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<b>let </b><font color="Maroon" title="c1">P1</font>, <font color="Maroon" title="c2">P2</font> be    <a href="orders_2.html#L1" title="ORDERS_2:struct.1">RelStr</a> ;<br/>

<b>assume </b><b>that </b><br/><a NAME="E1:9"/><i><font color="Green" title="E3">A1</font></i>: 
 <a href="orders_2.html#G1" title="ORDERS_2:aggr.1">RelStr</a>(# the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c1">P1</font>,the <a href="orders_2.html#U1" title="ORDERS_2:sel.1">InternalRel</a> of <font color="Maroon" title="c1">P1</font> #) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="orders_2.html#G1" title="ORDERS_2:aggr.1">RelStr</a>(# the <a href="struct_0.html#U1" title="STRUCT_0:sel.1">carrier</a> of <font color="Maroon" title="c2">P2</font>,the <a href="orders_2.html#U1" title="ORDERS_2:sel.1">InternalRel</a> of <font color="Maroon" title="c2">P2</font> #)
 <b>and </b><br/><a NAME="E2:9"/><i><font color="Green" title="E4">A2</font></i>: 
for <font color="Olive" title="b1">X</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>   ex <font color="Olive" title="b2">a</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">P1</font> st <br/>( <font color="Olive" title="b1">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Olive" title="b2">a</font> &amp; ( for <font color="Olive" title="b3">b</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">P1</font>  st <font color="Olive" title="b1">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Olive" title="b3">b</font> holds <br/><font color="Olive" title="b2">a</font> <a href="orders_2.html#R1" title="ORDERS_2:pred.1">&lt;=</a> <font color="Olive" title="b3">b</font> ) )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="lattice3.html#D12" title="LATTICE3:def.12">LATTICE3:def 12</a><br/>

<b>let </b><font color="Maroon" title="c3">X</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="lattice3.html#D12" title="LATTICE3:def.12">LATTICE3:def 12</a><br/>

<b>consider </b><font color="Maroon" title="c4">a</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">P1</font><b> such that </b><br/><a NAME="E4:9"/><i><font color="Green" title="E5">A3</font></i>: 
<font color="Maroon" title="c3">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Maroon" title="c4">a</font>
 <b>and </b><br/><a NAME="E5:9"/><i><font color="Green" title="E6">A4</font></i>: 
for <font color="Olive" title="b1">b</font> being  <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">P1</font>  st <font color="Maroon" title="c3">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Olive" title="b1">b</font> holds <br/><font color="Maroon" title="c4">a</font> <a href="orders_2.html#R1" title="ORDERS_2:pred.1">&lt;=</a> <font color="Olive" title="b1">b</font>
 <b>by </b><i><a class="txt" href="yellow_0.html#E2:9"><i><font color="Green" title="E4">A2</font></i></a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c5">a'</font> = <font color="Maroon" title="c4">a</font> as   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c2">P2</font> <b>by </b><i><a class="txt" href="yellow_0.html#E1:9"><i><font color="Green" title="E3">A1</font></i></a></i>;<br/>
<b>take </b>
<font color="Maroon" title="c5">a'</font>
;<br/>

<b>thus </b><a NAME="E7:9"/>
<font color="Maroon" title="c3">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Maroon" title="c5">a'</font>
 <b>by </b><i><a class="txt" href="yellow_0.html#E1:9"><i><font color="Green" title="E3">A1</font></i></a>, <a class="txt" href="yellow_0.html#E4:9"><i><font color="Green" title="E5">A3</font></i></a>, <a class="ref" href="yellow_0.html#T2" target="_self" title="YELLOW_0:th.2">Th2</a></i>;<br/>

<b>let </b><font color="Maroon" title="c6">b'</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c2">P2</font>;<br/>

<b>reconsider </b><font color="Maroon" title="c7">b</font> = <font color="Maroon" title="c6">b'</font> as   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">P1</font> <b>by </b><i><a class="txt" href="yellow_0.html#E1:9"><i><font color="Green" title="E3">A1</font></i></a></i>;<br/>
<b>assume </b><a NAME="E9:9"/>
<font color="Maroon" title="c3">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Maroon" title="c6">b'</font>
 ;<br/>

<a NAME="E10:9"/><b>then </b>
<font color="Maroon" title="c3">X</font> <a href="lattice3.html#R2" title="LATTICE3:pred.2">is_&lt;=_than</a> <font color="Maroon" title="c7">b</font>
 
<b>by </b><i><a class="txt" href="yellow_0.html#E1:9"><i><font color="Green" title="E3">A1</font></i></a>, <a class="ref" href="yellow_0.html#T2" target="_self" title="YELLOW_0:th.2">Th2</a></i>;<br/>
<a NAME="E11:9"/><b>then </b>
<font color="Maroon" title="c4">a</font> <a href="orders_2.html#R1" title="ORDERS_2:pred.1">&lt;=</a> <font color="Maroon" title="c7">b</font>
 
<b>by </b><i><a class="txt" href="yellow_0.html#E5:9"><i><font color="Green" title="E6">A4</font></i></a></i>;<br/>
<b>hence </b><a NAME="E12:9"/>
<font color="Maroon" title="c5">a'</font> <a href="orders_2.html#R1" title="ORDERS_2:pred.1">&lt;=</a> <font color="Maroon" title="c6">b'</font>
 <b>by </b><i><a class="txt" href="yellow_0.html#E1:9"><i><font color="Green" title="E3">A1</font></i></a>, <a class="ref" href="yellow_0.html#T1" target="_self" title="YELLOW_0:th.1">Th1</a></i>;<br/>


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