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<b>let </b><font color="Maroon">c<sub>1</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <a href="fin_topo.html#K3" target="_self">FT{0}</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="fin_topo.html#D3" target="_self">FIN_TOPO:def 3</a><br/>

<a NAME="E1:11"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> 0
 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<a NAME="E2:11"/><b>then </b><i><font color="Green">E6</font></i>: 
<span class="p1">(<span class="default">0 <a href="fin_topo.html#K2" target="_self">.--&gt;</a> <span class="p2">(<span class="default"><a href="subset_1.html#K2">[#]</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default">0</span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="subset_1.html#K2">[#]</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default">0</span><a href="domain_1.html#K6">}</a></span>
 
<b>by </b><i><a class="ref" href="cqc_lang.html#T6">CQC_LANG:6</a></i>;<br/>
<a NAME="E3:11"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a> the <a href="fin_topo.html#U1" target="_self">Nbd</a> of <a href="fin_topo.html#K3" target="_self">FT{0}</a>  <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="fin_topo.html#E2:11"><i><font color="Green">E6</font></i></a></i>;<br/>
<b>hence </b><a NAME="E4:11"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="fin_topo.html#K1" target="_self">U_FT</a> <font color="Maroon">c<sub>1</sub></font>
 ;<br/>


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