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<b>take </b>
<span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span>
;<br/>

<a NAME="E1:11_2_1"/>
for <font color="Olive">b<sub>1</sub></font> being   <a href="hidden.html#M1">set</a>  holds not <span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><font color="Olive">b<sub>1</sub></font></span><a href="tarski.html#K1">}</a></span>
 
<b>by </b><i><a class="ref" href="zfmisc_1.html#T9">ZFMISC_1:9</a></i>;<br/>
<b>hence </b><a NAME="E2:11_2_1"/>
( not <span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span> is <a href="realset1.html#V1" target="_self">trivial</a> &amp; not <span class="p1"><a href="tarski.html#K2">{</a><span class="default">0,1</span><a href="tarski.html#K2">}</a></span> is <a href="xboole_0.html#V1">empty</a> )
 <b>by </b><i><a class="ref" href="realset1.html#D4" target="_self">Def4</a></i>;<br/>


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