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<b>let </b><font color="Maroon">c<sub>1</sub></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">c<sub>2</sub></font> be   <a href="prob_1.html#NM3">SigmaField</a> of <font color="Maroon">c<sub>1</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="prob_1.html#M3" target="_self">Probability</a> of <font color="Maroon">c<sub>2</sub></font>;<br/>





<a NAME="E1:56"/><i><font color="Green">E34</font></i>: 
 <a href="xboole_0.html#K1">{}</a>  <a href="xboole_0.html#R1">misses</a>  <a href="prob_1.html#K5" target="_self">[#]</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T65">XBOOLE_1:65</a></i>;<br/>
<a NAME="E2:56"/><i><font color="Green">E35</font></i>: 
<a href="xboole_0.html#K1">{}</a>  <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><a href="prob_1.html#K5" target="_self">[#]</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="prob_1.html#K5" target="_self">[#]</a> <font color="Maroon">c<sub>2</sub></font>
 
;<br/>
<b>reconsider </b><font color="Maroon">c<sub>4</sub></font> =  <a href="xboole_0.html#K1">{}</a>  as    <a href="prob_1.html#M2" target="_self">Event</a> of <font color="Maroon">c<sub>2</sub></font> <b>by </b><i><a class="ref" href="prob_1.html#T52" target="_self">Th52</a></i>;<br/>
1 = 
<font color="Maroon">c<sub>3</sub></font> <a href="seq_1.html#K2">.</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="prob_1.html#D13" target="_self">Def13</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font> <a href="prob_1.html#K10" target="_self">.</a> <span class="p1">(<span class="default"><a href="prob_1.html#K5" target="_self">[#]</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>

;<br/>
<a NAME="E5:56"/><b>then </b>
1 <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="prob_1.html#K10" target="_self">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="xcmplx_0.html#K2">+</a> 1
 
<b>by </b><i><a class="txt" href="prob_1.html#E1:56"><i><font color="Green">E34</font></i></a>, <a class="txt" href="prob_1.html#E2:56"><i><font color="Green">E35</font></i></a>, <a class="ref" href="prob_1.html#D13" target="_self">Def13</a></i>;<br/>
<b>then </b><font color="Maroon">c<sub>3</sub></font> <a href="seq_1.html#K2">.</a> <span class="p1">(<span class="default"><a href="subset_1.html#K1">{}</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> = 
1 <a href="xcmplx_0.html#K6">-</a> 1

<br/>.= 
0

;<br/>
<b>hence </b><a NAME="E7:56"/>
<font color="Maroon">c<sub>3</sub></font> <a href="seq_1.html#K2">.</a> <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> 0
 ;<br/>


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