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<b>let </b><font color="Maroon">L</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="orders_2.html#L1">RelStr</a> ;<br/>

<b>take </b><font color="Maroon">g</font> =  <a href="grcat_1.html#K7">id</a> <font color="Maroon">L</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel_1.html#D10">WAYBEL_1:def 10</a><br/>

<b>take </b><font color="Maroon">d</font> =  <a href="grcat_1.html#K7">id</a> <font color="Maroon">L</font>;<br/>

<b>thus </b><a NAME="E1:16"/>
( <span class="p1"><a href="waybel_1.html#K1">[</a><span class="default"><span class="p2">(<span class="default"><a href="grcat_1.html#K7">id</a> <font color="Maroon">L</font></span>)</span>,<span class="p2">(<span class="default"><a href="grcat_1.html#K7">id</a> <font color="Maroon">L</font></span>)</span></span><a href="waybel_1.html#K1">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="waybel_1.html#K1">[</a><span class="default"><font color="Maroon">g</font>,<font color="Maroon">d</font></span><a href="waybel_1.html#K1">]</a></span> &amp; <font color="Maroon">g</font> is <a href="orders_3.html#V5">monotone</a> &amp; <font color="Maroon">d</font> is <a href="orders_3.html#V5">monotone</a> )
 ;<br/>

<b>let </b><font color="Maroon">t</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">s</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>

<a NAME="E2:16"/>
( <font color="Maroon">g</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">s</font> <a href="hidden.html#R1">=</a> <font color="Maroon">s</font> &amp; <font color="Maroon">d</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t</font> <a href="hidden.html#R1">=</a> <font color="Maroon">t</font> )
 
<b>by </b><i><a class="ref" href="funct_1.html#T35">FUNCT_1:35</a></i>;<br/>
<b>hence </b><a NAME="E3:16"/>
( (  not <font color="Maroon">t</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">g</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">s</font> or <font color="Maroon">d</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">s</font> ) &amp; (  not <font color="Maroon">d</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">t</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">s</font> or <font color="Maroon">t</font> <a href="orders_2.html#R1">&lt;=</a> <font color="Maroon">g</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">s</font> ) )
 ;<br/>


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