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<b>take </b>
 <a href="msualg_3.html#K2">id</a> <font color="Maroon">V</font>
;<br/>

<b>thus </b><a NAME="E1:41_1_1"/>
 <a href="relat_1.html#K1">dom</a> <span class="p1">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">V</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="numbers.html#K5">NAT</a> 
 <b>by </b><i><a class="ref" href="pboole.html#D3">PBOOLE:def 3</a></i>;<br/>

<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<a NAME="E2:41_1_1"/>
<span class="p1">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">V</font></span>)</span> <a href="msualg_3.html#K1">.</a> <font color="Maroon">n</font> <a href="funct_2.html#R2">=</a>  <a href="partfun1.html#K6">id</a> <span class="p1">(<span class="default"><font color="Maroon">V</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">n</font></span>)</span>
 
<b>by </b><i><a class="ref" href="msualg_3.html#D1">MSUALG_3:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:41_1_1"/>
<span class="p1">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">V</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">n</font> is   <a href="funct_2.html#NM2">Permutation</a> of <font color="Maroon">V</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">n</font>
 ;<br/>


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