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<b>let </b><font color="Maroon">S</font> be   <a href="analoaf.html#NM1">OAffinSpace</a>;<br/>

<b>consider </b><font color="Maroon">x</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>, <font color="Maroon">y</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>, <font color="Maroon">z</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font>, <font color="Maroon">t</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font><b> such that </b><br/><a NAME="E2:31"/><i><font color="Green">E21</font></i>: 
( not <font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="analoaf.html#R2">//</a> <font color="Maroon">z</font>,<font color="Maroon">t</font> &amp; not <font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="analoaf.html#R2">//</a> <font color="Maroon">t</font>,<font color="Maroon">z</font> )
 <b>by </b><i><a class="ref" href="analoaf.html#D5">ANALOAF:def 5</a></i>;<br/>
<a NAME="E3:31"/><i><font color="Green">E26</font></i>: 
( <font color="Maroon">x</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">y</font> &amp; <font color="Maroon">z</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">t</font> )
 
<b>by </b><i><a class="txt" href="diraf.html#E2:31"><i><font color="Green">E21</font></i></a>, </i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="31_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:31_1"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">x</font>,<font color="Maroon">z</font>
 ;<br/><b>thus </b><a NAME="E2:31_1"/>
not <font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">x</font>,<font color="Maroon">t</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="31_1_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:31_1_1"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">x</font>,<font color="Maroon">t</font>
 ;<br/>

<a NAME="E2:31_1_1"/><b>then </b>
<font color="Maroon">x</font>,<font color="Maroon">z</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">x</font>,<font color="Maroon">t</font>
 
<b>by </b><i>, , </i>;<br/>
<a NAME="E3:31_1_1"/><b>then </b>
<font color="Maroon">z</font>,<font color="Maroon">x</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">z</font>,<font color="Maroon">t</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:31_1_1"/><b>then </b>
<font color="Maroon">x</font>,<font color="Maroon">z</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">z</font>,<font color="Maroon">t</font>
 
<b>by </b><i><a class="ref" href="diraf.html#D1" target="_self">Def1</a></i>;<br/>
<a NAME="E5:31_1_1"/><b>then </b>
( <font color="Maroon">x</font>,<font color="Maroon">y</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Maroon">z</font>,<font color="Maroon">t</font> or <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">z</font> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:31_1_1"/>
contradiction
 <b>by </b><i><a class="txt" href="diraf.html#E2:31"><i><font color="Green">E21</font></i></a>, , </i>;<br/>


</div><b>end;</b></div></div><b>end;</b></div>
<b>hence </b><a NAME="E5:31"/>
not for <font color="Olive">x</font>, <font color="Olive">y</font>, <font color="Olive">z</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">S</font> holds  <font color="Olive">x</font>,<font color="Olive">y</font> <a href="diraf.html#R2" target="_self">'||'</a> <font color="Olive">x</font>,<font color="Olive">z</font>
 ;<br/>


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