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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>, <font color="Maroon">c<sub>3</sub></font> be    <a href="fraenkel.html#M2">Element</a> of  <a href="fraenkel.html#K1">Funcs</a> <font color="Maroon">c<sub>1</sub></font>,<a href="margrel1.html#K6">BOOLEAN</a> ;<br/>





<a NAME="E1:43"/><i><font color="Green">E20</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="valuat_1.html#K6">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="bvfunc_1.html#R1">'&lt;'</a> <font color="Maroon">c<sub>2</sub></font>
 
<b>by </b><i><a class="txt" href="bvfunc_9.html#E1"><i><font color="Green">Lemma1</font></i></a></i>;<br/>
<a NAME="E2:43"/>
<font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#R1">'&lt;'</a> <font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#K8">'or'</a> <font color="Maroon">c<sub>3</sub></font>
 
<b>by </b><i><a class="ref" href="bvfunc_9.html#T39" target="_self">Th39</a></i>;<br/>
<b>hence </b><a NAME="E3:43"/>
<font color="Maroon">c<sub>2</sub></font> <a href="valuat_1.html#K6">'&amp;'</a> <font color="Maroon">c<sub>3</sub></font> <a href="bvfunc_1.html#R1">'&lt;'</a> <font color="Maroon">c<sub>2</sub></font> <a href="bvfunc_1.html#K8">'or'</a> <font color="Maroon">c<sub>3</sub></font>
 <b>by </b><i><a class="txt" href="bvfunc_9.html#E1:43"><i><font color="Green">E20</font></i></a>, <a class="ref" href="bvfunc_1.html#T18">BVFUNC_1:18</a></i>;<br/>


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