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

<a NAME="E1:41"/>
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">T</font> <a href="tarski.html#R1">c=</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">T</font>
 
;<br/>
<b>hence </b><a NAME="E2:41"/>
 <a href="xboole_0.html#K1">{}</a>  is  <a href="xboole_0.html#V1">empty</a> <a href="compts_1.html#V6">compact</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>
 ;<br/>


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