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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">A1</font> be   <a href="prob_1.html#NM2">SetSequence</a> of <font color="Maroon">X</font>;<br/>



<b>assume </b><a NAME="E1:17"/>
<font color="Maroon">A1</font> is <a href="funct_1.html#V3">constant</a>
 ;<br/>

<b>then consider </b><font color="Maroon">A</font> being   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font><b> such that </b><br/><a NAME="E3:17"/><i><font color="Green">E28</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">A1</font> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font>
 <b>by </b><i><a class="ref" href="kurato_2.html#D8">KURATO_2:def 8</a></i>;<br/>
<a NAME="E4:17"/>
(  <a href="kurato_2.html#K1">Union</a> <font color="Maroon">A1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font> &amp;  <a href="prob_1.html#K4">Intersection</a> <font color="Maroon">A1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">A</font> )
 
<b>by </b><i>, , </i>;<br/>
<b>hence </b><a NAME="E5:17"/>
 <a href="kurato_2.html#K1">Union</a> <font color="Maroon">A1</font> <a href="hidden.html#R1">=</a>  <a href="prob_1.html#K4">Intersection</a> <font color="Maroon">A1</font>
 ;<br/>


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