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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15" target="_self">TOP-REAL</a> 2</span>)</span>;<br/>

<b>consider </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font> being   <a href="real_1.html#NM1">Real</a><b> such that </b><br/><a NAME="E2:76"/><i><font color="Green">E50</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="finseq_1.html#K10">*&gt;</a></span>
 <b>by </b><i><a class="ref" href="euclid.html#T55" target="_self">Th55</a></i>;<br/>
<b>reconsider </b><font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>1</sub></font> as   <a href="finseq_1.html#NM1">FinSequence</a> <b>by </b><i><a class="ref" href="euclid.html#T27" target="_self">Th27</a></i>;<br/>
<i><font color="Green">E51</font></i>: <font color="Maroon">c<sub>1</sub></font> <a href="euclid.html#K21" target="_self">`1</a>  = 
<font color="Maroon">c<sub>4</sub></font> <a href="funct_1.html#K1">.</a> 1
<b>by </b><i><a class="ref" href="euclid.html#D14" target="_self">Def14</a></i>
<br/>.= 
<font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="txt" href="euclid.html#E2:76"><i><font color="Green">E50</font></i></a>, <a class="ref" href="finseq_1.html#T61">FINSEQ_1:61</a></i>
;<br/>
<font color="Maroon">c<sub>1</sub></font> <a href="euclid.html#K22" target="_self">`2</a>  = 
<font color="Maroon">c<sub>4</sub></font> <a href="funct_1.html#K1">.</a> 2
<b>by </b><i><a class="ref" href="euclid.html#D15" target="_self">Def15</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font>
<b>by </b><i><a class="txt" href="euclid.html#E2:76"><i><font color="Green">E50</font></i></a>, <a class="ref" href="finseq_1.html#T61">FINSEQ_1:61</a></i>
;<br/>
<b>hence </b><a NAME="E6:76"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="euclid.html#K23" target="_self">|[</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="euclid.html#K21" target="_self">`1</a> </span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="euclid.html#K22" target="_self">`2</a> </span>)</span></span><a href="euclid.html#K23" target="_self">]|</a></span>
 <b>by </b><i><a class="txt" href="euclid.html#E2:76"><i><font color="Green">E50</font></i></a>, <a class="txt" href="euclid.html#E4:76"><i><font color="Green">E51</font></i></a></i>;<br/>


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