<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">OAS</font> be   <a href="analoaf.html#NM1">OAffinSpace</a>;<br/><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="pasch.html#D4" target="_self">PASCH:def 4</a><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">d</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/><b>let </b><font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font>;<br/>













<b>assume </b><a NAME="E1:40"/>
(  <a href="diraf.html#R1">Mid</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">d</font> &amp;  <a href="diraf.html#R1">Mid</a> <font color="Maroon">b</font>,<font color="Maroon">x</font>,<font color="Maroon">c</font> &amp; not  <a href="diraf.html#R3">LIN</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">c</font> )
 ;<br/>

<b>hence </b><a NAME="E2:40"/>
 ex <font color="Olive">y</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">OAS</font> st <br/>(  <a href="diraf.html#R1">Mid</a> <font color="Maroon">a</font>,<font color="Olive">y</font>,<font color="Maroon">c</font> &amp;  <a href="diraf.html#R1">Mid</a> <font color="Olive">y</font>,<font color="Maroon">x</font>,<font color="Maroon">d</font> )
 <b>by </b><i/>;<br/>


</div>
