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<b>consider </b><font color="Maroon">f</font> being   <a href="funct_1.html#NM1">Function</a>, <font color="Maroon">I</font> being    <a href="hidden.html#M1">set</a> ;<br/>
<a NAME="E2:86_1_1"/><i><font color="Green">E12</font></i>: 
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">I</font> <a href="funcop_1.html#K2" target="_self">--&gt;</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">I</font>
 
<b>by </b><i/>;<br/>
<b>take </b><font color="Maroon">F</font> = <font color="Maroon">I</font> <a href="funcop_1.html#K2" target="_self">--&gt;</a> <font color="Maroon">f</font>;<br/>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="funcop_1.html#D6" target="_self">FUNCOP_1:def 6</a><br/>

<b>assume </b><a NAME="E3:86_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">F</font>
 ;<br/>

<b>hence </b><a NAME="E4:86_1_1"/>
<font color="Maroon">F</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">x</font> is   <a href="funct_1.html#NM1">Function</a>
 <b>by </b><i>, </i>;<br/>


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