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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> 2</span>)</span>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font>, <font color="Maroon">c<sub>5</sub></font> be   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> 2</span>)</span>;<br/>









<b>assume </b><b>that </b><br/><a NAME="E1:84"/><i><font color="Green">E68</font></i>: 
<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>and </b><br/><a NAME="E2:84"/><i><font color="Green">E69</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 <b>and </b><br/><a NAME="E3:84"/><i><font color="Green">E70</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R2">in</a> <font color="Maroon">c<sub>1</sub></font>
 <b>and </b><br/><a NAME="E4:84"/><i><font color="Green">E71</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>5</sub></font>
 ;<br/>

<a NAME="E5:84"/><i><font color="Green">E72</font></i>: 
<font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>2</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="sppol_2.html#E1:84"><i><font color="Green">E68</font></i></a>, <a class="ref" href="sppol_2.html#T54" target="_self">Th54</a></i>;<br/>
<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="84_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:84_1"/>
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> or <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font> or <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>4</sub></font> or <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>4</sub></font> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="84_1_1"><b>suppose </b></a><a NAME="E1:84_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:84_1_1"/>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E1:84"><i><font color="Green">E68</font></i></a>, <a class="txt" href="sppol_2.html#E3:84"><i><font color="Green">E70</font></i></a>, <a class="txt" href="sppol_2.html#E4:84"><i><font color="Green">E71</font></i></a>, <a class="ref" href="sppol_2.html#T55" target="_self">Th55</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="84_1_2"><b>suppose </b></a><a NAME="E1:84_1_2"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:84_1_2"/>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E2:84"><i><font color="Green">E69</font></i></a>, <a class="txt" href="sppol_2.html#E4:84"><i><font color="Green">E71</font></i></a>, <a class="txt" href="sppol_2.html#E5:84"><i><font color="Green">E72</font></i></a>, <a class="ref" href="sppol_2.html#T56" target="_self">Th56</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="84_1_3"><b>suppose </b></a><a NAME="E1:84_1_3"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/><div class="add"><a NAME="E2:84_1_3"/><b>then </b>
<font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E1:84"><i><font color="Green">E68</font></i></a>, <a class="txt" href="sppol_2.html#E2:84"><i><font color="Green">E69</font></i></a>, <a class="ref" href="sppol_2.html#T55" target="_self">Th55</a></i>;<br/><a NAME="E3:84_1_3"/><b>then </b>
<font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>4</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E3:84"><i><font color="Green">E70</font></i></a>, <a class="txt" href="sppol_2.html#E4:84"><i><font color="Green">E71</font></i></a>, <a class="ref" href="sppol_2.html#T56" target="_self">Th56</a></i>;<br/><b>hence </b><a NAME="E4:84_1_3"/>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="sppol_2.html#T54" target="_self">Th54</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="84_1_4"><b>suppose </b></a><a NAME="E1:84_1_4"/>
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/><div class="add"><a NAME="E2:84_1_4"/><b>then </b>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E1:84"><i><font color="Green">E68</font></i></a>, <a class="txt" href="sppol_2.html#E2:84"><i><font color="Green">E69</font></i></a>, <a class="ref" href="sppol_2.html#T56" target="_self">Th56</a></i>;<br/><b>hence </b><a NAME="E3:84_1_4"/>
<font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font> <a href="sppol_2.html#R1" target="_self">split</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="sppol_2.html#E3:84"><i><font color="Green">E70</font></i></a>, <a class="txt" href="sppol_2.html#E4:84"><i><font color="Green">E71</font></i></a>, <a class="ref" href="sppol_2.html#T55" target="_self">Th55</a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

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