></i>;<br/>
<a NAME="E2:12_1_1"/>
 <a href="orders_2.html#G1">RelStr</a>(# <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">c<sub>1</sub></font> #) <a href="hidden.html#R2">in</a>  <a href="neckla_2.html#K3" target="_self">fin_RelStr</a> 
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="12_1_1_1"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>2</sub></font> =  <a href="orders_2.html#G1">RelStr</a>(# <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">c<sub>1</sub></font> #);<br/>
<a NAME="E1:12_1_1_1"/>
the <a href="struct_0.html#U1">carrier</a> of <a href="orders_2.html#G1">RelStr</a>(# <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">c<sub>1</sub></font> #) <a href="hidden.html#R2">in</a>  <a href="classes2.html#K13">FinSETS</a> 
 
<b>by </b><i><a class="ref" href="classes1.html#T5">CLASSES1:5</a>, <a class="ref" href="classes2.html#D2">CLASSES2:def 2</a></i>;<br/>
<b>hence </b><a NAME="E2:12_1_1_1"/>
 <a href="orders_2.html#G1">RelStr</a>(# <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">c<sub>1</sub></font> #) <a href="hidden.html#R2">in</a>  <a href="neckla_2.html#K3" target="_self">fin_RelStr</a> 
 <b>by </b><i><a class="ref" href="neckla_2.html#D4" target="_self">Def4</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E3:12_1_1"/>
not  <a href="neckla_2.html#K3" target="_self">fin_RelStr</a>  is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


</div>
