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<b>let </b><font color="Maroon" title="c1">f</font> be   <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a>;<br/><b>let </b><font color="Maroon" title="c2">y</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/>



<b>assume </b><b>that </b><br/><a NAME="E1:15"/><i><font color="Green" title="E13">A1</font></i>: 
<font color="Maroon" title="c1">f</font> is <a href="funct_1.html#V2" title="FUNCT_1:attr.2">one-to-one</a>
 <b>and </b><br/><a NAME="E2:15"/><i><font color="Green" title="E14">A2</font></i>: 
<font color="Maroon" title="c2">y</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K2" title="RELAT_1:func.2">rng</a> <font color="Maroon" title="c1">f</font>
 ;<br/>

<b>consider </b><font color="Maroon" title="c3">x</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> <b> such that </b><br/><a NAME="E4:15"/><i><font color="Green" title="E15">A3</font></i>: 
( <font color="Maroon" title="c3">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#K1" title="RELAT_1:func.1">dom</a> <font color="Maroon" title="c1">f</font> &amp; <font color="Maroon" title="c1">f</font> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c3">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">y</font> )
 <b>by </b><i><a class="txt" href="finseq_4.html#E2:15"><i><font color="Green" title="E14">A2</font></i></a>, <a class="ref" href="funct_1.html#D5" title="FUNCT_1:def.5">FUNCT_1:def 5</a></i>;<br/>
<a NAME="E5:15"/>
<font color="Maroon" title="c1">f</font> <a href="finseq_4.html#R2" title="FINSEQ_4:pred.2">just_once_values</a> <font color="Maroon" title="c2">y</font>
 
<b>by </b><i><a class="txt" href="finseq_4.html#E1:15"><i><font color="Green" title="E13">A1</font></i></a>, <a class="txt" href="finseq_4.html#E2:15"><i><font color="Green" title="E14">A2</font></i></a>, <a class="ref" href="finseq_4.html#T10" target="_self" title="FINSEQ_4:th.10">Th10</a></i>;<br/>
<a NAME="E6:15"/><b>then </b>
<font color="Maroon" title="c3">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">f</font> <a href="finseq_4.html#K1" title="FINSEQ_4:func.1">&lt;-</a> <font color="Maroon" title="c2">y</font>
 
<b>by </b><i><a class="txt" href="finseq_4.html#E4:15"><i><font color="Green" title="E15">A3</font></i></a>, <a class="ref" href="finseq_4.html#D3" target="_self" title="FINSEQ_4:def.3">Def3</a></i>;<br/>
<b>hence </b><a NAME="E7:15"/>
<span class="p1">(<span class="default"><font color="Maroon" title="c1">f</font> <a href="funct_1.html#K2" title="FUNCT_1:func.2">"</a> </span>)</span> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <font color="Maroon" title="c2">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c1">f</font> <a href="finseq_4.html#K1" title="FINSEQ_4:func.1">&lt;-</a> <font color="Maroon" title="c2">y</font>
 <b>by </b><i><a class="txt" href="finseq_4.html#E1:15"><i><font color="Green" title="E13">A1</font></i></a>, <a class="txt" href="finseq_4.html#E4:15"><i><font color="Green" title="E15">A3</font></i></a>, <a class="ref" href="funct_1.html#T54" title="FUNCT_1:th.54">FUNCT_1:54</a></i>;<br/>


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