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

<a NAME="E1:63_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">c<sub>2</sub></font> <a href="tarski.html#R1">c=</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T17">XBOOLE_1:17</a></i>;<br/>
<b>hence </b><a NAME="E2:63_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">c<sub>2</sub></font> is <a href="membered.html#V5" target="_self">natural-membered</a>
 <b>by </b><i><a class="ref" href="membered.html#T20" target="_self">Th20</a></i>;<br/>


</div>
