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<b>let </b><font color="Maroon" title="c1">FT</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>  <a href="orders_2.html#L1" title="ORDERS_2:struct.1">RelStr</a> ;<br/><b>let </b><font color="Maroon" title="c2">C</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">FT</font>;<br/>



<b>assume </b><a NAME="E1:53"/><i><font color="Green" title="E29">A1</font></i>: 
( <font color="Maroon" title="c1">FT</font> is <a href="orders_2.html#V3" title="ORDERS_2:attr.3">reflexive</a> &amp; <font color="Maroon" title="c1">FT</font> is <a href="fin_topo.html#V1" title="FIN_TOPO:attr.1">symmetric</a> &amp; <font color="Maroon" title="c2">C</font> is <a href="fin_topo.html#V4" title="FIN_TOPO:attr.4">connected</a> )
 ;<br/>

<b>let </b><font color="Maroon" title="c3">S</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">FT</font>;<br/>

<b>assume </b><a NAME="E2:53"/><i><font color="Green" title="E30">A2</font></i>: 
<font color="Maroon" title="c3">S</font> <a href="fintopo6.html#R1" title="FINTOPO6:pred.1">is_a_component_of</a> <font color="Maroon" title="c1">FT</font>
 ;<br/>

<b>assume </b><a NAME="E3:53"/>
<font color="Maroon" title="c2">C</font> <a href="xboole_0.html#NR5" title="XBOOLE_0:NR.5">meets</a> <font color="Maroon" title="c3">S</font>
 ;<br/>

<a NAME="E4:53"/><b>then </b><i><font color="Green" title="E31">A3</font></i>: 
not <font color="Maroon" title="c2">C</font>,<font color="Maroon" title="c3">S</font> <a href="fintopo4.html#R1" title="FINTOPO4:pred.1">are_separated</a> 
 
<b>by </b><i><a class="txt" href="fintopo6.html#E1:53"><i><font color="Green" title="E29">A1</font></i></a>, <a class="ref" href="fintopo4.html#T6" title="FINTOPO4:th.6">FINTOPO4:6</a></i>;<br/>
<a NAME="E5:53"/>
<font color="Maroon" title="c3">S</font> is <a href="fin_topo.html#V4" title="FIN_TOPO:attr.4">connected</a>
 
<b>by </b><i><a class="txt" href="fintopo6.html#E2:53"><i><font color="Green" title="E30">A2</font></i></a>, <a class="ref" href="fintopo6.html#D4" target="_self" title="FINTOPO6:def.4">Def4</a></i>;<br/>
<a NAME="E6:53"/><b>then </b><i><font color="Green" title="E32">A4</font></i>: 
<font color="Maroon" title="c2">C</font> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <font color="Maroon" title="c3">S</font> is <a href="fin_topo.html#V4" title="FIN_TOPO:attr.4">connected</a>
 
<b>by </b><i><a class="txt" href="fintopo6.html#E1:53"><i><font color="Green" title="E29">A1</font></i></a>, <a class="txt" href="fintopo6.html#E4:53"><i><font color="Green" title="E31">A3</font></i></a>, <a class="ref" href="fintopo6.html#T34" target="_self" title="FINTOPO6:th.34">Th34</a></i>;<br/>
<a NAME="E7:53"/>
<font color="Maroon" title="c3">S</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c2">C</font> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <font color="Maroon" title="c3">S</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T7" title="XBOOLE_1:th.7">XBOOLE_1:7</a></i>;<br/>
<a NAME="E8:53"/><b>then </b>
<font color="Maroon" title="c3">S</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">C</font> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <font color="Maroon" title="c3">S</font>
 
<b>by </b><i><a class="txt" href="fintopo6.html#E2:53"><i><font color="Green" title="E30">A2</font></i></a>, <a class="txt" href="fintopo6.html#E6:53"><i><font color="Green" title="E32">A4</font></i></a>, <a class="ref" href="fintopo6.html#D4" target="_self" title="FINTOPO6:def.4">Def4</a></i>;<br/>
<b>hence </b><a NAME="E9:53"/>
<font color="Maroon" title="c2">C</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a> <font color="Maroon" title="c3">S</font>
 <b>by </b><i><a class="ref" href="xboole_1.html#T7" title="XBOOLE_1:th.7">XBOOLE_1:7</a></i>;<br/>


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