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<b>let </b><font color="Maroon">X</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">X0</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>;<br/>



<b>assume </b><a NAME="E1:124"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">X0</font> is  <a href="tsep_1.html#V1">open</a>  <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font>
 ;<br/>

<b>reconsider </b><font color="Maroon">A</font> = the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">X0</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">X</font> <b>by </b><i><a class="ref" href="tsep_1.html#T1">TSEP_1:1</a></i>;<br/>
<a NAME="E3:124"/>
<font color="Maroon">A</font> is <a href="pre_topc.html#V3">open</a>
 
<b>by </b><i><a class="ref" href="tmap_1.html#T19" target="_self">Th19</a>, <a class="ref" href="tsep_1.html#T16">TSEP_1:16</a></i>;<br/>
<a NAME="E4:124"/><b>then </b>
(  <a href="tmap_1.html#K7" target="_self">modid</a> <font color="Maroon">X</font>,<font color="Maroon">A</font> <a href="funct_2.html#R1">=</a>  <a href="grcat_1.html#K7">id</a> <font color="Maroon">X</font> &amp;  <a href="tmap_1.html#K7" target="_self">modid</a> <font color="Maroon">X</font>,<font color="Maroon">A</font> <a href="funct_2.html#R1">=</a>  <a href="tmap_1.html#K9" target="_self">modid</a> <font color="Maroon">X</font>,<font color="Maroon">X0</font> )
 
<b>by </b><i>, <a class="ref" href="tmap_1.html#T15" target="_self">Th15</a></i>;<br/>
<b>hence </b><a NAME="E5:124"/>
 <a href="tmap_1.html#K9" target="_self">modid</a> <font color="Maroon">X</font>,<font color="Maroon">X0</font> <a href="funct_2.html#R1">=</a>  <a href="grcat_1.html#K7">id</a> <font color="Maroon">X</font>
 ;<br/>


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