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<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="waybel23.html#M1" target="_self">CLbasis</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>assume </b><a NAME="E1:71_1_1"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

 <a href="yellow_0.html#K4">Top</a> <font color="Maroon">c<sub>1</sub></font> = 
 <a href="yellow_0.html#K1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="waybel_3.html#K1">waybelow</a> <span class="p3">(<span class="default"><a href="yellow_0.html#K4">Top</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span>)</span> <a href="subset_1.html#K9">/\</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>,<font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="ref" href="waybel23.html#D7" target="_self">Def7</a></i>
<br/>.= 
 <a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="txt" href="waybel23.html#E1:71_1_1"><i><font color="Green">E35</font></i></a></i>
;<br/>
<b>hence </b><a NAME="E3:71_1_1"/>
contradiction
 <b>by </b><i><a class="ref" href="waybel_7.html#T5">WAYBEL_7:5</a></i>;<br/>


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