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

<b>let </b><font color="Maroon">C</font> be   <a href="altcat_1.html#NM4">category</a>;<br/><b>let </b><font color="Maroon">o1</font> be   <a href="altcat_1.html#NM1">object</a> of <font color="Maroon">C</font>, <font color="Maroon">o2</font> be   <a href="altcat_1.html#NM1">object</a> of <font color="Maroon">C</font>;<br/>



<b>assume </b><a NAME="E1:49"/>
( <font color="Maroon">o1</font> is <a href="altcat_3.html#V8" target="_self">_zero</a> &amp; <font color="Maroon">o2</font> is <a href="altcat_3.html#V8" target="_self">_zero</a> )
 ;<br/>

<a NAME="E2:49"/><b>then </b>
( <font color="Maroon">o1</font> is <a href="altcat_3.html#V6" target="_self">initial</a> &amp; <font color="Maroon">o2</font> is <a href="altcat_3.html#V6" target="_self">initial</a> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:49"/>
<font color="Maroon">o1</font>,<font color="Maroon">o2</font> <a href="altcat_3.html#R2" target="_self">are_iso</a> 
 <b>by </b><i/>;<br/>


</div>
