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

<b>let </b><font color="Maroon">C</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">o1</font> be   <a href="altcat_1.html#NM1">object</a> of <span class="p1">(<span class="default"><a href="altcat_2.html#K6" target="_self">Alter</a> <font color="Maroon">C</font></span>)</span>, <font color="Maroon">o2</font> be   <a href="altcat_1.html#NM1">object</a> of <span class="p1">(<span class="default"><a href="altcat_2.html#K6" target="_self">Alter</a> <font color="Maroon">C</font></span>)</span>, <font color="Maroon">o3</font> be   <a href="altcat_1.html#NM1">object</a> of <span class="p1">(<span class="default"><a href="altcat_2.html#K6" target="_self">Alter</a> <font color="Maroon">C</font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="altcat_1.html#D4">ALTCAT_1:def 4</a><br/>



<b>assume </b><a NAME="E1:31"/><i><font color="Green">E16</font></i>: 
( <span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o1</font>,<font color="Maroon">o2</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  &amp; <span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o2</font>,<font color="Maroon">o3</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a>  )
 ;<br/>

<b>reconsider </b><font color="Maroon">x1</font> = <font color="Maroon">o1</font>, <font color="Maroon">x2</font> = <font color="Maroon">o2</font>, <font color="Maroon">x3</font> = <font color="Maroon">o3</font> as   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">C</font> ;<br/>
<a NAME="E3:31"/><i><font color="Green">E17</font></i>: 
<span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o1</font>,<font color="Maroon">o2</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K6">Hom</a> <font color="Maroon">x1</font>,<font color="Maroon">x2</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:31"/><i><font color="Green">E20</font></i>: 
<span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o2</font>,<font color="Maroon">o3</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K6">Hom</a> <font color="Maroon">x2</font>,<font color="Maroon">x3</font>
 
<b>by </b><i/>;<br/>
<a NAME="E5:31"/>
<span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o1</font>,<font color="Maroon">o3</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K6">Hom</a> <font color="Maroon">x1</font>,<font color="Maroon">x3</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:31"/>
<span class="p1"><a href="altcat_1.html#K1">&lt;^</a><span class="default"><font color="Maroon">o1</font>,<font color="Maroon">o3</font></span><a href="altcat_1.html#K1">^&gt;</a></span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="xboole_0.html#K1">{}</a> 
 <b>by </b><i><a class="txt" href="altcat_2.html#E1:31"><i><font color="Green">E16</font></i></a>, <a class="txt" href="altcat_2.html#E3:31"><i><font color="Green">E17</font></i></a>, , <a class="ref" href="cat_1.html#T52">CAT_1:52</a></i>;<br/>


</div>
