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<b>consider </b><font color="Maroon">f</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E2:164_1"/><i><font color="Green">E24</font></i>: 
 <a href="relat_1.html#K1">dom</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>1</sub></font>()
 <b>and </b><br/><a NAME="E3:164_1"/><i><font color="Green">E25</font></i>: 
for <font color="Olive">d</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() holds  <font color="Maroon">f</font> <a href="funct_1.html#K1">.</a> <font color="Olive">d</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>(<font color="Olive">d</font>)
 <b>from </b><i><a class="ref" href="funct_1.html#S4">FUNCT_1:sch 4</a>();<br/></i>
<a NAME="E4:164_1"/>
<font color="Maroon">f</font> is    <a href="pboole.html#M1" target="_self">ManySortedSet</a> of <font color="Maroon">F<sub>1</sub></font>()
 
<b>by </b><i><a class="ref" href="pboole.html#T37" target="_self">Th37</a>, </i>;<br/>
<b>hence </b><a NAME="E5:164_1"/>
 ex <font color="Olive">X</font> being   <a href="pboole.html#M1" target="_self">ManySortedSet</a> of <font color="Maroon">F<sub>1</sub></font>() st <br/>for <font color="Olive">d</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() holds  <font color="Olive">X</font> <a href="funct_1.html#K1">.</a> <font color="Olive">d</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>2</sub></font>(<font color="Olive">d</font>)
 <b>by </b><i><a class="ref" href="pboole.html#T38" target="_self">Th38</a></i>;<br/>


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