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



<b>assume </b><a NAME="E1:16"/>
<font color="Maroon">c<sub>1</sub></font> <a href="finseq_4.html#R1" target="_self">is_one-to-one_at</a> <font color="Maroon">c<sub>2</sub></font>
 ;<br/>

<a NAME="E2:16"/><b>then </b>
( <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K1">dom</a> <font color="Maroon">c<sub>1</sub></font> &amp; <font color="Maroon">c<sub>1</sub></font> <a href="finseq_4.html#R2" target="_self">just_once_values</a> <font color="Maroon">c<sub>1</sub></font> <a href="funct_1.html#K1">.</a> <font color="Maroon">c<sub>2</sub></font> )
 
<b>by </b><i><a class="ref" href="finseq_4.html#T11" target="_self">Th11</a></i>;<br/>
<b>hence </b><a NAME="E3:16"/>
<font color="Maroon">c<sub>1</sub></font> <a href="finseq_4.html#K1" target="_self">&lt;-</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="funct_1.html#K1">.</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="finseq_4.html#D3" target="_self">Def3</a></i>;<br/>


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