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<b>let </b><font color="Maroon">L1</font> be    <a href="orders_2.html#L1">RelStr</a> , <font color="Maroon">L2</font> be    <a href="orders_2.html#L1">RelStr</a> ;<br/>

<b>assume </b><a NAME="E1:56"/><i><font color="Green">E28</font></i>: 
 <a href="orders_2.html#G1">RelStr</a>(# the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">L1</font>,the <a href="orders_2.html#U1">InternalRel</a> of <font color="Maroon">L1</font> #) <a href="hidden.html#R1">=</a>  <a href="orders_2.html#G1">RelStr</a>(# the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">L2</font>,the <a href="orders_2.html#U1">InternalRel</a> of <font color="Maroon">L2</font> #)
 ;<br/>

<b>let </b><font color="Maroon">X1</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">L1</font>;<br/><b>let </b><font color="Maroon">X2</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">L2</font>;<br/>



<b>assume </b><a NAME="E2:56"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">X1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X2</font>
 ;<br/>

<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:56_1"/>
<font color="Maroon">X1</font> is <a href="waybel_0.html#V12" target="_self">lower</a>
 ;<br/><a NAME="E2:56_1"/><b>then </b>
(  <a href="waybel_0.html#K3" target="_self">downarrow</a> <font color="Maroon">X1</font> <a href="hidden.html#R1">=</a>  <a href="waybel_0.html#K3" target="_self">downarrow</a> <font color="Maroon">X2</font> &amp;  <a href="waybel_0.html#K3" target="_self">downarrow</a> <font color="Maroon">X1</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X1</font> )
 <b>by </b><i>, <a class="txt" href="waybel_0.html#E2:56"><i><font color="Green">E30</font></i></a>, , </i>;<br/><b>hence </b><a NAME="E3:56_1"/>
<font color="Maroon">X2</font> is <a href="waybel_0.html#V12" target="_self">lower</a>
 <b>by </b><i><a class="txt" href="waybel_0.html#E2:56"><i><font color="Green">E30</font></i></a>, </i>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E4:56"/>
<font color="Maroon">X1</font> is <a href="waybel_0.html#V13" target="_self">upper</a>
 ;<br/>

<a NAME="E5:56"/><b>then </b>
(  <a href="waybel_0.html#K4" target="_self">uparrow</a> <font color="Maroon">X1</font> <a href="hidden.html#R1">=</a>  <a href="waybel_0.html#K4" target="_self">uparrow</a> <font color="Maroon">X2</font> &amp;  <a href="waybel_0.html#K4" target="_self">uparrow</a> <font color="Maroon">X1</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X1</font> )
 
<b>by </b><i>, <a class="txt" href="waybel_0.html#E2:56"><i><font color="Green">E30</font></i></a>, , <a class="txt" href="waybel_0.html#E1:56"><i><font color="Green">E28</font></i></a></i>;<br/>
<b>hence </b><a NAME="E6:56"/>
<font color="Maroon">X2</font> is <a href="waybel_0.html#V13" target="_self">upper</a>
 <b>by </b><i><a class="txt" href="waybel_0.html#E2:56"><i><font color="Green">E30</font></i></a>, <a class="txt" href="waybel_0.html#E1:56"><i><font color="Green">E28</font></i></a></i>;<br/>


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