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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  <a href="margrel1.html#V2" target="_self">boolean</a>  <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:34"/>
<font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="margrel1.html#K6" target="_self">BOOLEAN</a> 
 
<b>by </b><i><a class="ref" href="margrel1.html#D15" target="_self">Def15</a></i>;<br/>
<b>hence </b><a NAME="E2:34"/>
( <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K7" target="_self">FALSE</a>  or <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a>  <a href="margrel1.html#K8" target="_self">TRUE</a>  )
 <b>by </b><i><a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/>


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