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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">Si</font> be   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">FSi</font> be    <a href="prob_3.html#M1" target="_self">FinSequence</a> of <font color="Maroon">Si</font>;<br/>





<b>consider </b><font color="Maroon">ASeq</font> being    <a href="prob_1.html#M1">SetSequence</a> of <font color="Maroon">Si</font><b> such that </b><br/><a NAME="E2:58"/><i><font color="Green">E36</font></i>: 
( ( for <font color="Olive">k</font> being  <a href="nat_1.html#NM1">Nat</a>  st <font color="Olive">k</font> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">FSi</font> holds <br/><font color="Maroon">ASeq</font> <a href="funct_1.html#K1">.</a> <font color="Olive">k</font> <a href="hidden.html#R1">=</a> <font color="Maroon">FSi</font> <a href="prob_3.html#K11" target="_self">.</a> <font color="Olive">k</font> ) &amp; ( for <font color="Olive">k</font> being  <a href="nat_1.html#NM1">Nat</a>  st not <font color="Olive">k</font> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">FSi</font> holds <br/><font color="Maroon">ASeq</font> <a href="funct_1.html#K1">.</a> <font color="Olive">k</font> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  ) )
 <b>by </b><i><a class="ref" href="prob_3.html#T1" target="_self">Th1</a></i>;<br/>
<a NAME="E3:58"/>
 <a href="kurato_2.html#K1">Union</a> <font color="Maroon">ASeq</font> <a href="hidden.html#R1">=</a>  <a href="prob_3.html#K8" target="_self">Union</a> <font color="Maroon">FSi</font>
 
<b>by </b><i><a class="ref" href="prob_3.html#T2" target="_self">Th2</a>, </i>;<br/>
<b>hence </b><a NAME="E4:58"/>
 <a href="prob_3.html#K8" target="_self">Union</a> <font color="Maroon">FSi</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Si</font>
 <b>by </b><i><a class="ref" href="prob_1.html#T46">PROB_1:46</a></i>;<br/>


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