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<b>let </b><font color="Maroon">c<sub>1</sub></font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="funct_1.html#NM1">Function</a>;<br/>



<b>assume </b><a NAME="E1:51"/><i><font color="Green">E23</font></i>: 
<font color="Maroon">c<sub>2</sub></font> is <a href="funct_1.html#V2" target="_self">one-to-one</a>
 ;<br/>

<b>assume </b><a NAME="E2:51"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>2</sub></font>
 ;<br/>

<b>hence </b><a NAME="E3:51"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K1" target="_self">.</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2" target="_self">"</a> </span>)</span> <a href="funct_1.html#K1" target="_self">.</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 <b>by </b><i><a class="txt" href="funct_1.html#E1:51"><i><font color="Green">E23</font></i></a>, <a class="ref" href="funct_1.html#T54" target="_self">Th54</a></i>;<br/>

<a NAME="E4:51"/>
(  <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2" target="_self">"</a> </span>)</span> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2" target="_self">"</a> </span>)</span> )
 
<b>by </b><i><a class="txt" href="funct_1.html#E1:51"><i><font color="Green">E23</font></i></a>, <a class="ref" href="funct_1.html#T55" target="_self">Th55</a></i>;<br/>
<b>hence </b><a NAME="E5:51"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#NK3" target="_self">*</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="funct_1.html#K2" target="_self">"</a> </span>)</span></span>)</span> <a href="funct_1.html#K1" target="_self">.</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="txt" href="funct_1.html#E2:51"><i><font color="Green">E24</font></i></a>, <a class="txt" href="funct_1.html#E3:51"><i><font color="Green">E25</font></i></a>, <a class="ref" href="funct_1.html#T23" target="_self">Th23</a></i>;<br/>


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