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<b>let </b><font color="Maroon">c<sub>7</sub></font> be   <a href="analmetr.html#NM2">OrtAfPl</a>;<br/><b>let </b><font color="Maroon">c<sub>8</sub></font>, <font color="Maroon">c<sub>9</sub></font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>7</sub></font>;<br/>





<b>assume </b><a NAME="E1:99"/><i><font color="Green">E74</font></i>: 
<font color="Maroon">c<sub>8</sub></font> <a href="analmetr.html#R10" target="_self">_|_</a> <font color="Maroon">c<sub>9</sub></font>
 ;<br/>

<a NAME="E2:99"/><b>then </b><i><font color="Green">E75</font></i>: 
not <font color="Maroon">c<sub>8</sub></font> <a href="analmetr.html#R9" target="_self">//</a> <font color="Maroon">c<sub>9</sub></font>
 
<b>by </b><i><a class="ref" href="analmetr.html#T73" target="_self">Th73</a></i>;<br/>
<b>reconsider </b><font color="Maroon">c<sub>10</sub></font> = <font color="Maroon">c<sub>8</sub></font>, <font color="Maroon">c<sub>11</sub></font> = <font color="Maroon">c<sub>9</sub></font> as   <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="analmetr.html#K3" target="_self">Af</a> <font color="Maroon">c<sub>7</sub></font></span>)</span> ;<br/>
<a NAME="E4:99"/>
( <font color="Maroon">c<sub>8</sub></font> is <a href="analmetr.html#V4" target="_self">being_line</a> &amp; <font color="Maroon">c<sub>9</sub></font> is <a href="analmetr.html#V4" target="_self">being_line</a> )
 
<b>by </b><i><a class="txt" href="analmetr.html#E1:99"><i><font color="Green">E74</font></i></a>, <a class="ref" href="analmetr.html#T62" target="_self">Th62</a></i>;<br/>
<a NAME="E5:99"/><b>then </b><i><font color="Green">E76</font></i>: 
( <font color="Maroon">c<sub>10</sub></font> <a href="aff_1.html#NR2" target="_self">is_line</a>  &amp; <font color="Maroon">c<sub>11</sub></font> <a href="aff_1.html#NR2" target="_self">is_line</a>  )
 
<b>by </b><i><a class="ref" href="analmetr.html#T58" target="_self">Th58</a></i>;<br/>
<a NAME="E6:99"/>
not <font color="Maroon">c<sub>10</sub></font> <a href="aff_1.html#R4">//</a> <font color="Maroon">c<sub>11</sub></font>
 
<b>by </b><i><a class="txt" href="analmetr.html#E2:99"><i><font color="Green">E75</font></i></a>, <a class="ref" href="analmetr.html#T64" target="_self">Th64</a></i>;<br/>
<b>then consider </b><font color="Maroon">c<sub>12</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="analmetr.html#K3" target="_self">Af</a> <font color="Maroon">c<sub>7</sub></font></span>)</span><b> such that </b><br/><a NAME="E8:99"/><i><font color="Green">E77</font></i>: 
( <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>10</sub></font> &amp; <font color="Maroon">c<sub>12</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>11</sub></font> )
 <b>by </b><i><a class="txt" href="analmetr.html#E5:99"><i><font color="Green">E76</font></i></a>, <a class="ref" href="aff_1.html#T72">AFF_1:72</a></i>;<br/>
<b>thus </b><a NAME="E9:99"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>7</sub></font> st <br/>( <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>8</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>9</sub></font> )
 <b>by </b><i><a class="txt" href="analmetr.html#E8:99"><i><font color="Green">E77</font></i></a></i>;<br/>


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