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<b>consider </b><font color="Maroon" title="c1">O</font>, <font color="Maroon" title="c2">A</font> being  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>
<a NAME="E2:3_1_1"/>
(  <a href="struct_0.html#G5" title="STRUCT_0:aggr.5">2-sorted</a>(# <font color="Maroon" title="c1">O</font>,<font color="Maroon" title="c2">A</font> #) is <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> &amp;  <a href="struct_0.html#G5" title="STRUCT_0:aggr.5">2-sorted</a>(# <font color="Maroon" title="c1">O</font>,<font color="Maroon" title="c2">A</font> #) is <a href="struct_0.html#V11" title="STRUCT_0:attr.11">void</a> &amp;  <a href="struct_0.html#G5" title="STRUCT_0:aggr.5">2-sorted</a>(# <font color="Maroon" title="c1">O</font>,<font color="Maroon" title="c2">A</font> #) is <a href="conlat_1.html#V1" title="CONLAT_1:attr.1">quasi-empty</a> )
 
<b>by </b><i><a class="ref" href="conlat_1.html#D2" target="_self" title="CONLAT_1:def.2">Def2</a></i>;<br/>
<b>hence </b><a NAME="E3:3_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being   <a href="struct_0.html#L5" title="STRUCT_0:struct.5">2-sorted</a>  st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="struct_0.html#V10" title="STRUCT_0:attr.10">strict</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="struct_0.html#V11" title="STRUCT_0:attr.11">void</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="conlat_1.html#V1" title="CONLAT_1:attr.1">quasi-empty</a> )
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><i><font color="Red">::  thesis: </font></i></a><span class="hide"> verum</span><br/>


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