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<b>let </b><font color="Maroon">I</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">A</font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>;<br/><b>let </b><font color="Maroon">M</font> be    <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>;<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="E1:60"/>
( <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> )
 ;<br/>

<a NAME="E2:60"/><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> is   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</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> is   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E3:60"/><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> is   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">M</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E4:60"/>
<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><a class="ref" href="pzfmisc1.html#T11">PZFMISC1:11</a></i>;<br/>


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