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<b>let </b><font color="Maroon">T</font> be    <a href="pre_topc.html#L1">TopStruct</a> ;<br/><b>let </b><font color="Maroon">Q</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>;<br/><b>let </b><font color="Maroon">M</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>;<br/><b>let </b><font color="Maroon">F</font> be   <a href="struct_0.html#NM3">Subset-Family</a> of <font color="Maroon">T</font>;<br/>







<b>reconsider </b><font color="Maroon">QQ</font> = <font color="Maroon">Q</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">M</font> as   <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><font color="Maroon">T</font> <a href="pre_topc.html#K3">|</a> <font color="Maroon">M</font></span>)</span> <b>by </b><i/>;<br/>
<b>assume </b><a NAME="E2:33"/>
<font color="Maroon">Q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font>
 ;<br/>

<a NAME="E3:33"/><b>then </b>
( <font color="Maroon">Q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font> &amp; <font color="Maroon">Q</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">M</font> <a href="hidden.html#R1">=</a> <font color="Maroon">QQ</font> )
 
;<br/>
<b>hence </b><a NAME="E4:33"/>
<font color="Maroon">Q</font> <a href="subset_1.html#K9">/\</a> <font color="Maroon">M</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font> <a href="tops_2.html#K1" target="_self">|</a> <font color="Maroon">M</font>
 <b>by </b><i/>;<br/>


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