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<a NAME="E1:14_1_1"/><i><font color="Green">E41</font></i>: 
 <a href="relat_1.html#K3">field</a> <font color="Maroon">R</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font>
 
<b>by </b><i><a class="ref" href="orders_1.html#T100">ORDERS_1:100</a></i>;<br/>
<a NAME="E2:14_1_1"/>
<font color="Maroon">R</font> <a href="orders_1.html#R3">linearly_orders</a>  <a href="relat_1.html#K3">field</a> <font color="Maroon">R</font>
 
<b>by </b><i><a class="ref" href="orders_1.html#T133">ORDERS_1:133</a></i>;<br/>
<a NAME="E3:14_1_1"/><b>then </b>
<font color="Maroon">R</font> <a href="orders_1.html#R3">linearly_orders</a> <font color="Maroon">A</font>
 
<b>by </b><i>, <a class="ref" href="orders_1.html#T134">ORDERS_1:134</a></i>;<br/>
<b>hence </b><a NAME="E4:14_1_1"/>
( not  <a href="triang_1.html#K2">SgmX</a> <font color="Maroon">R</font>,<font color="Maroon">A</font> is <a href="xboole_0.html#V1">empty</a> &amp;  <a href="triang_1.html#K2">SgmX</a> <font color="Maroon">R</font>,<font color="Maroon">A</font> is <a href="funct_1.html#V2">one-to-one</a> )
 <b>by </b><i><a class="ref" href="relat_1.html#T60">RELAT_1:60</a>, <a class="ref" href="triang_1.html#T8">TRIANG_1:8</a>, <a class="ref" href="triang_1.html#D2">TRIANG_1:def 2</a></i>;<br/>


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