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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="incsp_1.html#L1">IncProjStr</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="incsp_1.html#NM1">POINT</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>6</sub></font>, <font color="Maroon">c<sub>7</sub></font>, <font color="Maroon">c<sub>8</sub></font>, <font color="Maroon">c<sub>9</sub></font> be   <a href="incsp_1.html#NM2">LINE</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

















<b>assume </b><b>that </b><br/><a NAME="E1:30"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="projpl_1.html#V1" target="_self">configuration</a>
 <b>and </b><br/><a NAME="E2:30"/><i><font color="Green">E28</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="projpl_1.html#R3" target="_self">on</a> <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font>,<font color="Maroon">c<sub>8</sub></font> &amp; <font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font>,<font color="Maroon">c<sub>8</sub></font> <a href="incproj.html#R1">are_mutually_different</a>  &amp; <font color="Maroon">c<sub>2</sub></font> <a href="projpl_1.html#NR1" target="_self">|'</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> <a href="projpl_1.html#R2" target="_self">on</a> <font color="Maroon">c<sub>9</sub></font>,<font color="Maroon">c<sub>6</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="projpl_1.html#R2" target="_self">on</a> <font color="Maroon">c<sub>9</sub></font>,<font color="Maroon">c<sub>7</sub></font> &amp; <font color="Maroon">c<sub>5</sub></font> <a href="projpl_1.html#R2" target="_self">on</a> <font color="Maroon">c<sub>9</sub></font>,<font color="Maroon">c<sub>8</sub></font> )
 ;<br/>

<a NAME="E3:30"/><i><font color="Green">E29</font></i>: 
( <font color="Maroon">c<sub>2</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>6</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>7</sub></font> &amp; <font color="Maroon">c<sub>2</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>8</sub></font> )
 
<b>by </b><i><a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="ref" href="projpl_1.html#D3" target="_self">Def3</a></i>;<br/>
<a NAME="E4:30"/><i><font color="Green">E30</font></i>: 
( <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>7</sub></font> &amp; <font color="Maroon">c<sub>7</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>8</sub></font> &amp; <font color="Maroon">c<sub>8</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>6</sub></font> )
 
<b>by </b><i><a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="ref" href="incproj.html#D5">INCPROJ:def 5</a></i>;<br/>
<a NAME="E5:30"/><i><font color="Green">E31</font></i>: 
( <font color="Maroon">c<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Maroon">c<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>6</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>7</sub></font> &amp; <font color="Maroon">c<sub>5</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>9</sub></font> &amp; <font color="Maroon">c<sub>5</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Maroon">c<sub>8</sub></font> )
 
<b>by </b><i><a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="ref" href="projpl_1.html#D2" target="_self">Def2</a></i>;<br/>
<a NAME="E6:30"/><b>then </b><i><font color="Green">E32</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>4</sub></font>
 
<b>by </b><i><a class="txt" href="projpl_1.html#E1:30"><i><font color="Green">E27</font></i></a>, <a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="txt" href="projpl_1.html#E3:30"><i><font color="Green">E29</font></i></a>, <a class="txt" href="projpl_1.html#E4:30"><i><font color="Green">E30</font></i></a>, <a class="ref" href="projpl_1.html#D4" target="_self">Def4</a></i>;<br/>
<a NAME="E7:30"/><i><font color="Green">E33</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>5</sub></font>
 
<b>by </b><i><a class="txt" href="projpl_1.html#E1:30"><i><font color="Green">E27</font></i></a>, <a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="txt" href="projpl_1.html#E3:30"><i><font color="Green">E29</font></i></a>, <a class="txt" href="projpl_1.html#E4:30"><i><font color="Green">E30</font></i></a>, <a class="txt" href="projpl_1.html#E5:30"><i><font color="Green">E31</font></i></a>, <a class="ref" href="projpl_1.html#D4" target="_self">Def4</a></i>;<br/>
<a NAME="E8:30"/>
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="txt" href="projpl_1.html#E1:30"><i><font color="Green">E27</font></i></a>, <a class="txt" href="projpl_1.html#E2:30"><i><font color="Green">E28</font></i></a>, <a class="txt" href="projpl_1.html#E3:30"><i><font color="Green">E29</font></i></a>, <a class="txt" href="projpl_1.html#E4:30"><i><font color="Green">E30</font></i></a>, <a class="txt" href="projpl_1.html#E5:30"><i><font color="Green">E31</font></i></a>, <a class="ref" href="projpl_1.html#D4" target="_self">Def4</a></i>;<br/>
<b>hence </b><a NAME="E9:30"/>
<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="incproj.html#R1">are_mutually_different</a> 
 <b>by </b><i><a class="txt" href="projpl_1.html#E6:30"><i><font color="Green">E32</font></i></a>, <a class="txt" href="projpl_1.html#E7:30"><i><font color="Green">E33</font></i></a>, <a class="ref" href="incproj.html#D5">INCPROJ:def 5</a></i>;<br/>


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