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<b>let </b><font color="Maroon">A</font> be  non <a href="struct_0.html#V3">empty</a> <a href="orders_2.html#NM1">Poset</a>;<br/><b>let </b><font color="Maroon">f</font> be    <a href="orders_1.html#M1">Choice_Function</a> of  <a href="orders_1.html#K1">BOOL</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">A</font>;<br/><b>let </b><font color="Maroon">fC1</font> be    <a href="orders_2.html#M2" target="_self">Chain</a> of <font color="Maroon">f</font>;<br/><b>let </b><font color="Maroon">fC2</font> be    <a href="orders_2.html#M2" target="_self">Chain</a> of <font color="Maroon">f</font>;<br/>







<a NAME="E1:60"/>
( <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">fC1</font> &amp; <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">fC2</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:60"/>
<font color="Maroon">fC1</font> <a href="xboole_0.html#NR5" target="_self">meets</a> <font color="Maroon">fC2</font>
 <b>by </b><i><a class="ref" href="xboole_0.html#T3">XBOOLE_0:3</a></i>;<br/>


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