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

<b>consider </b><font color="Maroon">y</font> being    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>()<b> such that </b><br/><a NAME="E2:3_1"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">F<sub>2</sub></font>() <a href="hidden.html#R1">=</a> <font color="Maroon">y</font>
 <b>and </b><br/><a NAME="E3:3_1"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">y</font>]
 <b>by </b><i/>;<br/>
<b>thus </b><a NAME="E4:3_1"/>
<font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">F<sub>2</sub></font>()]
 <b>by </b><i>, </i>;<br/>


</div>
