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<b>let </b><font color="Maroon">X</font> be   <a href="rltopsp1.html#NM1">LinearTopSpace</a>;<br/><b>let </b><font color="Maroon">E</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">x</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">X</font>;<br/>





<b>assume </b><a NAME="E1:71"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">E</font> is <a href="pre_topc.html#V3">open</a>
 ;<br/>

<a NAME="E2:71"/>
<span class="p1">(<span class="default"><a href="rltopsp1.html#K3" target="_self">transl</a> <font color="Maroon">x</font>,<font color="Maroon">X</font></span>)</span> <a href="relset_1.html#K10">.:</a> <font color="Maroon">E</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> <a href="rusub_4.html#K5">+</a> <font color="Maroon">E</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:71"/>
<font color="Maroon">x</font> <a href="rusub_4.html#K5">+</a> <font color="Maroon">E</font> is <a href="pre_topc.html#V3">open</a>
 <b>by </b><i>, <a class="ref" href="topgrp_1.html#T25">TOPGRP_1:25</a></i>;<br/>


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