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

<a NAME="E1:5"/><i><font color="Green">E23</font></i>: 
for <font color="Olive">A</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">A</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font> holds <br/><font color="Maroon">X</font> <a href="subset_1.html#K6">\</a> <font color="Olive">A</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font>
 
;<br/>
<a NAME="E2:5"/><i><font color="Green">E24</font></i>: 
for <font color="Olive">M</font> being  <a href="measure1.html#NM3">N_Sub_set_fam</a> of <font color="Maroon">X</font>  st <font color="Olive">M</font> <a href="tarski.html#R1">c=</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font> holds <br/> <a href="setfam_1.html#K5">union</a> <font color="Olive">M</font> <a href="hidden.html#R2">in</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font>
 
;<br/>
<b>reconsider </b><font color="Maroon">Y</font> =  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font> as   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">X</font> <b>by </b><i><a class="ref" href="zfmisc_1.html#D1">ZFMISC_1:def 1</a></i>;<br/>
<a NAME="E4:5"/>
<font color="Maroon">Y</font> is <a href="measure1.html#V2">sigma-additive</a>
 
<b>by </b><i><a class="ref" href="measure1.html#D9">MEASURE1:def 9</a>, </i>;<br/>
<b>then reconsider </b><font color="Maroon">Y</font> = <font color="Maroon">Y</font> as  non <a href="xboole_0.html#V1">empty</a> <a href="prob_1.html#V1">compl-closed</a> <a href="measure1.html#V2">sigma-additive</a> <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">X</font> <b>by </b><i>, <a class="ref" href="measure1.html#D3">MEASURE1:def 3</a></i>;<br/>
<a NAME="E6:5"/>
<font color="Maroon">Y</font> is   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>
 
;<br/>
<b>hence </b><a NAME="E7:5"/>
 <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">X</font> is   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>
 ;<br/>


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