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<b>let </b><font color="Maroon" title="c1">X</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">F</font> be   <a href="prob_1.html#NM1" title="PROB_1:NM.1">Field_Subset</a> of <font color="Maroon" title="c1">X</font>;<br/>



<b>consider </b><font color="Maroon" title="c3">A</font> being   <a href="subset_1.html#NM2" title="SUBSET_1:NM.2">Subset</a> of <font color="Maroon" title="c1">X</font><b> such that </b><br/><a NAME="E2:9"/><i><font color="Green" title="E8">A1</font></i>: 
<font color="Maroon" title="c3">A</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">F</font>
 <b>by </b><i><a class="ref" href="prob_1.html#T6" target="_self" title="PROB_1:th.6">Th6</a></i>;<br/>
<a NAME="E3:9"/><i><font color="Green" title="E9">A2</font></i>: 
<font color="Maroon" title="c3">A</font> <a href="subset_1.html#K3" title="SUBSET_1:func.3">`</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">F</font>
 
<b>by </b><i><a class="txt" href="prob_1.html#E2:9"><i><font color="Green" title="E8">A1</font></i></a>, <a class="ref" href="prob_1.html#D1" target="_self" title="PROB_1:def.1">Def1</a></i>;<br/>
<font color="Maroon" title="c3">A</font> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <span class="p1">(<span class="default"><font color="Maroon" title="c3">A</font> <a href="subset_1.html#K3" title="SUBSET_1:func.3">`</a> </span>)</span> = 
 <a href="subset_1.html#K2" title="SUBSET_1:func.2">[#]</a> <font color="Maroon" title="c1">X</font>
<b>by </b><i><a class="ref" href="subset_1.html#T25" title="SUBSET_1:th.25">SUBSET_1:25</a></i>
<br/>.= 
<font color="Maroon" title="c1">X</font>

;<br/>
<b>hence </b><a NAME="E5:9"/>
<font color="Maroon" title="c1">X</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">F</font>
 <b>by </b><i><a class="txt" href="prob_1.html#E2:9"><i><font color="Green" title="E8">A1</font></i></a>, <a class="txt" href="prob_1.html#E3:9"><i><font color="Green" title="E9">A2</font></i></a>, <a class="ref" href="prob_1.html#T9" target="_self" title="PROB_1:th.9">Th9</a></i>;<br/>


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