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<b>set </b><font color="Maroon">AR</font> = <font color="Maroon">L</font> <a href="waybel_4.html#K1" target="_self">-waybelow</a> ;<br/>
<b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">z</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">u</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel_4.html#D5" target="_self">WAYBEL_4:def 5</a><br/>

<b>assume </b><a NAME="E1:89_1_1"/>
( <font color="Maroon">u</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">x</font> &amp; <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">x</font>,<font color="Maroon">y</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">L</font> <a href="waybel_4.html#K1" target="_self">-waybelow</a>  &amp; <font color="Maroon">y</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">z</font> )
 ;<br/>

<a NAME="E2:89_1_1"/><b>then </b>
( <font color="Maroon">u</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">x</font> &amp; <font color="Maroon">x</font> <a href="waybel_3.html#NR2" target="_self">&lt;&lt;</a> <font color="Maroon">y</font> &amp; <font color="Maroon">y</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">z</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E3:89_1_1"/><b>then </b>
<font color="Maroon">u</font> <a href="waybel_3.html#NR2" target="_self">&lt;&lt;</a> <font color="Maroon">z</font>
 
<b>by </b><i><a class="ref" href="waybel_3.html#T2">WAYBEL_3:2</a></i>;<br/>
<b>hence </b><a NAME="E4:89_1_1"/>
<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">u</font>,<font color="Maroon">z</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a> <font color="Maroon">L</font> <a href="waybel_4.html#K1" target="_self">-waybelow</a> 
 <b>by </b><i/>;<br/>


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