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<b>let </b><font color="Maroon" title="c2">B</font> be    <a href="waybel23.html#M1" title="WAYBEL23:mode.1">CLbasis</a> of <font color="Maroon" title="c1">L</font>;<br/>

<b>assume </b><a NAME="E1:71_1_1"/><i><font color="Green" title="E35">A1</font></i>: 
<font color="Maroon" title="c2">B</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ;<br/>

 <a href="yellow_0.html#K4" title="YELLOW_0:func.4">Top</a> <font color="Maroon" title="c1">L</font> = 
 <a href="yellow_0.html#K1" title="YELLOW_0:func.1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="waybel_3.html#K1" title="WAYBEL_3:func.1">waybelow</a> <span class="p3">(<span class="default"><a href="yellow_0.html#K4" title="YELLOW_0:func.4">Top</a> <font color="Maroon" title="c1">L</font></span>)</span></span>)</span> <a href="subset_1.html#K9" title="SUBSET_1:func.9">/\</a> <font color="Maroon" title="c2">B</font></span>)</span>,<font color="Maroon" title="c1">L</font>
<b>by </b><i><a class="ref" href="waybel23.html#D7" target="_self" title="WAYBEL23:def.7">Def7</a></i>
<br/>.= 
 <a href="yellow_0.html#K3" title="YELLOW_0:func.3">Bottom</a> <font color="Maroon" title="c1">L</font>
<b>by </b><i><a class="txt" href="waybel23.html#E1:71_1_1"><i><font color="Green" title="E35">A1</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" title="WAYBEL_7:th.5">WAYBEL_7:5</a></i>;<br/>


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