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

<b>assume </b><a NAME="E1:49"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="funct_1.html#V2" target="_self">one-to-one</a>
 ;<br/>

<a NAME="E2:49"/><b>then </b>
<font color="Maroon">c<sub>1</sub></font> <a href="funct_1.html#K2" target="_self">"</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>1</sub></font> <a href="relat_1.html#K4">~</a> 
 
<b>by </b><i><a class="ref" href="funct_1.html#D9" target="_self">Def9</a></i>;<br/>
<b>hence </b><a NAME="E3:49"/>
(  <a href="relat_1.html#K2">rng</a> <font color="Maroon">c<sub>1</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>1</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>1</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>1</sub></font> <a href="funct_1.html#K2" target="_self">"</a> </span>)</span> )
 <b>by </b><i><a class="ref" href="relat_1.html#T37">RELAT_1:37</a></i>;<br/>


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