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<b>let </b><font color="Maroon">f</font> be   <a href="funct_2.html#NM1">Function</a> of 4, <a href="numbers.html#K1">REAL</a> ;<br/>

<b>reconsider </b><font color="Maroon">a</font> = <font color="Maroon">f</font> <a href="seq_1.html#K2">.</a> 0, <font color="Maroon">b</font> = <font color="Maroon">f</font> <a href="seq_1.html#K2">.</a> 1, <font color="Maroon">c</font> = <font color="Maroon">f</font> <a href="seq_1.html#K2">.</a> 2, <font color="Maroon">d</font> = <font color="Maroon">f</font> <a href="seq_1.html#K2">.</a> 3 as    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a>  ;<br/>
<b>take </b>
<font color="Maroon">a</font>
;<br/>

<b>take </b>
<font color="Maroon">b</font>
;<br/>

<b>take </b>
<font color="Maroon">c</font>
;<br/>

<b>take </b>
<font color="Maroon">d</font>
;<br/>

<a NAME="E2:46"/>
 <a href="relset_1.html#K4">dom</a> <font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="enumset1.html#K2">{</a><span class="default">0,1,2,3</span><a href="enumset1.html#K2">}</a></span>
 
<b>by </b><i><a class="ref" href="card_1.html#T90">CARD_1:90</a>, <a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><a NAME="E3:46"/>
<font color="Maroon">f</font> <a href="funct_2.html#R1">=</a> 0,1,2,3 <a href="quaterni.html#K3" target="_self">--&gt;</a> <font color="Maroon">a</font>,<font color="Maroon">b</font>,<font color="Maroon">c</font>,<font color="Maroon">d</font>
 <b>by </b><i/>;<br/>


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