<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">X</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">Si</font> be   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">X</font>;<br/>



<a NAME="E1:43"/>
<font color="Maroon">X</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Si</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:43"/>
<font color="Maroon">X</font> is    <a href="prob_1.html#M2" target="_self">Event</a> of <font color="Maroon">Si</font>
 <b>by </b><i/>;<br/>


</div>
