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<b>let </b><font color="Maroon">CPS</font> be  <a href="collsp.html#V4">proper</a> <a href="collsp.html#NM2">CollSp</a>;<br/><b>let </b><font color="Maroon">a'</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CPS</font>;<br/>



<b>consider </b><font color="Maroon">p'</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CPS</font>, <font color="Maroon">q'</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CPS</font>, <font color="Maroon">r'</font> being   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CPS</font><b> such that </b><br/><a NAME="E2:10"/><i><font color="Green">E21</font></i>: 
( <font color="Maroon">p'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">q'</font> &amp; <font color="Maroon">q'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">r'</font> &amp; <font color="Maroon">r'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">p'</font> )
 <b>by </b><i/>;<br/>
<a NAME="E3:10"/>
( <font color="Maroon">a'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">p'</font> or <font color="Maroon">a'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">q'</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:10"/>
 ex <font color="Olive">b'</font> being  <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">CPS</font> st <font color="Maroon">a'</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Olive">b'</font>
 ;<br/>


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