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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/>



<span class="p1">(<span class="default"><a href="prob_1.html#K4">Intersection</a> <span class="p2">(<span class="default"><a href="prob_1.html#K3">Complement</a> <font color="Maroon">A1</font></span>)</span></span>)</span> <a href="subset_1.html#K3">`</a>  = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="kurato_2.html#K1">Union</a> <span class="p3">(<span class="default"><a href="prob_1.html#K3">Complement</a> <span class="p4">(<span class="default"><a href="prob_1.html#K3">Complement</a> <font color="Maroon">A1</font></span>)</span></span>)</span></span>)</span> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="subset_1.html#K3">`</a> 
<b>by </b><i><a class="ref" href="prob_1.html#D5">PROB_1:def 5</a></i>
<br/>.= 
 <a href="kurato_2.html#K1">Union</a> <font color="Maroon">A1</font>

;<br/>
<b>hence </b><a NAME="E2:40"/>
 <a href="kurato_2.html#K1">Union</a> <font color="Maroon">A1</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="prob_1.html#K4">Intersection</a> <span class="p2">(<span class="default"><a href="prob_1.html#K3">Complement</a> <font color="Maroon">A1</font></span>)</span></span>)</span> <a href="subset_1.html#K3">`</a> 
 ;<br/>


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