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<b>let </b><font color="Maroon">A</font> be    <a href="prob_1.html#M2">Event</a> of  <a href="prob_1.html#K14">Borel_Sets</a> ;<br/>

<a NAME="E1:7"/>
<font color="Maroon">A</font> <a href="hidden.html#R2">in</a>  <a href="prob_1.html#K14">Borel_Sets</a> 
 
<b>by </b><i><a class="ref" href="prob_1.html#D10">PROB_1:def 10</a></i>;<br/>
<b>hence </b><a NAME="E2:7"/>
( ( 0 <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> implies <font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> 1 ) &amp; ( not 0 <a href="hidden.html#R2">in</a> <font color="Maroon">A</font> implies <font color="Maroon">P</font> <a href="prob_1.html#K10">.</a> <font color="Maroon">A</font> <a href="hidden.html#R1">=</a> 0 ) )
 <b>by </b><i/>;<br/>


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