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<b>let </b><font color="Maroon" title="c1">A</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <a href="topmetr.html#K3" title="TOPMETR:func.3">R^1</a> ;<br/><b>let </b><font color="Maroon" title="c2">a</font>, <font color="Maroon" title="c3">b</font> be  <a href="xreal_0.html#V1" title="XREAL_0:attr.1">real</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>



<b>assume </b><a NAME="E1:85"/><i><font color="Green" title="E69">A1</font></i>: 
( <font color="Maroon" title="c2">a</font> <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> <font color="Maroon" title="c3">b</font> &amp; <font color="Maroon" title="c1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="rcomp_2.html#K1" title="RCOMP_2:func.1">[.</a><span class="default"><font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font></span><a href="rcomp_2.html#K1" title="RCOMP_2:func.1">.[</a></span> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <span class="p1"><a href="borsuk_5.html#NK4" title="BORSUK_5:NK.4">].</a><span class="default"><font color="Maroon" title="c3">b</font></span><a href="borsuk_5.html#NK4" title="BORSUK_5:NK.4">,+infty.[</a></span> )
 ;<br/>

<b>reconsider </b><font color="Maroon" title="c4">B</font> = <span class="p1"><a href="rcomp_2.html#K1" title="RCOMP_2:func.1">[.</a><span class="default"><font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font></span><a href="rcomp_2.html#K1" title="RCOMP_2:func.1">.[</a></span>, <font color="Maroon" title="c5">C</font> = <span class="p1"><a href="borsuk_5.html#NK4" title="BORSUK_5:NK.4">].</a><span class="default"><font color="Maroon" title="c3">b</font></span><a href="borsuk_5.html#NK4" title="BORSUK_5:NK.4">,+infty.[</a></span> as   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <a href="topmetr.html#K3" title="TOPMETR:func.3">R^1</a>  <b>by </b><i><a class="ref" href="topmetr.html#T24" title="TOPMETR:th.24">TOPMETR:24</a></i>;<br/>
<a NAME="E3:85"/><i><font color="Green" title="E70">A2</font></i>: 
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c4">B</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="rcomp_1.html#K1" title="RCOMP_1:func.1">[.</a><span class="default"><font color="Maroon" title="c2">a</font>,<font color="Maroon" title="c3">b</font></span><a href="rcomp_1.html#K1" title="RCOMP_1:func.1">.]</a></span>
 
<b>by </b><i><a class="txt" href="borsuk_5.html#E1:85"><i><font color="Green" title="E69">A1</font></i></a>, <a class="ref" href="borsuk_5.html#T58" target="_self" title="BORSUK_5:th.58">Th58</a></i>;<br/>
<a NAME="E4:85"/><i><font color="Green" title="E71">A3</font></i>: 
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c5">C</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="borsuk_5.html#NK3" title="BORSUK_5:NK.3">[.</a><span class="default"><font color="Maroon" title="c3">b</font></span><a href="borsuk_5.html#NK3" title="BORSUK_5:NK.3">,+infty.[</a></span>
 
<b>by </b><i><a class="ref" href="borsuk_5.html#T75" target="_self" title="BORSUK_5:th.75">Th75</a></i>;<br/>
<a NAME="E5:85"/>
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c4">B</font></span>)</span> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c5">C</font></span>)</span>
 
<b>by </b><i><a class="txt" href="borsuk_5.html#E1:85"><i><font color="Green" title="E69">A1</font></i></a>, <a class="ref" href="pre_topc.html#T50" title="PRE_TOPC:th.50">PRE_TOPC:50</a></i>;<br/>
<b>hence </b><a NAME="E6:85"/>
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c1">A</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="borsuk_5.html#NK3" title="BORSUK_5:NK.3">[.</a><span class="default"><font color="Maroon" title="c2">a</font></span><a href="borsuk_5.html#NK3" title="BORSUK_5:NK.3">,+infty.[</a></span>
 <b>by </b><i><a class="txt" href="borsuk_5.html#E1:85"><i><font color="Green" title="E69">A1</font></i></a>, <a class="txt" href="borsuk_5.html#E3:85"><i><font color="Green" title="E70">A2</font></i></a>, <a class="txt" href="borsuk_5.html#E4:85"><i><font color="Green" title="E71">A3</font></i></a>, <a class="ref" href="borsuk_5.html#T28" target="_self" title="BORSUK_5:th.28">Th28</a></i>;<br/>


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