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<b>let </b><font color="Maroon">a</font> be   <a href="pre_topc.html#NM2">Point</a> of <a href="topalg_2.html#K3">R^1</a> , <font color="Maroon">b</font> be   <a href="pre_topc.html#NM2">Point</a> of <a href="topalg_2.html#K3">R^1</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="topalg_2.html#D3">TOPALG_2:def 3</a><br/>

<a NAME="E1:65_1_1"/>
 <a href="toprealb.html#K5">R^1</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="toprealb.html#D3">TOPREALB:def 3</a></i>;<br/>
<b>hence </b><a NAME="E2:65_1_1"/>
(  not <font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="toprealb.html#K5">R^1</a> <font color="Maroon">A</font> or  not <font color="Maroon">b</font> <a href="hidden.html#R2">in</a>  <a href="toprealb.html#K5">R^1</a> <font color="Maroon">A</font> or <span class="p1"><a href="rcomp_1.html#K1">[.</a><span class="default"><font color="Maroon">a</font>,<font color="Maroon">b</font></span><a href="rcomp_1.html#K1">.]</a></span> <a href="tarski.html#R1">c=</a>  <a href="toprealb.html#K5">R^1</a> <font color="Maroon">A</font> )
 <b>by </b><i><a class="ref" href="jct_misc.html#D1">JCT_MISC:def 1</a></i>;<br/>


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