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<b>let </b><font color="Maroon">OAS</font> be   <a href="analoaf.html#NM1">OAffinSpace</a>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">c</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">d1</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">d2</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/>













<b>assume </b><b>that </b><br/><a NAME="E1:16"/><i><font color="Green">E29</font></i>: 
not  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">a</font>,<font color="Maroon">b</font>
 <b>and </b><br/><a NAME="E2:16"/><i><font color="Green">E30</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">b</font>,<font color="Maroon">c</font>
 <b>and </b><br/><a NAME="E3:16"/><i><font color="Green">E31</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">a</font>,<font color="Maroon">d1</font>
 <b>and </b><br/><a NAME="E4:16"/><i><font color="Green">E32</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">a</font>,<font color="Maroon">d2</font>
 <b>and </b><br/><a NAME="E5:16"/><i><font color="Green">E33</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="diraf.html#R2">'||'</a> <font color="Maroon">c</font>,<font color="Maroon">d1</font>
 <b>and </b><br/><a NAME="E6:16"/><i><font color="Green">E34</font></i>: 
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="diraf.html#R2">'||'</a> <font color="Maroon">c</font>,<font color="Maroon">d2</font>
 ;<br/>

<a NAME="E7:16"/><i><font color="Green">E35</font></i>: 
(  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d1</font>,<font color="Maroon">a</font> &amp;  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d2</font>,<font color="Maroon">a</font> )
 
<b>by </b><i>, , <a class="ref" href="diraf.html#T36">DIRAF:36</a></i>;<br/>
<a NAME="E8:16"/><i><font color="Green">E36</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">a</font> &amp; <font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font> &amp; <font color="Maroon">a</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">b</font> )
 
<b>by </b><i>, <a class="ref" href="diraf.html#T37">DIRAF:37</a></i>;<br/>
<div><i><font color="Green">E37</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="16_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:16_1"/>
<font color="Maroon">c</font> <a href="hidden.html#R1">=</a> <font color="Maroon">p</font>
 ;<br/><a NAME="E2:16_1"/><b>then </b><i><font color="Green">E38</font></i>: 
( <font color="Maroon">p</font>,<font color="Maroon">d1</font> <a href="diraf.html#R2">'||'</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> &amp; <font color="Maroon">p</font>,<font color="Maroon">d2</font> <a href="diraf.html#R2">'||'</a> <font color="Maroon">a</font>,<font color="Maroon">b</font> )
 <b>by </b><i>, , <a class="ref" href="diraf.html#T27">DIRAF:27</a></i>;<br/><a NAME="E3:16_1"/><i><font color="Green">E39</font></i>: 
(  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d1</font>,<font color="Maroon">p</font> &amp;  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d2</font>,<font color="Maroon">p</font> )
 <b>by </b><i><a class="ref" href="diraf.html#T37">DIRAF:37</a></i>;<br/><div><i><font color="Green">E40</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="16_1_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:16_1_1"/><i><font color="Green">E41</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">d1</font>
 ;<br/><a NAME="E2:16_1_1"/><b>then </b>
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d1</font>,<font color="Maroon">b</font>
 <b>by </b><i>, , <a class="ref" href="diraf.html#T39">DIRAF:39</a></i>;<br/><b>hence </b><a NAME="E3:16_1_1"/>
contradiction
 <b>by </b><i>, , , , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="16_1_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:16_1_2"/><i><font color="Green">E42</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">d2</font>
 ;<br/><a NAME="E2:16_1_2"/><b>then </b>
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">d2</font>,<font color="Maroon">b</font>
 <b>by </b><i>, , <a class="ref" href="diraf.html#T39">DIRAF:39</a></i>;<br/><b>hence </b><a NAME="E3:16_1_2"/>
contradiction
 <b>by </b><i>, , , , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/></div><b>end;</b></div><b>hence </b><a NAME="E6:16_1"/>
<font color="Maroon">d1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">d2</font>
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="16_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:16_2"/><i><font color="Green">E43</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c</font>
 ;<br/><b>assume </b><a NAME="E2:16_2"/><i><font color="Green">E44</font></i>: 
<font color="Maroon">d1</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">d2</font>
 ;<br/><a NAME="E3:16_2"/><i><font color="Green">E45</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">a</font>,<font color="Maroon">p</font>
 <b>by </b><i><a class="ref" href="diraf.html#T37">DIRAF:37</a></i>;<br/><a NAME="E4:16_2"/><b>then </b><i><font color="Green">E46</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">p</font>
 <b>by </b><i>, , , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><a NAME="E5:16_2"/>
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">a</font>,<font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="diraf.html#T37">DIRAF:37</a></i>;<br/><a NAME="E6:16_2"/><b>then </b><i><font color="Green">E47</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">a</font>
 <b>by </b><i>, , , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><a NAME="E7:16_2"/>
<font color="Maroon">c</font>,<font color="Maroon">d1</font> <a href="diraf.html#R2">'||'</a> <font color="Maroon">c</font>,<font color="Maroon">d2</font>
 <b>by </b><i>, , , <a class="ref" href="diraf.html#T28">DIRAF:28</a></i>;<br/><a NAME="E8:16_2"/><b>then </b><i><font color="Green">E48</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">c</font>,<font color="Maroon">d1</font>,<font color="Maroon">d2</font>
 <b>by </b><i><a class="ref" href="diraf.html#D5">DIRAF:def 5</a></i>;<br/><a NAME="E9:16_2"/><b>then </b><i><font color="Green">E51</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">c</font>
 <b>by </b><i><a class="ref" href="diraf.html#T36">DIRAF:36</a></i>;<br/><a NAME="E10:16_2"/>
(  <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">p</font> &amp;  <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">c</font> &amp;  <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">d1</font> )
 <b>by </b><i>, , , , , <a class="ref" href="diraf.html#T36">DIRAF:36</a>, <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><a NAME="E11:16_2"/><b>then </b><i><font color="Green">E52</font></i>: 
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">c</font>,<font color="Maroon">d1</font>
 <b>by </b><i>, <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><a NAME="E12:16_2"/>
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">d2</font>
 <b>by </b><i><a class="ref" href="diraf.html#T37">DIRAF:37</a></i>;<br/><a NAME="E13:16_2"/><b>then </b>
(  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">c</font>,<font color="Maroon">d2</font> &amp;  <a href="diraf.html#R3">LIN</a> <font color="Maroon">p</font>,<font color="Maroon">c</font>,<font color="Maroon">b</font> )
 <b>by </b><i>, , , , <a class="ref" href="diraf.html#T36">DIRAF:36</a>, <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><a NAME="E14:16_2"/><b>then </b>
 <a href="diraf.html#R3">LIN</a> <font color="Maroon">d1</font>,<font color="Maroon">d2</font>,<font color="Maroon">b</font>
 <b>by </b><i>, , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/><b>hence </b><a NAME="E15:16_2"/>
contradiction
 <b>by </b><i>, , , , <a class="ref" href="diraf.html#T38">DIRAF:38</a></i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E11:16"/>
<font color="Maroon">d1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">d2</font>
 <b>by </b><i/>;<br/>


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