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<b>let </b><font color="Maroon">Y</font> be  non <a href="struct_0.html#V3">empty</a>  <a href="pre_topc.html#L1">TopStruct</a> ;<br/><b>let </b><font color="Maroon">x</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">Y</font>;<br/>



<a NAME="E1:26"/>
( <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span> <a href="hidden.html#R1">=</a>  <a href="setfam_1.html#K6">meet</a> <span class="p1">(<span class="default"><a href="tex_4.html#K1" target="_self">MaxADSF</a> <font color="Maroon">x</font></span>)</span> &amp;  <a href="setfam_1.html#K6">meet</a> <span class="p1">(<span class="default"><a href="tex_4.html#K1" target="_self">MaxADSF</a> <font color="Maroon">x</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="setfam_1.html#K5">union</a> <span class="p1">(<span class="default"><a href="tex_4.html#K1" target="_self">MaxADSF</a> <font color="Maroon">x</font></span>)</span> )
 
<b>by </b><i><a class="ref" href="tex_4.html#T1" target="_self">Th1</a>, <a class="ref" href="setfam_1.html#T3">SETFAM_1:3</a></i>;<br/>
<b>hence </b><a NAME="E2:26"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a>  <a href="setfam_1.html#K5">union</a> <span class="p1">(<span class="default"><a href="tex_4.html#K1" target="_self">MaxADSF</a> <font color="Maroon">x</font></span>)</span>
 ;<br/>


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