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<b>consider </b><font color="Maroon">R</font> being   <a href="relat_1.html#NM1">Relation</a>;<br/>
<b>set </b><font color="Maroon">f</font> = <font color="Maroon">I</font> <a href="pboole.html#K9">--&gt;</a> <font color="Maroon">R</font>;<br/>
<a NAME="E2:2_1_1"/><i><font color="Green">E28</font></i>: 
(  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="pboole.html#K9">--&gt;</a> <font color="Maroon">R</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">I</font> &amp; ( for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">I</font> holds <br/><span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="pboole.html#K9">--&gt;</a> <font color="Maroon">R</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Olive">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">R</font> ) )
 
<b>by </b><i><a class="ref" href="funcop_1.html#T13">FUNCOP_1:13</a>, <a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>;<br/>
<b>reconsider </b><font color="Maroon">f</font> = <font color="Maroon">I</font> <a href="pboole.html#K9">--&gt;</a> <font color="Maroon">R</font> as    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font> <b>by </b><i>, <a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>
<b>take </b>
<font color="Maroon">f</font>
;<br/>

<a NAME="E4:2_1_1"/>
for <font color="Olive">x</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> holds <br/><font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Olive">x</font> is   <a href="relat_1.html#NM1">Relation</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:2_1_1"/>
<font color="Maroon">f</font> is <a href="msualg_4.html#V1" target="_self">Relation-yielding</a>
 <b>by </b><i/>;<br/>


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