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<div class="add">

<b>let </b><font color="Maroon">Omega</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">f</font> be   <a href="prob_1.html#NM2">SetSequence</a> of <font color="Maroon">Omega</font>;<br/>



<b>assume </b><a NAME="E1:20"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">f</font> is <a href="prob_2.html#V1">disjoint_valued</a>
 ;<br/>

<b>let </b><font color="Maroon">X</font> be   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">Omega</font>;<br/>

<a NAME="E2:20"/>
for <font color="Olive">n</font>, <font color="Olive">m</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>   st <font color="Olive">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> <font color="Olive">m</font> holds <br/><span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Olive">n</font> <a href="xboole_0.html#R1">misses</a> <span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Olive">m</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="20_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/><b>let </b><font color="Maroon">m</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>



<b>assume </b><a NAME="E1:20_1"/>
<font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> <font color="Maroon">m</font>
 ;<br/>

<a NAME="E2:20_1"/><b>then </b>
<font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">n</font> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">m</font>
 
<b>by </b><i>, <a class="ref" href="prob_2.html#D3">PROB_2:def 3</a></i>;<br/>
<a NAME="E3:20_1"/><b>then </b><i><font color="Green">E32</font></i>: 
<font color="Maroon">X</font> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">n</font></span>)</span> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">m</font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T74">XBOOLE_1:74</a></i>;<br/>
<a NAME="E4:20_1"/>
( <span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">n</font></span>)</span> &amp; <span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Maroon">m</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="prob_1.html#K1">.</a> <font color="Maroon">m</font></span>)</span> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:20_1"/>
<span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Maroon">n</font> <a href="xboole_0.html#R1">misses</a> <span class="p1">(<span class="default"><a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font></span>)</span> <a href="prob_1.html#K1">.</a> <font color="Maroon">m</font>
 <b>by </b><i>, <a class="ref" href="xboole_1.html#T74">XBOOLE_1:74</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E3:20"/>
 <a href="dynkin.html#K4" target="_self">seqIntersection</a> <font color="Maroon">X</font>,<font color="Maroon">f</font> is <a href="prob_2.html#V1">disjoint_valued</a>
 <b>by </b><i/>;<br/>


</div>
