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<b>let </b><font color="Maroon">AS</font> be   <a href="diraf.html#NM1">AffinSpace</a>;<br/><b>let </b><font color="Maroon">M</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">AS</font>;<br/><b>let </b><font color="Maroon">X</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">AS</font>;<br/>





<b>assume </b><a NAME="E1:55"/><i><font color="Green">E34</font></i>: 
( <font color="Maroon">M</font> <a href="aff_1.html#NR2" target="_self">is_line</a>  &amp; <font color="Maroon">X</font> <a href="aff_4.html#NR1" target="_self">is_plane</a>  &amp; <font color="Maroon">M</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">X</font> )
 ;<br/>

<a NAME="E2:55"/><b>then </b>
<font color="Maroon">M</font> <a href="aff_1.html#R4">//</a> <font color="Maroon">M</font>
 
<b>by </b><i><a class="ref" href="aff_1.html#T55">AFF_1:55</a></i>;<br/>
<b>hence </b><a NAME="E3:55"/>
<font color="Maroon">M</font> <a href="aff_4.html#R1" target="_self">'||'</a> <font color="Maroon">X</font>
 <b>by </b><i><a class="ref" href="aff_4.html#T8" target="_self">Th8</a>, </i>;<br/>


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