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<a NAME="E1:28_1_1"/>
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">E</font></span><a href="tarski.html#K1">}</a></span> <a href="tarski.html#R1">c=</a>  <a href="zfmisc_1.html#K1">bool</a> <font color="Maroon">E</font>
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T80">ZFMISC_1:80</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">sE</font> = <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Maroon">E</font></span><a href="tarski.html#K1">}</a></span> as   <a href="setfam_1.html#NM1">Subset-Family</a> of <font color="Maroon">E</font> ;<br/>
<b>take </b>
<font color="Maroon">sE</font>
;<br/>

<b>thus </b><a NAME="E3:28_1_1"/>
( not <font color="Maroon">sE</font> is <a href="xboole_0.html#V1">empty</a> &amp; <font color="Maroon">sE</font> is <a href="finset_1.html#V1">finite</a> )
 ;<br/>

<a NAME="E4:28_1_1"/>
 <a href="setfam_1.html#K5">union</a> <font color="Maroon">sE</font> <a href="hidden.html#R1">=</a> <font color="Maroon">E</font>
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T31">ZFMISC_1:31</a></i>;<br/>
<b>hence </b><a NAME="E5:28_1_1"/>
<font color="Maroon">sE</font> is <a href="abian.html#V2" target="_self">covering</a>
 <b>by </b><i/>;<br/>


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