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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">F</font> be   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">X</font>, <font color="Maroon">G</font> be   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">X</font>;<br/>



<b>assume </b><a NAME="E1:44"/>
 <a href="setfam_1.html#K7" target="_self">COMPLEMENT</a> <font color="Maroon">F</font> <a href="hidden.html#R1">=</a>  <a href="setfam_1.html#K7" target="_self">COMPLEMENT</a> <font color="Maroon">G</font>
 ;<br/>

<b>hence </b><font color="Maroon">F</font> = 
 <a href="setfam_1.html#K7" target="_self">COMPLEMENT</a> <span class="p1">(<span class="default"><a href="setfam_1.html#K7" target="_self">COMPLEMENT</a> <font color="Maroon">G</font></span>)</span>

<br/>.= 
<font color="Maroon">G</font>

;<br/><br/>


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