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<b>take </b>
 <a href="yellow_1.html#K3" title="YELLOW_1:func.3">BoolePoset</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> 
;<br/>

<b>thus </b><a NAME="E1:21_1_1"/>
( not  <a href="yellow_1.html#K3" title="YELLOW_1:func.3">BoolePoset</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a> &amp;  <a href="yellow_1.html#K3" title="YELLOW_1:func.3">BoolePoset</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is <a href="waybel_0.html#V7" title="WAYBEL_0:attr.7">directed</a> &amp;  <a href="yellow_1.html#K3" title="YELLOW_1:func.3">BoolePoset</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is <a href="orders_2.html#V4" title="ORDERS_2:attr.4">transitive</a> &amp;  <a href="yellow_1.html#K3" title="YELLOW_1:func.3">BoolePoset</a> <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a>  is <a href="orders_2.html#V1" title="ORDERS_2:attr.1">strict</a> )
 ;<br/>


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