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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>assume </b><a NAME="E1:72"/><i><font color="Green">E34</font></i>: 
( <font color="Maroon">T</font> is <a href="waybel_3.html#V6" target="_self">locally-compact</a> &amp; <font color="Maroon">T</font> <a href="compts_1.html#NR2" target="_self">is_T2</a>  )
 ;<br/>

<b>set </b><font color="Maroon">L</font> =  <a href="yellow_1.html#K2">InclPoset</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font>;<br/>
<a NAME="E2:72"/><i><font color="Green">E35</font></i>: 
 <a href="yellow_1.html#K2">InclPoset</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font> <a href="hidden.html#R1">=</a>  <a href="orders_2.html#G1">RelStr</a>(# the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font>,<span class="p1">(<span class="default"><a href="yellow_1.html#K1">RelIncl</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font></span>)</span> #)
 
<b>by </b><i><a class="ref" href="yellow_1.html#D1">YELLOW_1:def 1</a></i>;<br/>
<b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K2">InclPoset</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font></span>)</span>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K2">InclPoset</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font></span>)</span>;<br/>

<b>assume </b><a NAME="E3:72"/>
<font color="Maroon">x</font> <a href="waybel_3.html#NR2" target="_self">&lt;&lt;</a> <font color="Maroon">y</font>
 ;<br/>

<b>then consider </b><font color="Maroon">Z</font> being   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font><b> such that </b><br/><a NAME="E5:72"/><i><font color="Green">E39</font></i>: 
( <font color="Maroon">x</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Z</font> &amp; <font color="Maroon">Z</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">y</font> &amp; <font color="Maroon">Z</font> is <a href="compts_1.html#V6">compact</a> )
 <b>by </b><i><a class="ref" href="waybel_3.html#D2" target="_self">Def2</a>, </i>;<br/>
<a NAME="E6:72"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> the <a href="pre_topc.html#U1">topology</a> of <font color="Maroon">T</font>
 
<b>by </b><i><a class="ref" href="waybel_3.html#T1" target="_self">Th1</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">X</font> = <font color="Maroon">x</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> ;<br/>
<b>take </b>
<font color="Maroon">X</font>
;<br/>

<b>thus </b><a NAME="E8:72"/>
<font color="Maroon">X</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font>
 ;<br/>

<a NAME="E9:72"/>
<font color="Maroon">Z</font> is <a href="pre_topc.html#V4">closed</a>
 
<b>by </b><i><a class="ref" href="waybel_3.html#D2" target="_self">Def2</a>, <a class="txt" href="waybel_3.html#E1:72"><i><font color="Green">E34</font></i></a>, <a class="ref" href="compts_1.html#T16">COMPTS_1:16</a></i>;<br/>
<a NAME="E10:72"/><b>then </b>
(  <a href="pre_topc.html#K4">Cl</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">Z</font> &amp;  <a href="pre_topc.html#K4">Cl</a> <font color="Maroon">X</font> is <a href="pre_topc.html#V4">closed</a> )
 
<b>by </b><i><a class="txt" href="waybel_3.html#E1:72"><i><font color="Green">E34</font></i></a>, <a class="ref" href="tops_1.html#T31">TOPS_1:31</a></i>;<br/>
<b>hence </b><a NAME="E11:72"/>
(  <a href="pre_topc.html#K4">Cl</a> <font color="Maroon">X</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">y</font> &amp;  <a href="pre_topc.html#K4">Cl</a> <font color="Maroon">X</font> is <a href="compts_1.html#V6">compact</a> )
 <b>by </b><i><a class="txt" href="waybel_3.html#E1:72"><i><font color="Green">E34</font></i></a>, <a class="ref" href="compts_1.html#T18">COMPTS_1:18</a>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>


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