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<b>assume </b><a NAME="E1:65"/>
 <a href="kurato_1.html#K6" target="_self">KurExSet</a>  <a href="hidden.html#R1">=</a> <a href="kurato_1.html#K6" target="_self">KurExSet</a>  <a href="subset_1.html#K3">`</a> 
 ;<br/>

<a NAME="E2:65"/><b>then </b>
 <a href="kurato_1.html#K6" target="_self">KurExSet</a>  <a href="xboole_0.html#NR5" target="_self">meets</a> <a href="kurato_1.html#K6" target="_self">KurExSet</a>  <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i><a class="ref" href="xboole_1.html#T66">XBOOLE_1:66</a></i>;<br/>
<b>hence </b><a NAME="E3:65"/>
contradiction
 <b>by </b><i><a class="ref" href="xboole_1.html#T79">XBOOLE_1:79</a></i>;<br/>


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