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<b>consider </b><font color="Maroon">x</font> being    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">X</font>;<br/>
<b>reconsider </b><font color="Maroon">x'</font> = <font color="Maroon">x</font> as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> ;<br/>
<a NAME="E3:42_1_1"/>
<font color="Maroon">x'</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">x'</font>
 
;<br/>
<b>hence </b><a NAME="E4:42_1_1"/>
not  <a href="waybel_0.html#K3" target="_self">downarrow</a> <font color="Maroon">X</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i/>;<br/>


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