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<b>set </b><font color="Maroon">g</font> = <font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font>;<br/>
<a NAME="E1:2_1_1"/><i><font color="Green">E24</font></i>: 
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="funcop_1.html#T19">FUNCOP_1:19</a></i>;<br/>
<a NAME="E2:2_1_1"/>
<font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font> is <a href="funcop_1.html#V1">Function-yielding</a>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="2_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">a</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">FUNCOP_1:def 6</a><br/>

<b>assume </b><a NAME="E1:2_1_1_1"/>
<font color="Maroon">a</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font></span>)</span>
 ;<br/>

<b>hence </b><a NAME="E2:2_1_1_1"/>
<span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">a</font> is   <a href="funct_1.html#NM1">Function</a>
 <b>by </b><i>, <a class="ref" href="funcop_1.html#T13">FUNCOP_1:13</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E3:2_1_1"/>
<font color="Maroon">A</font> <a href="pre_circ.html#K2">--&gt;</a> <font color="Maroon">f</font> is <a href="funcop_1.html#V1">Function-yielding</a>
 ;<br/>


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