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<b>let </b><font color="Maroon">X</font> be  <a href="pre_topc.html#V1">strict</a>  <a href="pre_topc.html#L1">TopStruct</a> ;<br/>

<b>reconsider </b><font color="Maroon">X0</font> = <font color="Maroon">X</font> as    <a href="pre_topc.html#M1">SubSpace</a> of <font color="Maroon">X</font> <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">P</font> =  <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">X0</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">X</font> ;<br/>
<a NAME="E3:6"/>
<font color="Maroon">X</font> <a href="pre_topc.html#K3">|</a> <font color="Maroon">P</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X0</font>
 
<b>by </b><i><a class="ref" href="pre_topc.html#D10">PRE_TOPC:def 10</a></i>;<br/>
<b>hence </b><a NAME="E4:6"/>
<font color="Maroon">X</font> <a href="pre_topc.html#K3">|</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K2">[#]</a> <font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font>
 ;<br/>


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