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<b>let </b><font color="Maroon">T</font> be  <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/>

<a NAME="E1:14"/>
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">T</font> is <a href="compts_1.html#V6">compact</a>
 
<b>by </b><i><a class="ref" href="compts_1.html#T9">COMPTS_1:9</a></i>;<br/>
<a NAME="E2:14"/><b>then </b>
 <a href="pre_topc.html#K2">[#]</a> <font color="Maroon">T</font> is <a href="compts_1.html#V6">compact</a>
 
;<br/>
<b>hence </b><a NAME="E3:14"/>
<font color="Maroon">T</font> is <a href="compts_1.html#V2">compact</a>
 <b>by </b><i><a class="ref" href="compts_1.html#T10">COMPTS_1:10</a></i>;<br/>


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