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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="struct_0.html#V3">empty</a> <a href="altcat_1.html#V6">strict</a>  <a href="altcat_1.html#L2">AltCatStr</a> ;<br/>

<a NAME="E1:45"/>
( the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">c<sub>1</sub></font> is <a href="xboole_0.html#V1">empty</a> &amp; the <a href="struct_0.html#U1">carrier</a> of <a href="altcat_2.html#K7" target="_self">the_empty_category</a>  is <a href="xboole_0.html#V1">empty</a> )
 
<b>by </b><i><a class="ref" href="struct_0.html#D1">STRUCT_0:def 1</a></i>;<br/>
<b>hence </b><a NAME="E2:45"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="altcat_2.html#K7" target="_self">the_empty_category</a> 
 <b>by </b><i><a class="txt" href="altcat_2.html#E29"><i><font color="Green">Lemma18</font></i></a></i>;<br/>


</div>
