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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">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">AS</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">AS</font>;<br/><b>let </b><font color="Maroon">c</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">AS</font>;<br/><b>let </b><font color="Maroon">d</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">AS</font>;<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>assume </b><a NAME="E1:6"/><i><font color="Green">E34</font></i>: 
( ( <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> or <font color="Maroon">b</font>,<font color="Maroon">a</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> ) &amp; ( <font color="Maroon">c</font>,<font color="Maroon">d</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> or <font color="Maroon">d</font>,<font color="Maroon">c</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> ) )
 ;<br/>

<a NAME="E2:6"/><b>then </b><i><font color="Green">E35</font></i>: 
( <font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> &amp; <font color="Maroon">c</font>,<font color="Maroon">d</font> <a href="aff_1.html#R2">//</a> <font color="Maroon">M</font> )
 
<b>by </b><i><a class="ref" href="aff_1.html#T48">AFF_1:48</a></i>;<br/>
<a NAME="E3:6"/>
<font color="Maroon">M</font> <a href="aff_1.html#NR2" target="_self">is_line</a> 
 
<b>by </b><i>, <a class="ref" href="aff_1.html#T40">AFF_1:40</a></i>;<br/>
<b>hence </b><a NAME="E4:6"/>
<font color="Maroon">a</font>,<font color="Maroon">b</font> <a href="analoaf.html#R2">//</a> <font color="Maroon">c</font>,<font color="Maroon">d</font>
 <b>by </b><i>, <a class="ref" href="aff_1.html#T45">AFF_1:45</a></i>;<br/>


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