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

<b>assume </b><a NAME="E1:85_1_1"/>
not  <a href="amistd_2.html#K9" target="_self">IncAddr</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">c<sub>5</sub></font> =  <a href="amistd_2.html#K9" target="_self">IncAddr</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font> as  non <a href="xboole_0.html#V1">empty</a> <a href="funct_1.html#NM1">Function</a> ;<br/>
<a NAME="E3:85_1_1"/><i><font color="Green">E50</font></i>: 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 
;<br/>
<a NAME="E4:85_1_1"/>
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><a href="amistd_2.html#K9" target="_self">IncAddr</a> <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="amistd_2.html#D15" target="_self">Def15</a></i>;<br/>
<b>hence </b><a NAME="E5:85_1_1"/>
contradiction
 <b>by </b><i><a class="txt" href="amistd_2.html#E3:85_1_1"><i><font color="Green">E50</font></i></a></i>;<br/>


</div>
