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<a NAME="E1:28_1"/><i><font color="Green">E19</font></i>: 
<font color="Maroon">P<sub>1</sub></font>[ <a href="setwiseo.html#K1" target="_self">{}.</a> <font color="Maroon">F<sub>1</sub></font>()]
 
<b>by </b><i><a class="txt" href="setwiseo.html#E1:28"><i><font color="Green">E17</font></i></a></i>;<br/>
<a NAME="E2:28_1"/><i><font color="Green">E20</font></i>: 
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">F<sub>1</sub></font>()<br/>for <font color="Olive">b<sub>2</sub></font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">F<sub>1</sub></font>() st <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font>] &amp; not <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R2">in</a> <font color="Olive">b<sub>1</sub></font> holds <br/><font color="Maroon">P<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font> <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Olive">b<sub>2</sub></font></span><a href="tarski.html#K1">}</a></span>]
 
<b>by </b><i><a class="txt" href="setwiseo.html#E2:28"><i><font color="Green">E18</font></i></a></i>;<br/>
<b>thus </b><a NAME="E3:28_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="subset_1.html#M1">Element</a> of  <a href="finsub_1.html#K5">Fin</a> <font color="Maroon">F<sub>1</sub></font>() holds <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">b<sub>1</sub></font>]
 <b>from </b><i><a class="ref" href="setwiseo.html#S2" target="_self">SETWISEO:sch 2</a>(<a class="txt" href="setwiseo.html#E1:28_1"><i><font color="Green">E19</font></i></a>, <a class="txt" href="setwiseo.html#E2:28_1"><i><font color="Green">E20</font></i></a>);</i><br/>


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