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<b>let </b><font color="Maroon" title="c1">E</font> be  <a href="struct_0.html#V3" title="STRUCT_0:attr.3">empty</a> <a href="altcat_1.html#V6" title="ALTCAT_1:attr.6">strict</a>  <a href="altcat_1.html#L2" title="ALTCAT_1:struct.2">AltCatStr</a> ;<br/>

<a NAME="E1:45"/>
( the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c1">E</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> &amp; the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <a href="altcat_2.html#K7" title="ALTCAT_2:func.7">the_empty_category</a>  is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> )
 
<b>by </b><i><a class="ref" href="struct_0.html#D1" title="STRUCT_0:def.1">STRUCT_0:def 1</a></i>;<br/>
<b>hence </b><a NAME="E2:45"/>
<font color="Maroon" title="c1">E</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="altcat_2.html#K7" title="ALTCAT_2:func.7">the_empty_category</a> 
 <b>by </b><i><a class="txt" href="altcat_2.html#E29"><i><font color="Green" title="E18">Lm1</font></i></a></i>;<br/>


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