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<b>let </b><font color="Maroon">GX</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">B</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">GX</font>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">GX</font>;<br/>





<b>assume </b><a NAME="E1:33"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <font color="Maroon">B</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">B'</font> = <font color="Maroon">B</font> as  non <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">GX</font> ;<br/>
<b>reconsider </b><font color="Maroon">q</font> = <font color="Maroon">p</font> as   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><font color="Maroon">GX</font> <a href="pre_topc.html#K3">|</a> <font color="Maroon">B'</font></span>)</span> <b>by </b><i><a class="txt" href="connsp_3.html#E1:33"><i><font color="Green">E21</font></i></a>, <a class="ref" href="pre_topc.html#T29">PRE_TOPC:29</a></i>;<br/>
<a NAME="E4:33"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a>  <a href="connsp_1.html#K1">Component_of</a> <font color="Maroon">q</font>
 
<b>by </b><i><a class="ref" href="connsp_1.html#T40">CONNSP_1:40</a></i>;<br/>
<b>hence </b><a NAME="E5:33"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="connsp_3.html#K6" target="_self">Component_of</a> <font color="Maroon">p</font>,<font color="Maroon">B</font>
 <b>by </b><i><a class="txt" href="connsp_3.html#E1:33"><i><font color="Green">E21</font></i></a>, </i>;<br/>


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