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<b>let </b><font color="Maroon" title="c1">T</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>  <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a> ;<br/>

<b>set </b><font color="Maroon" title="c2">X</font> = <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b1">x</font>,<font color="Maroon" title="c1">T</font></span>)</span> where <font color="Olive" title="b1">x</font> is   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> : verum </span>}</span> ;<br/>
<b>let </b><font color="Maroon" title="c3">x</font> be   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font>;<br/>

<a NAME="E1:8"/>
(  <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c1">T</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b1">x</font>,<font color="Maroon" title="c1">T</font></span>)</span> where <font color="Olive" title="b1">x</font> is   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> : verum </span>}</span>  &amp;  <a href="topgen_2.html#K2" title="TOPGEN_2:func.2">Chi</a> <font color="Maroon" title="c1">T</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="tarski.html#K3" title="TARSKI:func.3">union</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b1">x</font>,<font color="Maroon" title="c1">T</font></span>)</span> where <font color="Olive" title="b1">x</font> is   <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> : verum </span>}</span>  )
 
<b>by </b><i><a class="ref" href="topgen_2.html#T4" target="_self" title="TOPGEN_2:th.4">Th4</a></i>;<br/>
<b>hence </b><a NAME="E2:8"/>
 <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Maroon" title="c3">x</font>,<font color="Maroon" title="c1">T</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a>  <a href="topgen_2.html#K2" title="TOPGEN_2:func.2">Chi</a> <font color="Maroon" title="c1">T</font>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T92" title="ZFMISC_1:th.92">ZFMISC_1:92</a></i>;<br/>


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