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<b>let </b><font color="Maroon">SF</font> be   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font>;<br/>

<b>assume </b><a NAME="E1:81_1_1"/><i><font color="Green">E36</font></i>: 
<font color="Maroon">SF</font> is <a href="mssubfam.html#V2" target="_self">absolutely-additive</a>
 ;<br/>

<b>let </b><font color="Maroon">A</font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="mssubfam.html#D3" target="_self">MSSUBFAM:def 3</a><br/><b>let </b><font color="Maroon">B</font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>;<br/>



<b>assume </b><a NAME="E2:81_1_1"/><i><font color="Green">E40</font></i>: 
( <font color="Maroon">A</font> <a href="pboole.html#R1">in</a> <font color="Maroon">SF</font> &amp; <font color="Maroon">B</font> <a href="pboole.html#R1">in</a> <font color="Maroon">SF</font> )
 ;<br/>

<a NAME="E3:81_1_1"/><b>then </b>
( <font color="Maroon">A</font> is    <a href="pboole.html#M4">ManySortedSubset</a> of <font color="Maroon">M</font> &amp; <font color="Maroon">B</font> is    <a href="pboole.html#M4">ManySortedSubset</a> of <font color="Maroon">M</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E4:81_1_1"/><b>then </b>
( <font color="Maroon">A</font> <a href="pboole.html#R2">c=</a> <font color="Maroon">M</font> &amp; <font color="Maroon">B</font> <a href="pboole.html#R2">c=</a> <font color="Maroon">M</font> )
 
<b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>
<a NAME="E5:81_1_1"/><b>then </b><i><font color="Green">E41</font></i>: 
<span class="p1"><a href="pzfmisc1.html#K2">{</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="pzfmisc1.html#K2">}</a></span> is   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font>
 
<b>by </b><i/>;<br/>
<a NAME="E6:81_1_1"/>
( <span class="p1"><a href="pzfmisc1.html#K1">{</a><span class="default"><font color="Maroon">A</font></span><a href="pzfmisc1.html#K1">}</a></span> <a href="pboole.html#R2">c=</a> <font color="Maroon">SF</font> &amp; <span class="p1"><a href="pzfmisc1.html#K1">{</a><span class="default"><font color="Maroon">B</font></span><a href="pzfmisc1.html#K1">}</a></span> <a href="pboole.html#R2">c=</a> <font color="Maroon">SF</font> )
 
<b>by </b><i>, <a class="ref" href="pzfmisc1.html#T36">PZFMISC1:36</a></i>;<br/>
<a NAME="E7:81_1_1"/><b>then </b>
<span class="p1"><a href="pzfmisc1.html#K1">{</a><span class="default"><font color="Maroon">A</font></span><a href="pzfmisc1.html#K1">}</a></span> <a href="pboole.html#K2">\/</a> <span class="p1"><a href="pzfmisc1.html#K1">{</a><span class="default"><font color="Maroon">B</font></span><a href="pzfmisc1.html#K1">}</a></span> <a href="pboole.html#R2">c=</a> <font color="Maroon">SF</font>
 
<b>by </b><i><a class="ref" href="pboole.html#T18">PBOOLE:18</a></i>;<br/>
<a NAME="E8:81_1_1"/><b>then </b>
<span class="p1"><a href="pzfmisc1.html#K2">{</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="pzfmisc1.html#K2">}</a></span> <a href="pboole.html#R2">c=</a> <font color="Maroon">SF</font>
 
<b>by </b><i><a class="ref" href="pzfmisc1.html#T11">PZFMISC1:11</a></i>;<br/>
<a NAME="E9:81_1_1"/><b>then </b>
 <a href="mboolean.html#K2">union</a> <span class="p1"><a href="pzfmisc1.html#K2">{</a><span class="default"><font color="Maroon">A</font>,<font color="Maroon">B</font></span><a href="pzfmisc1.html#K2">}</a></span> <a href="pboole.html#R1">in</a> <font color="Maroon">SF</font>
 
<b>by </b><i>, , </i>;<br/>
<b>hence </b><a NAME="E10:81_1_1"/>
<font color="Maroon">A</font> <a href="pboole.html#K2">\/</a> <font color="Maroon">B</font> <a href="pboole.html#R1">in</a> <font color="Maroon">SF</font>
 <b>by </b><i><a class="ref" href="pzfmisc1.html#T35">PZFMISC1:35</a></i>;<br/>


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