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<b>reconsider </b><font color="Maroon">B</font> =  <a href="xboole_0.html#K1">{}</a>  as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">Omega</font> <b>by </b><i><a class="ref" href="xboole_1.html#T2">XBOOLE_1:2</a></i>;<br/>
<b>take </b>
<font color="Maroon">B</font>
;<br/>

<b>take </b><font color="Maroon">A</font> =  <a href="xboole_0.html#K1">{}</a> ;<br/>

<b>thus </b><a NAME="E2:33_1_1"/>
<font color="Maroon">A</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Sigma</font>
 <b>by </b><i><a class="ref" href="prob_1.html#T42">PROB_1:42</a></i>;<br/>

<b>thus </b><a NAME="E3:33_1_1"/>
<font color="Maroon">B</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font>
 ;<br/>

<b>thus </b><a NAME="E4:33_1_1"/>
<font color="Maroon">P</font> <a href="funct_1.html#K1">.</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> 0
 <b>by </b><i><a class="ref" href="prob_1.html#T64">PROB_1:64</a></i>;<br/>


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