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<a NAME="E1:11_1"/><i><font color="Green">E9</font></i>: 
for <font color="Olive">b</font> being   <a href="hidden.html#M1">set</a>   ex <font color="Olive">a</font> being   <a href="hidden.html#M1">set</a>  st <br/>( <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">a</font>] &amp; <font color="Maroon">P<sub>2</sub></font>[<font color="Olive">b</font>] )
 
<b>by </b><i/>;<br/>
<a NAME="E2:11_1"/>
(  ex <font color="Olive">a</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">a</font>] &amp; ( for <font color="Olive">b</font> being   <a href="hidden.html#M1">set</a>  holds  <font color="Maroon">P<sub>2</sub></font>[<font color="Olive">b</font>] ) )
 
<b>from </b><i><a class="ref" href="schems_1.html#S10" target="_self">SCHEMS_1:sch 10</a>();<br/></i>
<b>hence </b><a NAME="E3:11_1"/>
 ex <font color="Olive">a</font> being   <a href="hidden.html#M1">set</a>  st <br/>for <font color="Olive">b</font> being   <a href="hidden.html#M1">set</a>  holds <br/> ( <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">a</font>] &amp; <font color="Maroon">P<sub>2</sub></font>[<font color="Olive">b</font>] )
 ;<br/>


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