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<b>consider </b><font color="Maroon">S</font> being   <a href="analoaf.html#NM2">OAffinPlane</a>;<br/>
<b>reconsider </b><font color="Maroon">AS</font> =  <a href="diraf.html#K2" target="_self">Lambda</a> <font color="Maroon">S</font> as   <a href="diraf.html#NM1">AffinSpace</a> <b>by </b><i/>;<br/>
<a NAME="E3:57_1_1"/>
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 <font color="Maroon">AS</font>  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 <font color="Maroon">AS</font> 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/>
<a NAME="E4:57_1_1"/><b>then </b>
<font color="Maroon">AS</font> is <a href="diraf.html#V2" target="_self">2-dimensional</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:57_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="diraf.html#NM1">AffinSpace</a> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="analoaf.html#V1">strict</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="diraf.html#V2" target="_self">2-dimensional</a> )
 ;<br/>


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