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<b>let </b><font color="Maroon">T</font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">T</font>, <font color="Maroon">q</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">T</font>;<br/>



<b>set </b><font color="Maroon">F</font> =  <a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font>;<br/>
<b>set </b><font color="Maroon">R</font> =  <a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font>;<br/>
<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:13_1"/>
<span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">p</font>
 ;<br/><a NAME="E2:13_1"/><b>then </b>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">p</font>
 <b>by </b><i/>;<br/><a NAME="E3:13_1"/><b>then </b>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a>  <a href="eqrel_1.html#K7">Class</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font></span>)</span>,<font color="Maroon">p</font>
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E4:13_1"/>
<span class="p1"><a href="borsuk_1.html#K7">[</a><span class="default"><font color="Maroon">q</font>,<font color="Maroon">p</font></span><a href="borsuk_1.html#K7">]</a></span> <a href="hidden.html#R2">in</a>  <a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font>
 <b>by </b><i><a class="ref" href="eqrel_1.html#T27">EQREL_1:27</a></i>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:13"/>
<span class="p1"><a href="borsuk_1.html#K7">[</a><span class="default"><font color="Maroon">q</font>,<font color="Maroon">p</font></span><a href="borsuk_1.html#K7">]</a></span> <a href="hidden.html#R2">in</a>  <a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font>
 ;<br/>

<a NAME="E3:13"/><b>then </b>
 <a href="eqrel_1.html#K7">Class</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font></span>)</span>,<font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K7">Class</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font></span>)</span>,<font color="Maroon">p</font>
 
<b>by </b><i><a class="ref" href="eqrel_1.html#T44">EQREL_1:44</a></i>;<br/>
<a NAME="E4:13"/><b>then </b>
<span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="eqrel_1.html#K7">Class</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K1" target="_self">Indiscernibility</a> <font color="Maroon">T</font></span>)</span>,<font color="Maroon">p</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:13"/>
<span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="t_0topsp.html#K4" target="_self">T_0-canonical_map</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">p</font>
 <b>by </b><i/>;<br/>


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