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<b>let </b><font color="Maroon">Omega</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<b>set </b><font color="Maroon">Y</font> =  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font>;<br/>
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(  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> <a href="tarski.html#R1">c=</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> &amp; ( for <font color="Olive">BSeq</font> being  <a href="prob_1.html#NM2">SetSequence</a> of <font color="Maroon">Omega</font>  st ( for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Olive">BSeq</font> <a href="prob_1.html#K1" target="_self">.</a> <font color="Olive">n</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> ) holds <br/> <a href="prob_1.html#K4" target="_self">Intersection</a> <font color="Olive">BSeq</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> ) &amp; ( for <font color="Olive">E</font> being  <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">Omega</font>  st <font color="Olive">E</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> holds <br/><font color="Olive">E</font> <a href="subset_1.html#K3">`</a>  <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> ) )
 
;<br/>
<b>hence </b><a NAME="E2:66"/>
 <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">Omega</font> is   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">Omega</font>
 <b>by </b><i>, </i>;<br/>


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