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<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">C</font> be    <a href="measure4.html#M1" target="_self">C_Measure</a> of <font color="Maroon">X</font>;<br/>



<div><i><font color="Green">E23</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="23_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">A</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="measure4.html#K1" target="_self">sigma_Field</a> <font color="Maroon">C</font>;<br/><b>reconsider </b><font color="Maroon">A'</font> = <font color="Maroon">A</font> as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font> ;<br/><a NAME="E2:23_1"/><i><font color="Green">E24</font></i>: 
<span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="supinf_2.html#K13">.</a> <font color="Maroon">A'</font> <a href="hidden.html#R1">=</a> <font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <font color="Maroon">A'</font>
 <b>by </b><i/>;<br/><a NAME="E3:23_1"/>
<font color="Maroon">C</font> is <a href="supinf_2.html#V6">nonnegative</a>
 <b>by </b><i/>;<br/><b>hence </b><a NAME="E4:23_1"/>
 <a href="supinf_2.html#K1">0.</a>  <a href="xxreal_0.html#R1">&lt;=</a> <span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="measure1.html#K1">.</a> <font color="Maroon">A</font>
 <b>by </b><i><a class="txt" href="measure4.html#E1:23"><i><font color="Green">E23</font></i></a>, <a class="ref" href="measure1.html#D4">MEASURE1:def 4</a></i>;<br/></div><b>end;</b></div>
<a NAME="E2:23"/>
 <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R2">in</a>  <a href="measure4.html#K1" target="_self">sigma_Field</a> <font color="Maroon">C</font>
 
<b>by </b><i><a class="ref" href="prob_1.html#T10">PROB_1:10</a></i>;<br/>
<a NAME="E3:23"/><b>then </b>
<span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="supinf_2.html#K13">.</a> <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">C</font> <a href="supinf_2.html#K13">.</a> <a href="xboole_0.html#K1">{}</a> 
 
<b>by </b><i/>;<br/>
<a NAME="E4:23"/><b>then </b><i><font color="Green">E25</font></i>: 
(  <a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font> is <a href="supinf_2.html#V6">nonnegative</a> &amp; <span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="supinf_2.html#K13">.</a> <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a>  <a href="supinf_2.html#K1">0.</a>  )
 
<b>by </b><i><a class="ref" href="measure4.html#T1" target="_self">Th1</a>, , <a class="ref" href="measure1.html#D4">MEASURE1:def 4</a></i>;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="23_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">A</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="measure4.html#K1" target="_self">sigma_Field</a> <font color="Maroon">C</font>, <font color="Maroon">B</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="measure4.html#K1" target="_self">sigma_Field</a> <font color="Maroon">C</font>;<br/><b>assume </b><a NAME="E1:23_2"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">A</font> <a href="xboole_0.html#R1">misses</a> <font color="Maroon">B</font>
 ;<br/><b>reconsider </b><font color="Maroon">A'</font> = <font color="Maroon">A</font>, <font color="Maroon">B'</font> = <font color="Maroon">B</font> as   <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font> ;<br/><a NAME="E3:23_2"/><i><font color="Green">E32</font></i>: 
( <span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="supinf_2.html#K13">.</a> <font color="Maroon">A'</font> <a href="hidden.html#R1">=</a> <font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <font color="Maroon">A'</font> &amp; <span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="supinf_2.html#K13">.</a> <font color="Maroon">B'</font> <a href="hidden.html#R1">=</a> <font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <font color="Maroon">B'</font> )
 <b>by </b><i/>;<br/><a NAME="E4:23_2"/>
<font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">A'</font> <a href="subset_1.html#K4">\/</a> <font color="Maroon">B'</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <font color="Maroon">A'</font></span>)</span> <a href="supinf_2.html#K2">+</a> <span class="p1">(<span class="default"><font color="Maroon">C</font> <a href="measure1.html#K1">.</a> <font color="Maroon">B'</font></span>)</span>
 <b>by </b><i>, </i>;<br/><b>hence </b><a NAME="E5:23_2"/>
<span class="p1">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="measure1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">A</font> <a href="measure1.html#K2">\/</a> <font color="Maroon">B</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="measure1.html#K1">.</a> <font color="Maroon">A</font></span>)</span> <a href="supinf_2.html#K2">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font></span>)</span> <a href="measure1.html#K1">.</a> <font color="Maroon">B</font></span>)</span>
 <b>by </b><i><a class="txt" href="measure4.html#E4:23"><i><font color="Green">E25</font></i></a>, </i>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E6:23"/>
 <a href="measure4.html#K3" target="_self">sigma_Meas</a> <font color="Maroon">C</font> is    <a href="measure1.html#M1">Measure</a> of  <a href="measure4.html#K1" target="_self">sigma_Field</a> <font color="Maroon">C</font>
 <b>by </b><i><a class="txt" href="measure4.html#E1:23"><i><font color="Green">E23</font></i></a>, <a class="ref" href="measure1.html#D5">MEASURE1:def 5</a></i>;<br/>


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