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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">S</font> be   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">M</font> be    <a href="measure1.html#M3" target="_self">sigma_Measure</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">A</font> be    <a href="subset_1.html#M2">Element</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">B</font> be    <a href="measure1.html#M4" target="_self">measure_zero</a> of <font color="Maroon">M</font>;<br/>









<b>assume </b><a NAME="E1:68"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">B</font>
 ;<br/>

<a NAME="E2:68"/>
<font color="Maroon">M</font> is <a href="supinf_2.html#V6">nonnegative</a>
 
<b>by </b><i/>;<br/>
<a NAME="E3:68"/><b>then </b>
(  <a href="supinf_2.html#K1">0.</a>  <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">A</font> &amp; <font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">A</font> <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">B</font> )
 
<b>by </b><i>, , </i>;<br/>
<a NAME="E4:68"/><b>then </b>
(  <a href="supinf_2.html#K1">0.</a>  <a href="xxreal_0.html#R1">&lt;=</a> <font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">A</font> &amp; <font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">A</font> <a href="xxreal_0.html#R1">&lt;=</a>  <a href="supinf_2.html#K1">0.</a>  )
 
<b>by </b><i/>;<br/>
<a NAME="E5:68"/><b>then </b>
<font color="Maroon">M</font> <a href="measure1.html#K1" target="_self">.</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a>  <a href="supinf_2.html#K1">0.</a> 
 
<b>by </b><i><a class="ref" href="xxreal_0.html#T1">XXREAL_0:1</a></i>;<br/>
<b>hence </b><a NAME="E6:68"/>
<font color="Maroon">A</font> is    <a href="measure1.html#M4" target="_self">measure_zero</a> of <font color="Maroon">M</font>
 <b>by </b><i/>;<br/>


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