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<a NAME="E1:43_1"/><i><font color="Green">E18</font></i>: 
for <font color="Olive">t</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>()  st <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>3</sub></font>() holds <br/> ex <font color="Olive">ff</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>2</sub></font>() st <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">t</font>,<font color="Olive">ff</font>]
 
<b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">ff</font> being   <a href="funct_2.html#NM1">Function</a> of <font color="Maroon">F<sub>1</sub></font>(),<font color="Maroon">F<sub>2</sub></font>()<b> such that </b><br/><a NAME="E3:43_1"/><i><font color="Green">E19</font></i>: 
for <font color="Olive">t</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>()  st <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>3</sub></font>() holds <br/><font color="Maroon">P<sub>1</sub></font>[<font color="Olive">t</font>,<font color="Maroon">ff</font> <a href="funct_2.html#K3">.</a> <font color="Olive">t</font>]
 <b>from </b><i><a class="ref" href="fraenkel.html#S26" target="_self">FRAENKEL:sch 26</a>();<br/></i>
<b>reconsider </b><font color="Maroon">ff</font> = <font color="Maroon">ff</font> as    <a href="fraenkel.html#M2" target="_self">Element</a> of  <a href="fraenkel.html#K1" target="_self">Funcs</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="funct_2.html#T11">FUNCT_2:11</a></i>;<br/>
<b>take </b>
<font color="Maroon">ff</font>
;<br/>

<b>thus </b><a NAME="E5:43_1"/>
for <font color="Olive">t</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>()  st <font color="Olive">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F<sub>3</sub></font>() holds <br/><font color="Maroon">P<sub>1</sub></font>[<font color="Olive">t</font>,<font color="Maroon">ff</font> <a href="funct_2.html#K3">.</a> <font color="Olive">t</font>]
 <b>by </b><i/>;<br/>


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