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<b>let </b><font color="Maroon">POS</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="analmetr.html#L1" target="_self">ParOrtStr</a> ;<br/><b>let </b><font color="Maroon">K</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">POS</font>;<br/><b>let </b><font color="Maroon">M</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">POS</font>;<br/>





<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:76_1"/>
<font color="Maroon">K</font> <a href="analmetr.html#R7" target="_self">_|_</a> <font color="Maroon">M</font>
 ;<br/><b>then consider </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font>, <font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font><b> such that </b><br/><a NAME="E3:76_1"/><i><font color="Green">E38</font></i>: 
( <font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font> &amp; <font color="Maroon">K</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> )
 <b>and </b><br/><a NAME="E4:76_1"/><i><font color="Green">E39</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="analmetr.html#R6" target="_self">_|_</a> <font color="Maroon">M</font>
 <b>by </b><i><a class="ref" href="analmetr.html#T10" target="_self">Th10</a></i>;<br/><a NAME="E5:76_1"/>
 ex <font color="Olive">c</font>, <font color="Olive">d</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font> st <br/>( <font color="Olive">c</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Olive">d</font> &amp; <font color="Maroon">M</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Olive">c</font>,<font color="Olive">d</font> &amp; <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="analmetr.html#R4" target="_self">_|_</a> <font color="Olive">c</font>,<font color="Olive">d</font> )
 <b>by </b><i>, <a class="ref" href="analmetr.html#T9" target="_self">Th9</a></i>;<br/><b>hence </b><a NAME="E6:76_1"/>
 ex <font color="Olive">a</font>, <font color="Olive">b</font>, <font color="Olive">c</font>, <font color="Olive">d</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font> st <br/>( <font color="Olive">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Olive">b</font> &amp; <font color="Olive">c</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Olive">d</font> &amp; <font color="Maroon">K</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Olive">a</font>,<font color="Olive">b</font> &amp; <font color="Maroon">M</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Olive">c</font>,<font color="Olive">d</font> &amp; <font color="Olive">a</font>,<font color="Olive">b</font> <a href="analmetr.html#R4" target="_self">_|_</a> <font color="Olive">c</font>,<font color="Olive">d</font> )
 <b>by </b><i><a class="ref" href="analmetr.html#T13" target="_self">Th13</a></i>;<br/></div>
<b>end;</b></div>

<b>given </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font>, <font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font>, <font color="Maroon">c</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font>, <font color="Maroon">d</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">POS</font><b> such that </b><a NAME="E2:76"/><i><font color="Green">E46</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font>
 <b>and </b><br/><a NAME="E3:76"/><i><font color="Green">E51</font></i>: 
<font color="Maroon">c</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">d</font>
 <b>and </b><br/><a NAME="E4:76"/><i><font color="Green">E52</font></i>: 
<font color="Maroon">K</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>
 <b>and </b><br/><a NAME="E5:76"/><i><font color="Green">E53</font></i>: 
( <font color="Maroon">M</font> <a href="hidden.html#R1">=</a>  <a href="analmetr.html#K4" target="_self">Line</a> <font color="Maroon">c</font>,<font color="Maroon">d</font> &amp; <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="analmetr.html#R4" target="_self">_|_</a> <font color="Maroon">c</font>,<font color="Maroon">d</font> )
 ;<br/>

<a NAME="E6:76"/>
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="analmetr.html#R6" target="_self">_|_</a> <font color="Maroon">M</font>
 
<b>by </b><i>, , <a class="ref" href="analmetr.html#T9" target="_self">Th9</a></i>;<br/>
<b>hence </b><a NAME="E7:76"/>
<font color="Maroon">K</font> <a href="analmetr.html#R7" target="_self">_|_</a> <font color="Maroon">M</font>
 <b>by </b><i><a class="ref" href="analmetr.html#T13" target="_self">Th13</a>, , <a class="ref" href="analmetr.html#T10" target="_self">Th10</a></i>;<br/>


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