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<b>consider </b><font color="Maroon">fs</font> being   <a href="subset_1.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="rfunct_3.html#K4">PFuncs</a> <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>()</span>)</span><b> such that </b><br/><a NAME="E2:5_1"/><i><font color="Green">E26</font></i>: 
for <font color="Olive">f</font> being   <a href="hidden.html#M1">set</a>  holds <br/> ( <font color="Olive">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">fs</font> iff ( <font color="Olive">f</font> <a href="hidden.html#R2">in</a>  <a href="rfunct_3.html#K4">PFuncs</a> <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>() &amp; <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">f</font>] ) )
 <b>from </b><i><a class="ref" href="subset_1.html#S1">SUBSET_1:sch 1</a>();<br/></i>
<b>take </b>
<font color="Maroon">fs</font>
;<br/>

<b>let </b><font color="Maroon">pfs</font> be   <a href="partfun1.html#NM1">PartFunc</a> of <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>();<br/>

<a NAME="E3:5_1"/>
<font color="Maroon">pfs</font> <a href="hidden.html#R2">in</a>  <a href="rfunct_3.html#K4">PFuncs</a> <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>()
 
<b>by </b><i><a class="ref" href="partfun1.html#T119">PARTFUN1:119</a></i>;<br/>
<b>hence </b><a NAME="E4:5_1"/>
( <font color="Maroon">pfs</font> <a href="hidden.html#R2">in</a> <font color="Maroon">fs</font> iff <font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">pfs</font>] )
 <b>by </b><i/>;<br/>


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