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<b>let </b><font color="Maroon">L</font> be    <a href="orders_2.html#L1">RelStr</a> , <font color="Maroon">R</font> be    <a href="orders_2.html#L1">RelStr</a> ;<br/><b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="waybel10.html#K4" target="_self">Sub</a> <font color="Maroon">L</font></span>)</span>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="waybel10.html#K4" target="_self">Sub</a> <font color="Maroon">L</font></span>)</span>;<br/>



<a NAME="E1:31"/>
( <font color="Maroon">x</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">y</font> iff  ex <font color="Olive">R</font> being   <a href="orders_2.html#L1">RelStr</a>  st <br/>( <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <font color="Olive">R</font> &amp; <font color="Maroon">x</font> is    <a href="yellow_0.html#M1">SubRelStr</a> of <font color="Olive">R</font> ) )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:31"/>
( <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">R</font> implies ( <font color="Maroon">x</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">y</font> iff <font color="Maroon">x</font> is    <a href="yellow_0.html#M1">SubRelStr</a> of <font color="Maroon">R</font> ) )
 ;<br/>


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