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<b>let </b><font color="Maroon">f</font> be  <a href="cohsp_1.html#V8" target="_self">U-continuous</a> <a href="funct_1.html#NM1">Function</a>;<br/>

<b>assume </b><a NAME="E1:59"/><i><font color="Green">E26</font></i>: 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> is <a href="classes1.html#V1">subset-closed</a>
 ;<br/>

<b>let </b><font color="Maroon">a</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E2:59"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">C</font> =  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> as  non <a href="xboole_0.html#V1">empty</a> <a href="classes1.html#V1">subset-closed</a> <a href="cohsp_1.html#V3" target="_self">d.union-closed</a>  <a href="hidden.html#M1">set</a>  <b>by </b><i><a class="txt" href="cohsp_1.html#E2:59"><i><font color="Green">E27</font></i></a></i>;<br/>
<b>reconsider </b><font color="Maroon">a</font> = <font color="Maroon">a</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">C</font> <b>by </b><i><a class="ref" href="cohsp_1.html#D3" target="_self">Def3</a></i>;<br/>
<a NAME="E5:59"/>
<font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><a href="cohsp_1.html#K4" target="_self">union</a> <span class="p2">(<span class="default"><a href="cohsp_1.html#K3" target="_self">Fin</a> <font color="Maroon">a</font></span>)</span></span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E6:59"/>
<font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">a</font> <a href="hidden.html#R1">=</a>  <a href="tarski.html#K3">union</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="relat_1.html#K9">.:</a> <span class="p2">(<span class="default"><a href="finsub_1.html#K5">Fin</a> <font color="Maroon">a</font></span>)</span></span>)</span>
 <b>by </b><i/>;<br/>


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