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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being   <a href="diraf.html#NM2">AffinPlane</a>;<br/>
<b>set </b><font color="Maroon">c<sub>2</sub></font> =  <a href="afproj.html#K13" target="_self">IncProjSp_of</a> <font color="Maroon">c<sub>1</sub></font>;<br/>
<a NAME="E2:67_1_1"/>
for <font color="Olive">b<sub>1</sub></font>, <font color="Olive">b<sub>2</sub></font> being  <a href="incsp_1.html#NM2">LINE</a> of <span class="p1">(<span class="default"><a href="afproj.html#K13" target="_self">IncProjSp_of</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>ex <font color="Olive">b<sub>3</sub></font> being  <a href="incsp_1.html#NM1">POINT</a> of <span class="p1">(<span class="default"><a href="afproj.html#K13" target="_self">IncProjSp_of</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> st <br/>( <font color="Olive">b<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>3</sub></font> <a href="incsp_1.html#R1">on</a> <font color="Olive">b<sub>2</sub></font> )
 
<b>by </b><i><a class="txt" href="afproj.html#E59"><i><font color="Green">Lemma46</font></i></a></i>;<br/>
<a NAME="E3:67_1_1"/><b>then </b>
 <a href="afproj.html#K13" target="_self">IncProjSp_of</a> <font color="Maroon">c<sub>1</sub></font> is  <a href="incproj.html#V6">2-dimensional</a> <a href="incproj.html#NM2">IncProjSp</a>
 
<b>by </b><i><a class="ref" href="incproj.html#D14">INCPROJ:def 14</a></i>;<br/>
<b>hence </b><a NAME="E4:67_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="incproj.html#NM2">IncProjSp</a> st <br/>( <font color="Olive">b<sub>1</sub></font> is <a href="incsp_1.html#V1">strict</a> &amp; <font color="Olive">b<sub>1</sub></font> is <a href="incproj.html#V6">2-dimensional</a> )
 ;<br/>


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