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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="classes2.html#NM1">Universe</a>;<br/>

<a NAME="E1:40"/><i><font color="Green">E25</font></i>: 
 <a href="xboole_0.html#K1">{}</a>  is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="classes2.html#T62">CLASSES2:62</a></i>;<br/>
<b>thus </b><a NAME="E2:40"/>
0 is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="classes2.html#T62">CLASSES2:62</a></i>;<br/>

<a NAME="E3:40"/>
1 <a href="hidden.html#R1">=</a>  <a href="ordinal1.html#K1">succ</a> 0
 
;<br/>
<b>hence </b><a NAME="E4:40"/>
1 is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="mod_2.html#E1:40"><i><font color="Green">E25</font></i></a>, <a class="ref" href="mod_2.html#T29" target="_self">Th29</a></i>;<br/>

<b>hence </b><a NAME="E5:40"/>
2 is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="mod_2.html#T29" target="_self">Th29</a>, <a class="ref" href="card_2.html#T22">CARD_2:22</a></i>;<br/>


</div>
