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<b>let </b><font color="Maroon">S</font> be   <a href="analoaf.html#NM2">OAffinPlane</a>;<br/>

<b>set </b><font color="Maroon">AS</font> =  <a href="diraf.html#K2" target="_self">Lambda</a> <font color="Maroon">S</font>;<br/>
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for <font color="Olive">x</font>, <font color="Olive">y</font>, <font color="Olive">z</font>, <font color="Olive">t</font> being  <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="diraf.html#K2" target="_self">Lambda</a> <font color="Maroon">S</font></span>)</span>  st not <font color="Olive">x</font>,<font color="Olive">y</font> <a href="analoaf.html#R2">//</a> <font color="Olive">z</font>,<font color="Olive">t</font> holds <br/> ex <font color="Olive">u</font> being  <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="diraf.html#K2" target="_self">Lambda</a> <font color="Maroon">S</font></span>)</span> st <br/>( <font color="Olive">x</font>,<font color="Olive">y</font> <a href="analoaf.html#R2">//</a> <font color="Olive">x</font>,<font color="Olive">u</font> &amp; <font color="Olive">z</font>,<font color="Olive">t</font> <a href="analoaf.html#R2">//</a> <font color="Olive">z</font>,<font color="Olive">u</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:59"/>
 <a href="diraf.html#K2" target="_self">Lambda</a> <font color="Maroon">S</font> is   <a href="diraf.html#NM2">AffinPlane</a>
 <b>by </b><i>, </i>;<br/>


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